CVE-2022-33993

Name: CVE-2022-33993
Creator: NVD / NIST
Published: 2022-08-15T12:15:19.2+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.74%

Last modified Jun 17, 2026

CVE-2022-33993 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. Misinterpretation of special domain name characters in DNRD (aka Domain Name Relay Daemon) 2.20.3 leads to cache poisoning because domain names and their associated IP addresses are cached in their misinterpreted form.. EPSS estimates a 0.74% chance of exploitation in the next 30 days.

Description

Misinterpretation of special domain name characters in DNRD (aka Domain Name Relay Daemon) 2.20.3 leads to cache poisoning because domain names and their associated IP addresses are cached in their misinterpreted form.

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

0.74%

49.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Domain Name Relay Daemon Project	Domain Name Relay Daemon	2.20.3

References

http://dnrd.sourceforge.net/Product, Third Party Advisory
https://www.openwall.com/lists/oss-security/2022/08/14/1Mailing List, Third Party Advisory
https://www.usenix.org/conference/usenixsecurity21/presentation/jeitnerThird Party Advisory
https://www.usenix.org/conference/usenixsecurity22/presentation/jeitnerThird Party Advisory
http://dnrd.sourceforge.net/Product, Third Party Advisory
https://www.openwall.com/lists/oss-security/2022/08/14/1Mailing List, Third Party Advisory
https://www.usenix.org/conference/usenixsecurity21/presentation/jeitnerThird 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-2022-33993?

How severe is CVE-2022-33993?

CVE-2022-33993 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.74% probability of exploitation in the next 30 days.

How do I fix CVE-2022-33993?

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-2022-33993?

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

Scan your code now

Source: NVD / NIST