CVE-2026-33601 | BDVDB-2026-328451 Detail

PowerDNSRecursor

Description#

If you use the zoneToCache function with a malicious authoritative server, an attacker can send a zone that result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service.

Impact#

Per CVSS v3.1: confidentiality impact none, integrity impact none, availability impact high. Attack vector: network.

Weaknesses#

CWE-476 NULL Pointer Dereference

References#

https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-03.html

Exploit#

No public exploit known

History#

Version 12026-04-22Record published in the CVE List.

Published

Published: 2026-04-22
Last modified: 2026-04-22

Vendor information

Vendor: PowerDNS
Product: Recursor

All PowerDNS vulnerabilities

Score

4.4 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 44.0.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Memory Corruption

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 5.4.0 and < 5.4.1
Fixed
5.4.1
Vulnerable
>= 5.3.0 and < 5.3.6
Fixed
5.3.6
Vulnerable
>= 5.2.0 and < 5.2.9
Fixed
5.2.9

Scoring System

CVSS v4.0

Not available

CVSS v3.1

4.4 Medium

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

Metric breakdown
Attack Vector	Network
Attack Complexity	High
Privileges Required	High
User Interaction	None
Scope	Unchanged
Confidentiality	None
Integrity	None
Availability	High

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).