BIND DNS Servers Hit by 14 Security Flaws Enabling Cache Poisoning and Remote Crashes
ISC patched 14 high-severity BIND 9 flaws enabling DNS cache poisoning, DNSSEC bypass, and remote crashes of exposed recursive resolvers.
62
CVE-2025-40777
- CVSS 3.1
- 7.5 high
- EPSS
- <1%p58
- Published
- ·
- Modified
Description · NVD
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.
- Weakness
- CWE-617
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H