CVE-2025-40776highCWE-349

CVE-2025-40776: high-severity vulnerability in ISC BIND 9

Birthday Attack against Resolvers supporting ECS

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21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 8.6epss 0.2%
A `named` caching resolver that is configured to send ECS (EDNS Client Subnet) options may be vulnerable to a cache-poisoning attack. This issue affects BIND 9 versions 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.37-S1, and 9.20.9-S1 through 9.20.10-S1.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
Affected products
ISC · BIND 9
Related CVEs — ISC BIND 9

In the same product, most dangerous first.

CVE-2018-5740HIGHA flaw in the "deny-answer-aliases" feature can cause an assertion failure in namedEPSS 60.2%CVE-2022-3736HIGHnamed configured to answer from stale cache may terminate unexpectedly while processing RRSIG queriesEPSS 48.4%CVE-2017-3145HIGHImproper fetch cleanup sequencing in the resolver can cause named to crashEPSS 27.7%CVE-2022-3488HIGHnamed may terminate unexpectedly when processing ECS options in repeated responses to iterative queriesEPSS 19.0%CVE-2024-12705HIGHDNS-over-HTTPS implementation suffers from multiple issues under heavy query loadEPSS 18.6%CVE-2017-3143HIGHAn error in TSIG authentication can permit unauthorized dynamic updatesEPSS 18.2%