CVE-2020-21686

5.5 mediumEPSS 0.4%

Medium (5.5) in nasm netwide assembler. EPSS 0.4% chance of exploitation in the next 30 days.

A stack-use-after-scope issue discovered in expand_mmac_params function in preproc.c in nasm before 2.15.04 allows remote attackers to cause a denial of service via crafted asm file.

Severity

CVSS 3.1

5.5 medium

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

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 38% of CVEs (scores of 2026-10-31)
CWE: CWE-562
Published: 2023-08-22
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

nasm:netwide_assembler

References

https://bugzilla.nasm.us/show_bug.cgi?id=3392643
https://bugzilla.nasm.us/show_bug.cgi?id=3392643

Check your stack JSON