USN-7641-1

It was discovered that Bind incorrectly handled configurations where the stale-answer-client-timeout option is set to 0. A remote attacker could possibly use this issue to cause Bind to crash, resulting in a denial of service.

References

Affected packages

Ubuntu:25.04 / bind9

Package

Name: bind9
Purl: pkg:deb/ubuntu/bind9@1:9.20.4-3ubuntu1.2?arch=source&distro=plucky

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1:9.20.4-3ubuntu1.2

Affected versions

1:9.*

1:9.20.0-2ubuntu3

1:9.20.0-2ubuntu4

1:9.20.4-3ubuntu1

1:9.20.4-3ubuntu1.1

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "1:9.20.4-3ubuntu1.2",
            "binary_name": "bind9"
        },
        {
            "binary_version": "1:9.20.4-3ubuntu1.2",
            "binary_name": "bind9-dev"
        },
        {
            "binary_version": "1:9.20.4-3ubuntu1.2",
            "binary_name": "bind9-dnsutils"
        },
        {
            "binary_version": "1:9.20.4-3ubuntu1.2",
            "binary_name": "bind9-host"
        },
        {
            "binary_version": "1:9.20.4-3ubuntu1.2",
            "binary_name": "bind9-libs"
        },
        {
            "binary_version": "1:9.20.4-3ubuntu1.2",
            "binary_name": "bind9-utils"
        },
        {
            "binary_version": "1:9.20.4-3ubuntu1.2",
            "binary_name": "bind9utils"
        },
        {
            "binary_version": "1:9.20.4-3ubuntu1.2",
            "binary_name": "dnsutils"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7641-1.json"

cves_map

{
    "cves": [
        {
            "id": "CVE-2025-40777",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:25.04"
}