PT-2025-29873 · Isc+3 · Bind+3

Published 2025-07-16 · Updated 2025-11-10 · CVE-2025-40777

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions BIND versions 9.20.0 through 9.20.10 BIND versions 9.21.0 through 9.21.9 BIND versions 9.20.9-S1 through 9.20.10-S1

Description If a named caching resolver is configured with serve-stale-enable set to yes, and with stale-answer-client-timeout set to 0, and if the resolver encounters a CNAME chain involving a specific combination of cached or authoritative records, the daemon will abort with an assertion failure.

Recommendations Update BIND to a version beyond 9.20.10, 9.21.9, and 9.20.10-S1.

Fix

Assertion Failure

Weakness Enumeration

CWE-617

Related Identifiers

AZL-65553

CVE-2025-40777

OPENSUSE-SU-2025:15354-1

SUSE-SU-2025:02349-1

SUSE-SU-2025_02349-1

USN-7641-1

Affected Products

Bind

Debian

Suse

Ubuntu

References · 39

• https://ubuntu.com/security/notices/USN-7641-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-40777 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-40777 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2025-40777 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-11-CVE-2025-40777 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40777 · Vendor Advisory
• https://osv.dev/vulnerability/ALPINE-CVE-2025-40777 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2025-40777 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-40777 · Vendor Advisory
• https://osv.dev/vulnerability/USN-7641-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-40777 · Security Note
• https://osv.dev/vulnerability/AZL-65553 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2025:15354-1 · Vendor Advisory
• https://kb.isc.org/docs/cve-2025-40777 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-40777 · Vendor Advisory