CVE-2021-43579

EPSS 7.3%

Vexday Risk Score

23Low

SSVC decision (CISA)

Attend

PoC available → attend closely

Exploit maturity

Proof of concept

Public proof of concept exists, but not yet automated.

CVSS —EPSS 7.3%KEV nãoPoC públicaNuclei —Metasploit —Patch —

Lifecycle

12 Nov 2021Published on NVD

16 Sep 2025Public PoC

Weaponization speed

1403 daysto first PoC

Recommendation: Plan a near-term fix — a public PoC already exists.

A stack-based buffer overflow in image_load_bmp() in HTMLDOC <= 1.9.13 results in remote code execution if the victim converts an HTML document linking to a crafted BMP file.

Affected products

n/a · n/a

public PoCs found — 1

exploitdbwww.exploit-db.com/exploits/52425unverified

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

References

https://github.com/michaelrsweet/htmldoc/commit/27d08989a5a567155d506ac870ae7d8cc88fa58b https://github.com/michaelrsweet/htmldoc/compare/v1.9.12...v1.9.13 https://github.com/michaelrsweet/htmldoc/issues/453 https://github.com/michaelrsweet/htmldoc/issues/456 https://lists.debian.org/debian-lts-announce/2022/02/msg00022.html