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Vulnerability record · CVE-2020-24696 · published 2 October 2020

CVE-2020-24696: Powerdns authoritative race condition vulnerability

Powerdns · Authoritative

An issue was discovered in PowerDNS Authoritative through 4.3.0 when --enable-experimental-gss-tsig is used. A remote, unauthenticated attacker can trigger a race condition leading to a crash, or possibly arbitrary code execution, by sending crafted queries with a GSS-TSIG signature.

8.1 CVSS 3.1 High EPSS 1.4% · top 29.3% CWE-362 · Race condition
8.1CVSS 3.1 base score, v2 5.1
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in PowerDNS Authoritative through 4.3.0 when --enable-experimental-gss-tsig is used. A remote, unauthenticated attacker can trigger a race condition leading to a crash, or possibly arbitrary code execution, by sending crafted queries with a GSS-TSIG signature.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://doc.powerdns.com/authoritative/security-advisories/powerdns-advisory-2020-06.html Vendor Advisory
https://doc.powerdns.com/authoritative/security-advisories/powerdns-advisory-2020-06.html Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-33608Powerdns authoritative code injection vulnerabilityAn attacker can send a notify request that causes a new secondary domain to be added to the bind backend, but causes said backend to update its confi…EPSS 0.59%9.8CVE-2020-24698Powerdns authoritative double free vulnerabilityAn issue was discovered in PowerDNS Authoritative through 4.3.0 when --enable-experimental-gss-tsig is used. A remote, unauthenticated attacker might…EPSS 3.2%8.6CVE-2026-42000Powerdns authoritative command injection vulnerabilityInsufficient Validation of Names During AXFREPSS 0.54%7.8CVE-2015-5470Powerdns authoritative vulnerabilityThe label decompression functionality in PowerDNS Recursor before 3.6.4 and 3.7.x before 3.7.3 and Authoritative (Auth) Server before 3.3.3 and 3.4.x…EPSS 11%7.8CVE-2015-1868PowerDNS label decompression self-referential name denial of serviceThe label decompression code in PowerDNS Recursor (3.5.x, 3.6.x before 3.6.3, 3.7.x before 3.7.2) and Authoritative Server (3.2.x, 3.3.x before 3.3.2…EPSS 82%analysed7.5CVE-2026-42001Powerdns authoritative uncontrolled resource consumption vulnerabilityInsufficient Validation of Autoprimary SOA QueriesEPSS 0.80%7.5CVE-2026-42002Powerdns authoritative vulnerabilityConcurrency and locking defects in GSS-TSIGEPSS 0.58%7.5CVE-2026-33610Powerdns authoritative uncontrolled resource consumption vulnerabilityA rogue primary server may cause file descriptor exhaustion and eventually a denial of service, when a PowerDNS secondary server forwards a DNS updat…EPSS 0.73%

Source: NIST National Vulnerability Database (record CVE-2020-24696), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.