CVE-2020-10995: Debian Linux

High severity, CVSS 7.5. EPSS: 4.5% chance of exploitation in the next 30 days.

PowerDNS Recursor from 4.1.0 up to and including 4.3.0 does not sufficiently defend against amplification attacks. An issue in the DNS protocol has been found that allow malicious parties to use recursive DNS services to attack third party authoritative name servers. The attack uses a crafted reply by an authoritative name server to amplify the resulting traffic between the recursive and other authoritative name servers. Both types of service can suffer degraded performance as an effect. This is triggered by random subdomains in the NSDNAME in NS records. PowerDNS Recursor 4.1.16, 4.2.2 and 4.3.1 contain a mitigation to limit the impact of this DNS protocol issue.

Affected products

• Debian Debian Linux: version 10.0 only
• Fedoraproject Fedora: version 31 only; version 32 only
• Opensuse Backports Sle: version 15.0 only
• Opensuse Leap: version 15.1 only
• Powerdns Recursor: from 4.1.0, up to and including 4.3.0

Published 2020-05-19. Last modified 2026-06-17.