CVE catalog

CVE-2021-36754

pdns: CVE-2021-36754

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Jul 26, 2021, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 64.86% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	pdns	sid	`5.1.5-1`	not affected
Debian	pdns	forky	`5.1.5-1`	not affected
Debian	pdns	trixie	`4.9.17-0+deb13u1`	not affected
Debian	pdns	trixie-security	`4.9.18-0+deb13u1`	not affected
Debian	pdns	bookworm	`4.7.3-2`	not affected

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	pdns	source	sid	`Not affected`	unimportant	Not reported	Not reported
Debian	pdns	source	forky	`Not affected`	unimportant	Not reported	Not reported
Debian	pdns	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	pdns	source	bookworm	`Not affected`	unimportant	Not reported	Not reported

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[pdns-backend-bind]Unknown
Source package: [pdns]
Details (2)
- 4.7.3-2 · amd64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
- 4.7.3-2 · arm64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
[pdns-backend-geoip]Unknown
Source package: [pdns]
Details (2)
- 4.7.3-2 · amd64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
- 4.7.3-2 · arm64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
[pdns-backend-ldap]Unknown
Source package: [pdns]
Details (2)
- 4.7.3-2 · amd64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
- 4.7.3-2 · arm64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
[pdns-backend-lmdb]Unknown
Source package: [pdns]
Details (2)
- 4.7.3-2 · amd64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
- 4.7.3-2 · arm64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
[pdns-backend-lua2]Unknown
Source package: [pdns]
Details (2)
- 4.7.3-2 · amd64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
- 4.7.3-2 · arm64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
[pdns-backend-mysql]Unknown
Source package: [pdns]
Details (2)
- 4.7.3-2 · amd64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
- 4.7.3-2 · arm64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
[pdns-backend-odbc]Unknown
Source package: [pdns]
Details (2)
- 4.7.3-2 · amd64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
- 4.7.3-2 · arm64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
[pdns-backend-pgsql]Unknown
Source package: [pdns]
Details (2)
- 4.7.3-2 · amd64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
- 4.7.3-2 · arm64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
[pdns-backend-pipe]Unknown
Source package: [pdns]
Details (2)
- 4.7.3-2 · amd64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
- 4.7.3-2 · arm64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
[pdns-backend-remote]Unknown
Source package: [pdns]
Details (2)
- 4.7.3-2 · amd64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
- 4.7.3-2 · arm64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
[pdns-backend-sqlite3]Unknown
Source package: [pdns]
Details (2)
- 4.7.3-2 · amd64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
- 4.7.3-2 · arm64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
[pdns-backend-tinydns]Unknown
Source package: [pdns]
Details (2)
- 4.7.3-2 · amd64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
- 4.7.3-2 · arm64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
[pdns-ixfrdist]Unknown
Source package: [pdns]
Details (2)
- 4.7.3-2 · amd64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
- 4.7.3-2 · arm64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
[pdns-server]Unknown
Source package: [pdns]
Details (2)
- 4.7.3-2 · amd64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
- 4.7.3-2 · arm64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
[pdns-tools]Unknown
Source package: [pdns]
Details (2)
- 4.7.3-2 · amd64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm
- 4.7.3-2 · arm64 · bookworm
  Not affected
  dsa · pdns · debian · bookworm

Observed: Oct 27, 2026, 3:32:02 AM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]