UBUNTU-CVE-2025-40777

See a problem?
Please try reporting it to the source first.

Source

https://ubuntu.com/security/CVE-2025-40777

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-40777.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2025-40777

Upstream

CVE-2025-40777

Downstream

USN-7641-1

Related

USN-7641-1

Withdrawn

2026-01-20T05:33:06Z

Published

2025-07-16T00:00:00Z

Modified

2026-02-04T04:21:00.727545Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

If a named caching resolver is configured with serve-stale-enable yes, and with stale-answer-client-timeout set to 0 (the only allowable value other than disabled), and if the resolver, in the process of resolving a query, encounters a CNAME chain involving a specific combination of cached or authoritative records, the daemon will abort with an assertion failure. This issue affects BIND 9 versions 9.20.0 through 9.20.10, 9.21.0 through 9.21.9, and 9.20.9-S1 through 9.20.10-S1.

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

{
    "binaries": [
        {
            "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",
            "binary_version": "1:9.20.4-3ubuntu1.2"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-40777.json"