CVEvulnerability

CVE-2020-10995

7.5 HIGH Published 2020-05-19 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2020-05-19
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0 ([email protected])
5.0 MEDIUM — AV:N/AC:L/Au:N/C:N/I:N/A:P
Weaknesses
CWE-400

Description

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 configurations

• powerdns recursor (>= 4.1.0 <= 4.3.0) • fedoraproject fedora 31 • fedoraproject fedora 32 • debian debian linux 10.0 • opensuse backports sle 15.0 • opensuse leap 15.1

Related

Weakness · CWE (1)

  • CWE-400 Uncontrolled Resource Consumption weakness

References