CVE-2023-31973

Name: CVE-2023-31973
Creator: NVD / NIST
Published: 2023-05-09T14:15:13.737+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.31%

Last modified Jun 17, 2026

CVE-2023-31973 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. yasm v1.3.0 was discovered to contain a use after free via the function expand_mmac_params at /nasm/nasm-pp.c. Note: Multiple third parties dispute this as a bug and not a vulnerability according to the YASM security policy.. EPSS estimates a 0.31% chance of exploitation in the next 30 days.

Description

yasm v1.3.0 was discovered to contain a use after free via the function expand_mmac_params at /nasm/nasm-pp.c. Note: Multiple third parties dispute this as a bug and not a vulnerability according to the YASM security policy.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.31%

22.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Tortall	Yasm	1.3.0

References

https://github.com/yasm/yasm/issues/207Exploit, Issue Tracking
https://github.com/yasm/yasm/issues/207Exploit, Issue Tracking

Timeline

Published: May 9, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-31973?

How severe is CVE-2023-31973?

CVE-2023-31973 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.31% probability of exploitation in the next 30 days.

How do I fix CVE-2023-31973?

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-2023-31973?

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

Scan your code now

Source: NVD / NIST