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CVE-2022-3736: named configured to answer from stale cache may terminate unexpectedly while processing RRSIG queries

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 48.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-01-26 · updated 2026-06-17
• Weakness: CWE-20

Description

BIND 9 resolver can crash when stale cache and stale answers are enabled, option `stale-answer-client-timeout` is set to a positive integer, and the resolver receives an RRSIG query. This issue affects BIND 9 versions 9.16.12 through 9.16.36, 9.18.0 through 9.18.10, 9.19.0 through 9.19.8, and 9.16.12-S1 through 9.16.36-S1.

Affected products

• ISC BIND: from 9.16.12 before 9.16.37; from 9.18.0 before 9.18.11; from 9.19.0 before 9.19.9; 9.16.11-s1, 9.16.13-s1, 9.16.14-s1, 9.16.21-s1, 9.16.32-s1, 9.16.36-s1 — fixed in 9.16.37, 9.18.11, 9.19.9

How to fix

Upgrade to a fixed version: ISC BIND 9.16.37, 9.18.11, 9.19.9. Check the vendor advisory for mitigations.

References

• https://kb.isc.org/docs/cve-2022-3736
• https://kb.isc.org/docs/cve-2022-3736

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