CVE catalog

CVE-2025-40777

bind9: CVE-2025-40777

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Jul 16, 2025, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 1.03% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	bind9	sid	`1:9.20.30-1`	fixed
Debian	bind9	forky	`1:9.20.30-1`	fixed
Debian	bind9	trixie	`1:9.20.26-1~deb13u1`	fixed
Debian	bind9	trixie-security	`1:9.20.30-1~deb13u1`	fixed
Debian	bind9	bookworm	`1:9.18.49-1~deb12u1`	not affected
Debian	bind9	bookworm-security	`1:9.18.49-1~deb12u3`	not affected
Alpine	bind	3.22	`9.20.11-r0`	fixed
Alpine	bind	3.23	`9.20.11-r0`	fixed
Alpine	bind	3.24	`9.20.11-r0`	fixed
Opensuse	bind	tumbleweed	`9.20.11-1.1`	fixed
Suse	bind	linux enterprise module for basesystem 15 sp7	`9.20.11-150700.3.6.1`	fixed
Suse	bind	linux enterprise module for server applications 15 sp7	`9.20.11-150700.3.6.1`	fixed
Ubuntu	bind9	25.04	`1:9.20.0-2ubuntu3`	vulnerable
Ubuntu	bind9	25.04	`1:9.20.0-2ubuntu4`	vulnerable
Ubuntu	bind9	25.04	`1:9.20.4-3ubuntu1`	vulnerable
Ubuntu	bind9	25.04	`1:9.20.4-3ubuntu1.1`	vulnerable
Ubuntu	bind9	25.04	`1:9.20.4-3ubuntu1.2`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	bind9	source	sid	`1:9.20.11-1`	not yet assigned	Not reported	Not reported
Debian	bind9	source	forky	`1:9.20.11-1`	not yet assigned	Not reported	Not reported
Debian	bind9	source	trixie	`1:9.20.11-1`	not yet assigned	Not reported	Not reported
Debian	bind9	source	bookworm	`Not affected`	unimportant	Not reported	Not reported
Alpine	bind	apk	3.22	`9.20.11-r0`	Not reported	ALPINE-CVE-2025-40777	Not reported
Alpine	bind	apk	3.23	`9.20.11-r0`	Not reported	ALPINE-CVE-2025-40777	Not reported
Alpine	bind	apk	3.24	`9.20.11-r0`	Not reported	ALPINE-CVE-2025-40777	Not reported
Opensuse	bind	rpm	tumbleweed	`9.20.11-1.1`	Not reported	OPENSUSE-SU-2025:15354-1	Not reported
Suse	bind	rpm	linux enterprise module for basesystem 15 sp7	`9.20.11-150700.3.6.1`	Not reported	SUSE-SU-2025:02349-1	Not reported
Suse	bind	rpm	linux enterprise module for server applications 15 sp7	`9.20.11-150700.3.6.1`	Not reported	SUSE-SU-2025:02349-1	Not reported
Ubuntu	bind9	deb	25.04	`1:9.20.4-3ubuntu1.2`	Not reported	USN-7641-1	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[bind9]Affected
Details (6)
- 1:9.18.49-1~deb12u1 · amd64 · bookworm
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u1 · arm64 · bookworm
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · amd64 · bookworm-backports
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · arm64 · bookworm-backports
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · amd64 · bookworm-security
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · arm64 · bookworm-security
  Affected
  dsa · bind9 · debian · bookworm
[bind9-dev]Affected
Source package: [bind9]
Details (6)
- 1:9.18.49-1~deb12u1 · amd64 · bookworm
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u1 · arm64 · bookworm
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · amd64 · bookworm-backports
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · arm64 · bookworm-backports
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · amd64 · bookworm-security
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · arm64 · bookworm-security
  Affected
  dsa · bind9 · debian · bookworm
[bind9-dnsutils]Affected
Source package: [bind9]
Details (6)
- 1:9.18.49-1~deb12u1 · amd64 · bookworm
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u1 · arm64 · bookworm
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · amd64 · bookworm-backports
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · arm64 · bookworm-backports
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · amd64 · bookworm-security
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · arm64 · bookworm-security
  Affected
  dsa · bind9 · debian · bookworm
[bind9-doc]Affected
Source package: [bind9]
Details (6)
- 1:9.18.49-1~deb12u1 · all · bookworm
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u1 · all · bookworm
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · all · bookworm-backports
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · all · bookworm-backports
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · all · bookworm-security
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · all · bookworm-security
  Affected
  dsa · bind9 · debian · bookworm
[bind9-host]Affected
Source package: [bind9]
Details (6)
- 1:9.18.49-1~deb12u1 · amd64 · bookworm
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u1 · arm64 · bookworm
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · amd64 · bookworm-backports
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · arm64 · bookworm-backports
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · amd64 · bookworm-security
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · arm64 · bookworm-security
  Affected
  dsa · bind9 · debian · bookworm
[bind9-libs]Affected
Source package: [bind9]
Details (6)
- 1:9.18.49-1~deb12u1 · amd64 · bookworm
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u1 · arm64 · bookworm
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · amd64 · bookworm-backports
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · arm64 · bookworm-backports
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · amd64 · bookworm-security
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · arm64 · bookworm-security
  Affected
  dsa · bind9 · debian · bookworm
[bind9-utils]Affected
Source package: [bind9]
Details (6)
- 1:9.18.49-1~deb12u1 · amd64 · bookworm
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u1 · arm64 · bookworm
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · amd64 · bookworm-backports
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · arm64 · bookworm-backports
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · amd64 · bookworm-security
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · arm64 · bookworm-security
  Affected
  dsa · bind9 · debian · bookworm
[bind9utils]Affected
Source package: [bind9]
Details (4)
- 1:9.18.49-1~deb12u1 · all · bookworm
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u1 · all · bookworm
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · all · bookworm-security
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · all · bookworm-security
  Affected
  dsa · bind9 · debian · bookworm
[dnsutils]Affected
Source package: [bind9]
Details (4)
- 1:9.18.49-1~deb12u1 · all · bookworm
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u1 · all · bookworm
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · all · bookworm-security
  Affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · all · bookworm-security
  Affected
  dsa · bind9 · debian · bookworm

[openSUSE Tumbleweed]

[bind-doc]Unknown
Source package: [bind]
Details (1)
- 9.20.26-1.2 · noarch · tumbleweed
  Unknown · Fixed: 9.20.11-1.1
  Version impact unknown
  dsa · bind · opensuse · tumbleweed
[bind-modules-bdbhpt]Unknown
Source package: [bind]
Details (1)
- 9.20.26-1.2 · x86_64 · tumbleweed
  Unknown · Fixed: 9.20.11-1.1
  Version impact unknown
  dsa · bind · opensuse · tumbleweed
[bind-modules-generic]Unknown
Source package: [bind]
Details (1)
- 9.20.26-1.2 · x86_64 · tumbleweed
  Unknown · Fixed: 9.20.11-1.1
  Version impact unknown
  dsa · bind · opensuse · tumbleweed
[bind-modules-ldap]Unknown
Source package: [bind]
Details (1)
- 9.20.26-1.2 · x86_64 · tumbleweed
  Unknown · Fixed: 9.20.11-1.1
  Version impact unknown
  dsa · bind · opensuse · tumbleweed
[bind-modules-mysql]Unknown
Source package: [bind]
Details (1)
- 9.20.26-1.2 · x86_64 · tumbleweed
  Unknown · Fixed: 9.20.11-1.1
  Version impact unknown
  dsa · bind · opensuse · tumbleweed
[bind-modules-perl]Unknown
Source package: [bind]
Details (1)
- 9.20.26-1.2 · x86_64 · tumbleweed
  Unknown · Fixed: 9.20.11-1.1
  Version impact unknown
  dsa · bind · opensuse · tumbleweed
[bind-modules-sqlite3]Unknown
Source package: [bind]
Details (1)
- 9.20.26-1.2 · x86_64 · tumbleweed
  Unknown · Fixed: 9.20.11-1.1
  Version impact unknown
  dsa · bind · opensuse · tumbleweed
[bind-utils]Unknown
Source package: [bind]
Details (1)
- 9.20.26-1.2 · x86_64 · tumbleweed
  Unknown · Fixed: 9.20.11-1.1
  Version impact unknown
  dsa · bind · opensuse · tumbleweed

[Debian 13 (Trixie)]

[bind9]Fixed
Details (6)
- 1:9.20.23-1~deb13u1 · amd64 · trixie
  Fixed · Fixed: 1:9.20.11-1
  dsa · bind9 · debian · 13
- 1:9.20.23-1~deb13u1 · arm64 · trixie
  Fixed · Fixed: 1:9.20.11-1
  dsa · bind9 · debian · 13
- 1:9.20.26-1~deb13u1 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 1:9.20.11-1
  dsa · bind9 · debian · 13
- 1:9.20.26-1~deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 1:9.20.11-1
  dsa · bind9 · debian · 13
- 1:9.20.29-1~deb13u1 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 1:9.20.11-1
  dsa · bind9 · debian · 13
- 1:9.20.30-1~deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 1:9.20.11-1
  dsa · bind9 · debian · 13
[bind9-dev]Fixed
Source package: [bind9]
Details (6)
- 1:9.20.23-1~deb13u1 · amd64 · trixie
  Fixed · Fixed: 1:9.20.11-1
  dsa · bind9 · debian · 13
- 1:9.20.23-1~deb13u1 · arm64 · trixie
  Fixed · Fixed: 1:9.20.11-1
  dsa · bind9 · debian · 13
- 1:9.20.26-1~deb13u1 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 1:9.20.11-1
  dsa · bind9 · debian · 13
- 1:9.20.26-1~deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 1:9.20.11-1
  dsa · bind9 · debian · 13
- 1:9.20.29-1~deb13u1 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 1:9.20.11-1
  dsa · bind9 · debian · 13
- 1:9.20.30-1~deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 1:9.20.11-1
  dsa · bind9 · debian · 13
[bind9-dnsutils]Fixed
Source package: [bind9]
Details (6)
- 1:9.20.23-1~deb13u1 · amd64 · trixie
  Fixed · Fixed: 1:9.20.11-1
  dsa · bind9 · debian · 13
- 1:9.20.23-1~deb13u1 · arm64 · trixie
  Fixed · Fixed: 1:9.20.11-1
  dsa · bind9 · debian · 13
- 1:9.20.26-1~deb13u1 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 1:9.20.11-1
  dsa · bind9 · debian · 13
- 1:9.20.26-1~deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 1:9.20.11-1
  dsa · bind9 · debian · 13
- 1:9.20.29-1~deb13u1 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 1:9.20.11-1
  dsa · bind9 · debian · 13
- 1:9.20.30-1~deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 1:9.20.11-1
  dsa · bind9 · debian · 13

Next results

Observed: Oct 27, 2026, 12:54:21 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]