What’s Vulnerable › Vulnerabilities
CVE-2023-2911: Exceeding the recursive-clients quota may cause named to terminate unexpectedly when stale-answer-client-timeout is set to 0
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 2.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2023-06-21 · updated 2026-10-24
- Weakness: CWE-787
Description
If the `recursive-clients` quota is reached on a BIND 9 resolver configured with both `stale-answer-enable yes;` and `stale-answer-client-timeout 0;`, a sequence of serve-stale-related lookups could cause `named` to loop and terminate unexpectedly due to a stack overflow. This issue affects BIND 9 versions 9.16.33 through 9.16.41, 9.18.7 through 9.18.15, 9.16.33-S1 through 9.16.41-S1, and 9.18.11-S1 through 9.18.15-S1.
Affected products
- Debian Linux: 11.0, 12.0
- Fedoraproject Fedora: 37, 38
- ISC BIND: from 9.16.33 through 9.16.41; from 9.18.7 through 9.18.15; from 9.18.11 through 9.18.15
- Active IQ Unified Manager for VMware vSphere, Linux, and Microsoft Windows: all versions
- NetApp H300S Firmware: all versions
- NetApp H410C Firmware: all versions
- NetApp H410S Firmware: all versions
- NetApp H500S Firmware: all versions
- NetApp H700S Firmware: all versions
References
- http://www.openwall.com/lists/oss-security/2023/06/21/6
- https://kb.isc.org/docs/cve-2023-2911
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SEFCEVCTYEMKTWA7V7EYPI5YQQ4JWDLI/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U3K6AJK7RRSR53HRF5GGKPA6PDUDWOD2/
- https://security.netapp.com/advisory/ntap-20230703-0010/
- https://www.debian.org/security/2023/dsa-5439
- http://www.openwall.com/lists/oss-security/2023/06/21/6
- https://kb.isc.org/docs/cve-2023-2911
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SEFCEVCTYEMKTWA7V7EYPI5YQQ4JWDLI/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U3K6AJK7RRSR53HRF5GGKPA6PDUDWOD2/
- https://security.netapp.com/advisory/ntap-20230703-0010/
- https://www.debian.org/security/2023/dsa-5439
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