What is CVE-2022-33991?

CVE-2022-33991 is a medium-severity vulnerability in Dproxy-Nexgen Project, classified under Authentication Bypass by Spoofing. CVSS score: 5.3/10. Published 2022-08-15.

How severe is CVE-2022-33991?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Dproxy-Nexgen Project

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.

Published 2022-08-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.009 (59.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 59.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: +0.000

Affected products

Dproxy-Nexgen Project

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

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

Frequently asked questions

What is CVE-2022-33991?: CVE-2022-33991 is a medium-severity vulnerability in Dproxy-Nexgen Project, classified under Authentication Bypass by Spoofing. CVSS score: 5.3/10. Published 2022-08-15.
How severe is CVE-2022-33991?: Medium severity. CVSS v3 base score is 5.3 out of 10.