Cyber Resilience

CVE-2020-21686

MediumPublic PoC

Published: 22 August 2023

Published
22 August 2023
Modified
21 November 2024
KEV Added
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Patch
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CVSS Score v3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
EPSS Score 0.0023 45.9th percentile
Risk Priority 11 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2020-21686 is a medium-severity Return of Stack Variable Address (CWE-562) vulnerability in Nasm Netwide Assembler. Its CVSS base score is 5.5 (Medium).

Operationally, ranked at the 45.9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

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.

CWE(s)
NVD-CWE-OtherCWE-562

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

nasm
netwide assembler
≤ 2.15.04

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References