Vulnerability-Lookup

ubuntu-cve-2025-40775

Vulnerability from osv_ubuntu

Published

2025-05-21 00:00

Modified

2025-09-08 17:11

Summary

Details

When an incoming DNS protocol message includes a Transaction Signature (TSIG), BIND always checks it. If the TSIG contains an invalid value in the algorithm field, BIND immediately aborts with an assertion failure. This issue affects BIND 9 versions 9.20.0 through 9.20.8 and 9.21.0 through 9.21.7.

Severity

7.5 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2025-40775	REPORT
	https://www.cve.org/CVERecord?id=CVE-2025-40775	REPORT
	https://ubuntu.com/security/notices/USN-7526-1	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "bind9",
            "binary_version": "1:9.20.4-3ubuntu1.1"
          },
          {
            "binary_name": "bind9-dev",
            "binary_version": "1:9.20.4-3ubuntu1.1"
          },
          {
            "binary_name": "bind9-dnsutils",
            "binary_version": "1:9.20.4-3ubuntu1.1"
          },
          {
            "binary_name": "bind9-host",
            "binary_version": "1:9.20.4-3ubuntu1.1"
          },
          {
            "binary_name": "bind9-libs",
            "binary_version": "1:9.20.4-3ubuntu1.1"
          },
          {
            "binary_name": "bind9-utils",
            "binary_version": "1:9.20.4-3ubuntu1.1"
          },
          {
            "binary_name": "bind9utils",
            "binary_version": "1:9.20.4-3ubuntu1.1"
          },
          {
            "binary_name": "dnsutils",
            "binary_version": "1:9.20.4-3ubuntu1.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.04",
        "name": "bind9",
        "purl": "pkg:deb/ubuntu/bind9@1:9.20.4-3ubuntu1.1?arch=source\u0026distro=plucky"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:9.20.4-3ubuntu1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:9.20.0-2ubuntu3",
        "1:9.20.0-2ubuntu4",
        "1:9.20.4-3ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "details": "When an incoming DNS protocol message includes a Transaction Signature (TSIG), BIND always checks it.  If the TSIG contains an invalid value in the algorithm field, BIND immediately aborts with an assertion failure. This issue affects BIND 9 versions 9.20.0 through 9.20.8 and 9.21.0 through 9.21.7.",
  "id": "UBUNTU-CVE-2025-40775",
  "modified": "2025-09-08T17:11:56Z",
  "published": "2025-05-21T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-40775"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-40775"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-7526-1"
    }
  ],
  "related": [
    "USN-7526-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2025-40775"
  ],
  "withdrawn": "2026-01-20T05:33:06Z"
}

CVE-2025-40775 (GCVE-0-2025-40775)

Vulnerability from cvelistv5 – Published: 2025-05-21 12:35 – Updated: 2025-05-23 13:11

Title

DNS message with invalid TSIG causes an assertion failure

Summary

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-232 - Improper Handling of Undefined Values

Assigner

isc

References

3 references

URL	Tags
https://kb.isc.org/docs/cve-2025-40775	vendor-advisory
http://www.openwall.com/lists/oss-security/2025/05/21/1
https://security.netapp.com/advisory/ntap-2025052…

Impacted products

1 product

Vendor	Product	Version
ISC	BIND 9	Affected: 9.20.0 , ≤ 9.20.8 (custom) Affected: 9.21.0 , ≤ 9.21.7 (custom)

Date Public

2025-05-21 00:00

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-40775",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-05-21T13:19:58.662181Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-05-21T13:20:18.795Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2025-05-23T13:11:08.588Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2025/05/21/1"
          },
          {
            "url": "https://security.netapp.com/advisory/ntap-20250523-0001/"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "BIND 9",
          "vendor": "ISC",
          "versions": [
            {
              "lessThanOrEqual": "9.20.8",
              "status": "affected",
              "version": "9.20.0",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "9.21.7",
              "status": "affected",
              "version": "9.21.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "datePublic": "2025-05-21T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "When an incoming DNS protocol message includes a Transaction Signature (TSIG), BIND always checks it.  If the TSIG contains an invalid value in the algorithm field, BIND immediately aborts with an assertion failure.\nThis issue affects BIND 9 versions 9.20.0 through 9.20.8 and 9.21.0 through 9.21.7."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "This flaw was discovered in internal testing. We are not aware of any active exploits."
        }
      ],
      "impacts": [
        {
          "descriptions": [
            {
              "lang": "en",
              "value": "Denial-of-service.  By sending specific messages to the server, an attacker can cause `named` to terminate unexpectedly."
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-232",
              "description": "CWE-232 Improper Handling of Undefined Values",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-21T12:35:01.862Z",
        "orgId": "404fd4d2-a609-4245-b543-2c944a302a22",
        "shortName": "isc"
      },
      "references": [
        {
          "name": "CVE-2025-40775",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://kb.isc.org/docs/cve-2025-40775"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.9 or 9.21.8."
        }
      ],
      "source": {
        "discovery": "INTERNAL"
      },
      "title": "DNS message with invalid TSIG causes an assertion failure",
      "workarounds": [
        {
          "lang": "en",
          "value": "No workarounds known."
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "404fd4d2-a609-4245-b543-2c944a302a22",
    "assignerShortName": "isc",
    "cveId": "CVE-2025-40775",
    "datePublished": "2025-05-21T12:35:01.862Z",
    "dateReserved": "2025-04-16T08:44:49.856Z",
    "dateUpdated": "2025-05-23T13:11:08.588Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

usn-7526-1

Vulnerability from osv_ubuntu

Published

2025-05-21 13:47

Modified

2025-10-13 04:41

Summary

bind9 vulnerability

Details

It was discovered that Bind incorrectly handled certain DNS messages with invalid TSIG. A remote attacker could possibly use this issue to cause Bind to crash, resulting in a denial of service.

References

URL

Type

	https://ubuntu.com/security/notices/USN-7526-1	ADVISORY
	https://ubuntu.com/security/CVE-2025-40775	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2025-40775",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:25.04"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "bind9",
            "binary_version": "1:9.20.4-3ubuntu1.1"
          },
          {
            "binary_name": "bind9-dev",
            "binary_version": "1:9.20.4-3ubuntu1.1"
          },
          {
            "binary_name": "bind9-dnsutils",
            "binary_version": "1:9.20.4-3ubuntu1.1"
          },
          {
            "binary_name": "bind9-host",
            "binary_version": "1:9.20.4-3ubuntu1.1"
          },
          {
            "binary_name": "bind9-libs",
            "binary_version": "1:9.20.4-3ubuntu1.1"
          },
          {
            "binary_name": "bind9-utils",
            "binary_version": "1:9.20.4-3ubuntu1.1"
          },
          {
            "binary_name": "bind9utils",
            "binary_version": "1:9.20.4-3ubuntu1.1"
          },
          {
            "binary_name": "dnsutils",
            "binary_version": "1:9.20.4-3ubuntu1.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.04",
        "name": "bind9",
        "purl": "pkg:deb/ubuntu/bind9@1:9.20.4-3ubuntu1.1?arch=source\u0026distro=plucky"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:9.20.4-3ubuntu1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:9.20.0-2ubuntu3",
        "1:9.20.0-2ubuntu4",
        "1:9.20.4-3ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that Bind incorrectly handled certain DNS messages with\ninvalid TSIG. A remote attacker could possibly use this issue to cause Bind\nto crash, resulting in a denial of service.\n",
  "id": "USN-7526-1",
  "modified": "2025-10-13T04:41:30Z",
  "published": "2025-05-21T13:47:23.101403Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-7526-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-40775"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "bind9 vulnerability",
  "upstream": [
    "UBUNTU-CVE-2025-40775"
  ]
}

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.

Action not permitted

ubuntu-cve-2025-40775

Vulnerability from osv_ubuntu

CVE-2025-40775 (GCVE-0-2025-40775)

usn-7526-1

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature