CVE-2023-31130

Name: CVE-2023-31130
Creator: NVD / NIST
Published: 2023-05-25T22:15:09.76+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.4/10EPSS 0.33%

Last modified Jun 17, 2026

CVE-2023-31130 is a medium-severity vulnerability rated 6.4/10 on the CVSS scale. c-ares is an asynchronous resolver library. ares_inet_net_pton() is vulnerable to a buffer underflow for certain ipv6 addresses, in particular "0::00:00:00/2" was found to cause an issue. EPSS estimates a 0.33% chance of exploitation in the next 30 days.

Description

c-ares is an asynchronous resolver library. ares_inet_net_pton() is vulnerable to a buffer underflow for certain ipv6 addresses, in particular "0::00:00:00/2" was found to cause an issue. C-ares only uses this function internally for configuration purposes which would require an administrator to configure such an address via ares_set_sortlist(). However, users may externally use ares_inet_net_pton() for other purposes and thus be vulnerable to more severe issues. This issue has been fixed in 1.19.1.

Metrics

CVSS 3.1

6.4/10

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

EPSS Probability

0.33%

25.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

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-x6mf-cxr9-8q6vThird 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-20240605-0005/
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-x6mf-cxr9-8q6vThird 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-20240605-0005/
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-2023-31130?

How severe is CVE-2023-31130?

CVE-2023-31130 has a CVSS score of 6.4/10 (MEDIUM severity). The EPSS model estimates a 0.33% probability of exploitation in the next 30 days.

How do I fix CVE-2023-31130?

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-2023-31130?

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

Scan your code now

Source: NVD / NIST