What’s Vulnerable › Vulnerabilities

CVE-2021-36754

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 64.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-07-30 · updated 2026-06-17
• Weakness: CWE-119

Description

PowerDNS Authoritative Server 4.5.0 before 4.5.1 allows anybody to crash the process by sending a specific query (QTYPE 65535) that causes an out-of-bounds exception.

Affected products

• PowerDNS Authoritative Server: from 4.5.0 before 4.5.1 — fixed in 4.5.1

How to fix

Upgrade to a fixed version: PowerDNS Authoritative Server 4.5.1. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2021/07/26/2
• https://doc.powerdns.com/authoritative/security-advisories/index.html
• https://doc.powerdns.com/authoritative/security-advisories/powerdns-advisory-2021-01.html
• http://www.openwall.com/lists/oss-security/2021/07/26/2
• https://doc.powerdns.com/authoritative/security-advisories/index.html
• https://doc.powerdns.com/authoritative/security-advisories/powerdns-advisory-2021-01.html

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