CVE-2025-8677: ISC BIND 9

High severity, CVSS 7.5. EPSS: 10.7% chance of exploitation in the next 30 days.

Querying for records within a specially crafted zone containing certain malformed DNSKEY records can lead to CPU exhaustion. This issue affects BIND 9 versions 9.18.0 through 9.18.39, 9.20.0 through 9.20.13, 9.21.0 through 9.21.12, 9.18.11-S1 through 9.18.39-S1, and 9.20.9-S1 through 9.20.13-S1.

Affected products

• ISC BIND 9: from 9.18.0, up to and including 9.18.39; from 9.20.0, up to and including 9.20.13; from 9.21.0, up to and including 9.21.12; from 9.18.11-S1, up to and including 9.18.39-S1; from 9.20.9-S1, up to and including 9.20.13-S1

Published 2025-10-22. Last modified 2026-10-08.