| Package | Affected versions | Patched versions |
|---|---|---|
| bind | ≥ 9.20.0, ≤ 9.20.24≥ 9.20.9, ≤ 9.20.24≥ 9.21.0, ≤ 9.21.23 |
The issue is a resource exhaustion vulnerability associated with DNSSEC validation. BIND always validates all RRSIG records in an answer, even if they are not strictly needed. A query to an authoritative server/zone which returns many valid but superfluous RRSIG records causes the validator to waste disproportionate CPU time. This issue affects BIND 9 versions 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, and 9.20.9-S1 through 9.20.24-S1.
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