🛡️ CVE-2025-40778 on Ubuntu — bind9

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Under certain circumstances, BIND is too lenient when accepting records from answers, allowing an attacker to inject forged data into the cache. This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.39, 9.20.0 through 9.20.13, 9.21.0 through 9.21.12, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.39-S1, and 9.20.9-S1 through 9.20.13-S1.

Distribution advisory

This page covers CVE-2025-40778 as tracked by Ubuntu, for the package bind9. The fix is available in version 1:9.20.11-1ubuntu3; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality none, integrity high, availability none.

Affected software and timeline

Affected software: bind9 (fixed in 1:9.20.11-1ubuntu3), bind9-libs and isc-dhcp. Published on 22 October 2025 and last revised on 20 May 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
www.cve.org (Report)
ubuntu.com (Advisory)
ubuntu.com (Advisory)

CVE-2025-40778 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2025-10-22
Updated 2026-08-12
Modified 2026-05-20
Fix URL N/A

Affected Packages

Software From version Fixed in
bind9 — 1:9.20.11-1ubuntu3
bind9-libs — —
isc-dhcp — —

Site Security Check

Is bind9 part of your stack?

UBUNTU-CVE-2025-40778 is rated CVSS 8.6 High. BotEraser scans your installation against known CVE records and tells you whether this vulnerability applies to the versions you actually run.

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More UBUNTU CVE 2025 advisories

Part of UBUNTU CVE 2025 in the advisory index.