Vulnerability-Lookup

GSD-2021-20090

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

Details

A path traversal vulnerability in the web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <= 1.24 could allow unauthenticated remote attackers to bypass authentication.

Aliases

CVE-2021-20090

Aliases

CVE-2021-20090

JSON

To clipboard

{
  "GSD": {
    "alias": "CVE-2021-20090",
    "description": "A path traversal vulnerability in the web interfaces of Buffalo WSR-2533DHPL2 firmware version \u003c= 1.02 and WSR-2533DHP3 firmware version \u003c= 1.24 could allow unauthenticated remote attackers to bypass authentication.",
    "id": "GSD-2021-20090"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-20090"
      ],
      "details": "A path traversal vulnerability in the web interfaces of Buffalo WSR-2533DHPL2 firmware version \u003c= 1.02 and WSR-2533DHP3 firmware version \u003c= 1.24 could allow unauthenticated remote attackers to bypass authentication.",
      "id": "GSD-2021-20090",
      "modified": "2023-12-13T01:23:12.563623Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
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      "dateAdded": "2021-11-03",
      "dueDate": "2021-11-17",
      "product": "Buffalo WSR-2533DHPL2 and WSR-2533DHP3 firmware",
      "requiredAction": "Apply updates per vendor instructions.",
      "shortDescription": "A path traversal vulnerability in Arcadyan firmware could allow unauthenticated remote attackers to bypass authentication. It impacts many routers.",
      "vendorProject": "Arcadyan",
      "vulnerabilityName": "Arcadyan Buffalo Firmware Multiple Versions Path Traversal"
    },
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        "ID": "CVE-2021-20090",
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      },
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                  {
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          },
          {
            "name": "VU#914124",
            "refsource": "CERT-VN",
            "url": "https://www.kb.cert.org/vuls/id/914124"
          },
          {
            "name": "https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/",
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            "url": "https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/"
          }
        ]
      }
    },
    "nvd.nist.gov": {
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        "nodes": [
          {
            "children": [
              {
                "children": [],
                "cpe_match": [
                  {
                    "cpe23Uri": "cpe:2.3:o:buffalo:wsr-2533dhpl2-bk_firmware:*:*:*:*:*:*:*:*",
                    "cpe_name": [],
                    "versionEndIncluding": "1.02",
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                    "cpe_name": [],
                    "versionEndIncluding": "1.24",
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              },
              {
                "children": [],
                "cpe_match": [
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            }
          ]
        },
        "problemtype": {
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              "description": [
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        "references": {
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              "tags": [
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              ],
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            },
            {
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            },
            {
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              "url": "https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 7.5,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
            "version": "2.0"
          },
          "exploitabilityScore": 10.0,
          "impactScore": 6.4,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "HIGH",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 5.9
        }
      },
      "lastModifiedDate": "2023-10-18T01:15Z",
      "publishedDate": "2021-04-29T15:15Z"
    }
  }
}

CVE-2021-20090 (GCVE-0-2021-20090)

Vulnerability from cvelistv5 – Published: 2021-04-29 00:00 – Updated: 2025-10-21 23:25

Summary

Severity

9.8 (Critical)


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

SSVC

Exploitation: active Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-02-06 20:25 UTC

CWE

Path Traversal
CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

tenable mitre root

References

4 references

URL	Tags
https://www.tenable.com/security/research/tra-2021-13
https://www.kb.cert.org/vuls/id/914124	third-party-advisory
https://www.secpod.com/blog/arcadyan-based-router…
https://www.cisa.gov/known-exploited-vulnerabilit…	government-resource

Impacted products

1 product

Vendor	Product	Version
n/a	Buffalo WSR-2533DHPL2, Buffalo WSR-2533DHP3	Affected: WSR-2533DHPL2 <=1.02, WSR-2533DHP3 <= 1.24

Show details on NVD website

JSON

To clipboard

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  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T17:30:07.572Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://www.tenable.com/security/research/tra-2021-13"
          },
          {
            "name": "VU#914124",
            "tags": [
              "third-party-advisory",
              "x_transferred"
            ],
            "url": "https://www.kb.cert.org/vuls/id/914124"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 9.8,
              "baseSeverity": "CRITICAL",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2021-20090",
                "options": [
                  {
                    "Exploitation": "active"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-02-06T20:25:22.891349Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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          },
          {
            "other": {
              "content": {
                "dateAdded": "2021-11-03",
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              },
              "type": "kev"
            }
          }
        ],
        "problemTypes": [
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              {
                "cweId": "CWE-22",
                "description": "CWE-22 Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
                "lang": "en",
                "type": "CWE"
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        ],
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          "dateUpdated": "2025-10-21T23:25:47.628Z",
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          }
        ],
        "timeline": [
          {
            "lang": "en",
            "time": "2021-11-03T00:00:00.000Z",
            "value": "CVE-2021-20090 added to CISA KEV"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Buffalo WSR-2533DHPL2, Buffalo WSR-2533DHP3",
          "vendor": "n/a",
          "versions": [
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              "status": "affected",
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      ],
      "problemTypes": [
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      "providerMetadata": {
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      "references": [
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        },
        {
          "name": "VU#914124",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.kb.cert.org/vuls/id/914124"
        },
        {
          "url": "https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/"
        }
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    }
  },
  "cveMetadata": {
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    "dateReserved": "2020-12-17T00:00:00.000Z",
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    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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.

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.

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GSD-2021-20090

CVE-2021-20090 (GCVE-0-2021-20090)

Tags

Sightings

Nomenclature

Related by attack behaviour