CVE-2022-33991

Name: CVE-2022-33991
Creator: NVD / NIST
Published: 2022-08-15T13:15:19.047+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.75%

Last modified Jun 17, 2026

CVE-2022-33991 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. dproxy-nexgen (aka dproxy nexgen) forwards and caches DNS queries with the CD (aka checking disabled) bit set to 1. This leads to disabling of DNSSEC protection provided by upstream resolvers.. EPSS estimates a 0.75% chance of exploitation in the next 30 days.

Description

dproxy-nexgen (aka dproxy nexgen) forwards and caches DNS queries with the CD (aka checking disabled) bit set to 1. This leads to disabling of DNSSEC protection provided by upstream resolvers.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

0.75%

50.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-290

Affected Software

Vendor	Product	Versions
Dproxy-Nexgen Project	Dproxy-Nexgen	All versions

References

https://sourceforge.net/projects/dproxy/Third Party Advisory
https://www.openwall.com/lists/oss-security/2022/08/14/3Exploit, Mailing List, Third Party Advisory
https://www.usenix.org/conference/usenixsecurity22/presentation/jeitnerThird Party Advisory
https://sourceforge.net/projects/dproxy/Third Party Advisory
https://www.openwall.com/lists/oss-security/2022/08/14/3Exploit, Mailing List, Third Party Advisory
https://www.usenix.org/conference/usenixsecurity22/presentation/jeitnerThird Party Advisory

Timeline

Published: Aug 15, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-33991?

dproxy-nexgen (aka dproxy nexgen) forwards and caches DNS queries with the CD (aka checking disabled) bit set to 1. This leads to disabling of DNSSEC protection provided by upstream resolvers.

How severe is CVE-2022-33991?

CVE-2022-33991 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.75% probability of exploitation in the next 30 days.

How do I fix CVE-2022-33991?

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-2022-33991?

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

Scan your code now

Source: NVD / NIST