CVE-2021-36754

medium

Published — · Modified —

CVSS v3

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CVSS v2

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VIR risk

5.5

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.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-36754

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2021-36754.html

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-202107-73

OS impact

OS	Version	Status	Fixed in
arch		fixed	`4.5.1-1`
sles		affected
debian	bookworm	fixed	`0`
debian	bullseye	fixed	`0`
debian	forky	fixed	`0`
debian	sid	fixed	`0`
debian	trixie	fixed	`0`

References

https://security.archlinux.org/ASA-202107-73
https://www.suse.com/security/cve/CVE-2021-36754.html
https://security-tracker.debian.org/tracker/CVE-2021-36754

Verify integrity in audit chain (admin only). AS-IS.