CVE-2020-18780

Name: CVE-2020-18780
Creator: NVD / NIST
Published: 2023-08-22T19:15:55.74+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.27%

Last modified Jun 17, 2026

CVE-2020-18780 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. A Use After Free vulnerability in function new_Token in asm/preproc.c in nasm 2.14.02 allows attackers to cause a denial of service via crafted nasm command.. EPSS estimates a 0.27% chance of exploitation in the next 30 days.

Description

A Use After Free vulnerability in function new_Token in asm/preproc.c in nasm 2.14.02 allows attackers to cause a denial of service via crafted nasm command.

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

0.27%

17.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Nasm	Netwide Assembler	2.14.02

References

https://bugzilla.nasm.us/show_bug.cgi?id=3392634Exploit, Issue Tracking, Third Party Advisory
https://bugzilla.nasm.us/show_bug.cgi?id=3392634Exploit, Issue Tracking, Third Party Advisory

Timeline

Published: Aug 22, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-18780?

A Use After Free vulnerability in function new_Token in asm/preproc.c in nasm 2.14.02 allows attackers to cause a denial of service via crafted nasm command.

How severe is CVE-2020-18780?

CVE-2020-18780 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.27% probability of exploitation in the next 30 days.

How do I fix CVE-2020-18780?

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-2020-18780?

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

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Source: NVD / NIST