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CVE-2026-33601

MEDIUMCVSS 4.9/10EPSS 0.51%

Last modified

CVE-2026-33601 is a medium-severity vulnerability rated 4.9/10 on the CVSS scale. 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.. EPSS estimates a 0.51% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
4.9/10

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

EPSS Probability
0.51%

39.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
PowerdnsRecursor>= 5.2.0, < 5.2.9
PowerdnsRecursor>= 5.3.0, < 5.3.6
PowerdnsRecursor5.4.0

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2026-33601?
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.
How severe is CVE-2026-33601?
CVE-2026-33601 has a CVSS score of 4.9/10 (MEDIUM severity). The EPSS model estimates a 0.51% probability of exploitation in the next 30 days.
How do I fix CVE-2026-33601?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-33601?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST