What’s Vulnerable › Vulnerabilities

CVE-2021-40647

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-09-09 · updated 2026-06-17
• Weakness: CWE-787

Description

In man2html 1.6g, a specific string being read in from a file will overwrite the size parameter in the top chunk of the heap. This at least causes the program to segmentation abort if the heap size parameter isn't aligned correctly. In version before GLIBC version 2.29 and aligned correctly, it allows arbitrary write anywhere in the programs memory.

Affected products

• Man2Html Project Man2Html: 1.6g

References

• https://gist.github.com/untaman/cb58123fe89fc65e3984165db5d40933
• https://gist.github.com/untaman/cb58123fe89fc65e3984165db5d40933

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