TI-2021-12874 Aliases CVE-2021-33465 GHSA-xq4f-j8wj-pf7x

An issue was discovered in yasm version 1.3.0.

LOW 25CWE-476Published 2022-07-26 · Updated 2024-08-03

Key facts

Attack vector: Local
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-476.

Summary

An issue was discovered in yasm version 1.3.0. There is a NULL pointer dereference in expand_mmacro() in modules/preprocs/nasm/nasm-pp.c.

Why it matters now

EPSS 0.00325 25th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:tortall:yasm:1.3.0:::::::*	1.3.0	Vulnerable	Tortall

cpe:2.3:a:tortall:yasm:1.3.0:*:*:*:*:*:*:* Versions 1.3.0 Vulnerable ·Tortall

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2021-33465
2026-10-03 Alias added: GHSA-xq4f-j8wj-pf7x

References

Exploit 1

https://github.com/yasm/yasm/issues/173

Advisory 1

https://gist.github.com/Clingto/bb632c0c463f4b2c97e4f65f751c5e6d

TI-2023-15292 yasm v1.3.0 was discovered to contain a use after free via the function… CVSS 3.1HIGH 7.8
TI-2023-27964 A memory leak issue discovered in YASM v.1.3.0 allows a local attacker to cause a denial… CVSS 3.1MEDIUM 5.5
TI-2023-15293 yasm v1.3.0 was discovered to contain a use after free via the function error at… CVSS 3.1MEDIUM 5.5
TI-2023-15291 yasm v1.3.0 was discovered to contain a use after free via the function pp_getline at… CVSS 3.1MEDIUM 5.5
TI-2021-12877 An issue was discovered in yasm version 1.3.0. CVSS 3.1MEDIUM 5.5
TI-2021-12876 An issue was discovered in yasm version 1.3.0. CVSS 3.1MEDIUM 5.5

See all 18 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences