CVE intelligence

CVE-2023-31130

Vulnerability intelligence

Published May 25, 2023Sources checked Oct 29, 2026

6.4MEDIUMCVSS out of 10

What this means

Review the available evidence

CVE-2023-31130 and is rated Medium severity with a CVSS score of 6.4. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: Oct 21, 2026

Vendor remediation details

CBL-Mariner Releases

Vendor-listed releases

1.19.1-1
21.1.2-3
18.17.1-2
16.20.1-2
1.42.0-11
2.1.10-1
1.62.0-2

CISA KEVNot listedBased on the latest collected catalog

EPSS0.4%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2023-31130?

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.

Source: NVD