Vulnerability-Lookup

CVE-2021-3731 (GCVE-0-2021-3731)

Vulnerability from cvelistv5 – Published: 2021-08-23 12:42 – Updated: 2024-08-03 17:01

Title

Improper Restriction of Rendered UI Layers or Frames in ledgersmb/ledgersmb

Summary

LedgerSMB does not sufficiently guard against being wrapped by other sites, making it vulnerable to 'clickjacking'. This allows an attacker to trick a targetted user to execute unintended actions.

Severity

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N

CWE

CWE-1021 - Improper Restriction of Rendered UI Layers or Frames

Assigner

@huntrdev

References

3 references

URL	Tags
https://huntr.dev/bounties/5664331d-f5f8-4412-856…	x_refsource_CONFIRM
https://ledgersmb.org/cve-2021-3731-clickjacking	x_refsource_CONFIRM
https://www.debian.org/security/2021/dsa-4962	vendor-advisoryx_refsource_DEBIAN

Impacted products

1 product

Vendor	Product	Version	CPE status
ledgersmb	ledgersmb/ledgersmb	Unaffected: 1.7.33 Affected: unspecified , < 1.8.18 (custom)	guessed

Show details on NVD website

JSON

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    "redhat_vex": {
      "current_release_date": "2026-03-27T13:46:18+00:00",
      "cve": "CVE-2021-3731",
      "id": "CVE-2021-3731",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "Improper Restriction of Rendered UI Layers or Frames in ledgersmb/ledgersmb",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-3731.json",
      "version": "3"
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  }
}

FKIE_CVE-2021-3731

Vulnerability from fkie_nvd - Published: 2021-08-23 13:15 - Updated: 2026-06-17 04:05

Severity

5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N
4.7 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N

Summary

LedgerSMB does not sufficiently guard against being wrapped by other sites, making it vulnerable to 'clickjacking'. This allows an attacker to trick a targetted user to execute unintended actions.

References

URL	Tags
security@huntr.dev	https://huntr.dev/bounties/5664331d-f5f8-4412-8566-408f8655888a	Third Party Advisory
security@huntr.dev	https://ledgersmb.org/cve-2021-3731-clickjacking	Vendor Advisory
security@huntr.dev	https://www.debian.org/security/2021/dsa-4962	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://huntr.dev/bounties/5664331d-f5f8-4412-8566-408f8655888a	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://ledgersmb.org/cve-2021-3731-clickjacking	Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	https://www.debian.org/security/2021/dsa-4962	Third Party Advisory

Impacted products

Vendor	Product	Version
ledgersmb	ledgersmb	*
ledgersmb	ledgersmb	*
ledgersmb	ledgersmb	*
ledgersmb	ledgersmb	*
ledgersmb	ledgersmb	*
ledgersmb	ledgersmb	*
ledgersmb	ledgersmb	*
ledgersmb	ledgersmb	*
debian	debian_linux	10.0
debian	debian_linux	11.0

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "ledgersmb/ledgersmb",
          "vendor": "ledgersmb",
          "versions": [
            {
              "status": "unaffected",
              "version": "1.7.33"
            },
            {
              "lessThan": "1.8.18",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "security@huntr.dev"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:ledgersmb:ledgersmb:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "84D837D8-9CEB-4DAC-BEF6-CB0D7CBF3730",
              "versionEndIncluding": "1.1.12",
              "versionStartIncluding": "1.1.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:ledgersmb:ledgersmb:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "DAA91816-FE66-4662-A88B-08E45BE54C60",
              "versionEndIncluding": "1.2.26",
              "versionStartIncluding": "1.2.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:ledgersmb:ledgersmb:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "2AD1A858-F378-4C88-AC54-752BC352DA64",
              "versionEndIncluding": "1.3.47",
              "versionStartIncluding": "1.3.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:ledgersmb:ledgersmb:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "A19049A3-4641-418B-AAB6-5D32D1FD6E28",
              "versionEndIncluding": "1.4.42",
              "versionStartIncluding": "1.4.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:ledgersmb:ledgersmb:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "0EA19A56-9AD1-4EA9-B020-1930106FD308",
              "versionEndIncluding": "1.5.30",
              "versionStartIncluding": "1.5.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:ledgersmb:ledgersmb:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "C08AEF10-7BF9-4EEC-B7C1-F233FACEDE7F",
              "versionEndIncluding": "1.6.33",
              "versionStartIncluding": "1.6.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:ledgersmb:ledgersmb:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "720FC128-BEE5-4D7C-86B8-438159E36475",
              "versionEndIncluding": "1.7.32",
              "versionStartIncluding": "1.7.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:ledgersmb:ledgersmb:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D4CE19F9-DE00-481E-AA8D-0EDD0B139E9B",
              "versionEndIncluding": "1.8.17",
              "versionStartIncluding": "1.8.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "07B237A9-69A3-4A9C-9DA0-4E06BD37AE73",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "LedgerSMB does not sufficiently guard against being wrapped by other sites, making it vulnerable to \u0027clickjacking\u0027. This allows an attacker to trick a targetted user to execute unintended actions."
    },
    {
      "lang": "es",
      "value": "LedgerSMB no se protege lo suficiente contra la envoltura de otros sitios, haci\u00e9ndolo vulnerable al \"clickjacking\". Esto permite a un atacante enga\u00f1ar a un usuario objetivo para que ejecute acciones no deseadas."
    }
  ],
  "id": "CVE-2021-3731",
  "lastModified": "2026-06-17T04:05:39.350",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 4.3,
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 8.6,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 4.2,
        "source": "security@huntr.dev",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 4.7,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 1.4,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-08-23T13:15:08.007",
  "references": [
    {
      "source": "security@huntr.dev",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://huntr.dev/bounties/5664331d-f5f8-4412-8566-408f8655888a"
    },
    {
      "source": "security@huntr.dev",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://ledgersmb.org/cve-2021-3731-clickjacking"
    },
    {
      "source": "security@huntr.dev",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.debian.org/security/2021/dsa-4962"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://huntr.dev/bounties/5664331d-f5f8-4412-8566-408f8655888a"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://ledgersmb.org/cve-2021-3731-clickjacking"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.debian.org/security/2021/dsa-4962"
    }
  ],
  "sourceIdentifier": "security@huntr.dev",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1021"
        }
      ],
      "source": "security@huntr.dev",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1021"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

GHSA-VJ43-QMPM-3QQP

Vulnerability from github – Published: 2022-05-24 19:11 – Updated: 2022-05-24 19:11

Details

LedgerSMB does not sufficiently guard against being wrapped by other sites, making it vulnerable to 'clickjacking'. This allows an attacker to trick a targetted user to execute unintended actions.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2021-3731"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1021"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-08-23T13:15:00Z",
    "severity": "MODERATE"
  },
  "details": "LedgerSMB does not sufficiently guard against being wrapped by other sites, making it vulnerable to \u0027clickjacking\u0027. This allows an attacker to trick a targetted user to execute unintended actions.",
  "id": "GHSA-vj43-qmpm-3qqp",
  "modified": "2022-05-24T19:11:54Z",
  "published": "2022-05-24T19:11:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3731"
    },
    {
      "type": "WEB",
      "url": "https://huntr.dev/bounties/5664331d-f5f8-4412-8566-408f8655888a"
    },
    {
      "type": "WEB",
      "url": "https://ledgersmb.org/cve-2021-3731-clickjacking"
    },
    {
      "type": "WEB",
      "url": "https://www.debian.org/security/2021/dsa-4962"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

GSD-2021-3731

Vulnerability from gsd - Updated: 2023-12-13 01:23

Details

LedgerSMB does not sufficiently guard against being wrapped by other sites, making it vulnerable to 'clickjacking'. This allows an attacker to trick a targetted user to execute unintended actions.

Aliases

CVE-2021-3731

Aliases

CVE-2021-3731

JSON

To clipboard

{
  "GSD": {
    "alias": "CVE-2021-3731",
    "description": "LedgerSMB does not sufficiently guard against being wrapped by other sites, making it vulnerable to \u0027clickjacking\u0027. This allows an attacker to trick a targetted user to execute unintended actions.",
    "id": "GSD-2021-3731",
    "references": [
      "https://www.debian.org/security/2021/dsa-4962",
      "https://ubuntu.com/security/CVE-2021-3731"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-3731"
      ],
      "details": "LedgerSMB does not sufficiently guard against being wrapped by other sites, making it vulnerable to \u0027clickjacking\u0027. This allows an attacker to trick a targetted user to execute unintended actions.",
      "id": "GSD-2021-3731",
      "modified": "2023-12-13T01:23:34.694514Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "security@huntr.dev",
        "ID": "CVE-2021-3731",
        "STATE": "PUBLIC",
        "TITLE": "Improper Restriction of Rendered UI Layers or Frames in ledgersmb/ledgersmb"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "ledgersmb/ledgersmb",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "!",
                          "version_value": "1.7.33"
                        },
                        {
                          "version_affected": "\u003c",
                          "version_value": "1.8.18"
                        }
                      ]
                    }
                  }
                ]
              },
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            }
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          }
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        "cvss": {
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          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N",
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              }
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          }
        ]
      },
      "references": {
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          {
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            "url": "https://huntr.dev/bounties/5664331d-f5f8-4412-8566-408f8655888a"
          },
          {
            "name": "https://ledgersmb.org/cve-2021-3731-clickjacking",
            "refsource": "CONFIRM",
            "url": "https://ledgersmb.org/cve-2021-3731-clickjacking"
          },
          {
            "name": "DSA-4962",
            "refsource": "DEBIAN",
            "url": "https://www.debian.org/security/2021/dsa-4962"
          }
        ]
      },
      "source": {
        "advisory": "5664331d-f5f8-4412-8566-408f8655888a",
        "discovery": "EXTERNAL"
      }
    },
    "nvd.nist.gov": {
      "configurations": {
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          {
            "children": [],
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                "vulnerable": true
              },
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              },
              {
                "cpe23Uri": "cpe:2.3:a:ledgersmb:ledgersmb:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndIncluding": "1.4.42",
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                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:a:ledgersmb:ledgersmb:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndIncluding": "1.5.30",
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              },
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                "cpe23Uri": "cpe:2.3:a:ledgersmb:ledgersmb:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndIncluding": "1.6.33",
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                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:a:ledgersmb:ledgersmb:*:*:*:*:*:*:*:*",
                "cpe_name": [],
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                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:a:ledgersmb:ledgersmb:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndIncluding": "1.8.17",
                "versionStartIncluding": "1.8.0",
                "vulnerable": true
              }
            ],
            "operator": "OR"
          },
          {
            "children": [],
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              },
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                "cpe_name": [],
                "vulnerable": true
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            "operator": "OR"
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            }
          ]
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                  "value": "CWE-1021"
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        },
        "references": {
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                "Third Party Advisory"
              ],
              "url": "https://huntr.dev/bounties/5664331d-f5f8-4412-8566-408f8655888a"
            },
            {
              "name": "https://ledgersmb.org/cve-2021-3731-clickjacking",
              "refsource": "CONFIRM",
              "tags": [
                "Vendor Advisory"
              ],
              "url": "https://ledgersmb.org/cve-2021-3731-clickjacking"
            },
            {
              "name": "DSA-4962",
              "refsource": "DEBIAN",
              "tags": [
                "Third Party Advisory"
              ],
              "url": "https://www.debian.org/security/2021/dsa-4962"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 4.3,
            "confidentialityImpact": "NONE",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
            "version": "2.0"
          },
          "exploitabilityScore": 8.6,
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          "obtainAllPrivilege": false,
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          "severity": "MEDIUM",
          "userInteractionRequired": true
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.7,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 1.4
        }
      },
      "lastModifiedDate": "2021-08-27T15:16Z",
      "publishedDate": "2021-08-23T13:15Z"
    }
  }
}

ubuntu-cve-2021-3731

Vulnerability from osv_ubuntu

Published

2021-08-23 13:15

Modified

2025-07-18 16:46

Summary

Details

LedgerSMB does not sufficiently guard against being wrapped by other sites, making it vulnerable to 'clickjacking'. This allows an attacker to trick a targetted user to execute unintended actions.

Severity

5.9 (Medium)


                    
                      CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N

4.7 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2021-3731	REPORT
	https://ledgersmb.org/cve-2021-3731-clickjacking	REPORT
	https://huntr.dev/bounties/5664331d-f5f8-4412-856…	REPORT
	https://ubuntu.com/security/notices/USN-5097-1	ADVISORY
	https://www.cve.org/CVERecord?id=CVE-2021-3731	REPORT
	https://ubuntu.com/security/notices/USN-7647-1	ADVISORY

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{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "ledgersmb",
            "binary_version": "1.3.46-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "ledgersmb",
        "purl": "pkg:deb/ubuntu/ledgersmb@1.3.46-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.3.46-1ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.3.46-1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "ledgersmb",
            "binary_version": "1.4.42+ds-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "ledgersmb",
        "purl": "pkg:deb/ubuntu/ledgersmb@1.4.42+ds-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.4.42+ds-1ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.4.41+ds-1",
        "1.4.42+ds-1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "ledgersmb",
            "binary_version": "1.6.9+ds-1ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "ledgersmb",
        "purl": "pkg:deb/ubuntu/ledgersmb@1.6.9+ds-1ubuntu0.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.6.9+ds-1ubuntu0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.6.9+ds-1"
      ]
    }
  ],
  "aliases": [],
  "details": "LedgerSMB does not sufficiently guard against being wrapped by other sites, making it vulnerable to \u0027clickjacking\u0027. This allows an attacker to trick a targetted user to execute unintended actions.",
  "id": "UBUNTU-CVE-2021-3731",
  "modified": "2025-07-18T16:46:28Z",
  "published": "2021-08-23T13:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3731"
    },
    {
      "type": "REPORT",
      "url": "https://ledgersmb.org/cve-2021-3731-clickjacking"
    },
    {
      "type": "REPORT",
      "url": "https://huntr.dev/bounties/5664331d-f5f8-4412-8566-408f8655888a"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5097-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-3731"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-7647-1"
    }
  ],
  "related": [
    "USN-5097-1",
    "USN-7647-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-3731"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2021-3731 (GCVE-0-2021-3731)

FKIE_CVE-2021-3731

GHSA-VJ43-QMPM-3QQP

GSD-2021-3731

ubuntu-cve-2021-3731

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Related by attack behaviour