CVE-2024-25581: Powerdns Dnsdist

High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days.

When incoming DNS over HTTPS support is enabled using the nghttp2 provider, and queries are routed to a tcp-only or DNS over TLS backend, an attacker can trigger an assertion failure in DNSdist by sending a request for a zone transfer (AXFR or IXFR) over DNS over HTTPS, causing the process to stop and thus leading to a Denial of Service. DNS over HTTPS is not enabled by default, and backends are using plain DNS (Do53) by default.

Affected products

• Powerdns Dnsdist: version 1.9.0 only; version 1.9.1 only; version 1.9.2 only; version 1.9.3 only

Published 2024-05-14. Last modified 2026-06-17.