CVE-2023-32067

Name: CVE-2023-32067
Creator: NVD / NIST
Published: 2023-05-25T23:15:09.38+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.58%

Last modified Jun 17, 2026

CVE-2023-32067 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. c-ares is an asynchronous resolver library. c-ares is vulnerable to denial of service. EPSS estimates a 1.58% chance of exploitation in the next 30 days.

Description

c-ares is an asynchronous resolver library. c-ares is vulnerable to denial of service. If a target resolver sends a query, the attacker forges a malformed UDP packet with a length of 0 and returns them to the target resolver. The target resolver erroneously interprets the 0 length as a graceful shutdown of the connection. This issue has been patched in version 1.19.1.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.58%

72.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
C-Ares Project	C-Ares	< 1.19.1
Fedoraproject	Fedora	37
Fedoraproject	Fedora	38
Debian	Debian Linux	10.0
Debian	Debian Linux	11.0

References

https://github.com/c-ares/c-ares/releases/tag/cares-1_19_1Release Notes
https://github.com/c-ares/c-ares/security/advisories/GHSA-9g78-jv2r-p7vcThird Party Advisory
https://lists.debian.org/debian-lts-announce/2023/06/msg00034.htmlMailing List
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/B5Z5XFNXTNPTCBBVXFDNZQVLLIE6VRBY/Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UBFWILTA33LOSV23P44FGTQQIDRJHIY7/Mailing List, Third Party Advisory
https://security.gentoo.org/glsa/202310-09Third Party Advisory
https://security.netapp.com/advisory/ntap-20240605-0004/
https://www.debian.org/security/2023/dsa-5419Third Party Advisory
https://github.com/c-ares/c-ares/releases/tag/cares-1_19_1Release Notes
https://github.com/c-ares/c-ares/security/advisories/GHSA-9g78-jv2r-p7vcThird Party Advisory
https://lists.debian.org/debian-lts-announce/2023/06/msg00034.htmlMailing List
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/B5Z5XFNXTNPTCBBVXFDNZQVLLIE6VRBY/Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UBFWILTA33LOSV23P44FGTQQIDRJHIY7/Mailing List, Third Party Advisory
https://security.gentoo.org/glsa/202310-09Third Party Advisory
https://security.netapp.com/advisory/ntap-20240605-0004/
https://www.debian.org/security/2023/dsa-5419Third Party Advisory

Timeline

Published: May 25, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-32067?

How severe is CVE-2023-32067?

CVE-2023-32067 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.58% probability of exploitation in the next 30 days.

How do I fix CVE-2023-32067?

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-2023-32067?

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

Scan your code now

Source: NVD / NIST