Vulnerability · Published Sep 9, 2022 · Assigned by mitre
CVE-2021-40647
Medium 5.5
In plain English
A medium-severity security flaw in the man2html package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.3%top 72.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | man2html | no fix listed | DEBIAN-CVE-2021-40647 |
| Debian:13 | man2html | 1.6g-16 | DEBIAN-CVE-2021-40647 |
| Debian:14 | man2html | 1.6g-16 | DEBIAN-CVE-2021-40647 |
| Ubuntu:22.04:LTS | man2html | no fix listed | UBUNTU-CVE-2021-40647 |
| Ubuntu:24.04:LTS | man2html | no fix listed | UBUNTU-CVE-2021-40647 |
| Ubuntu:25.10 | man2html | no fix listed | UBUNTU-CVE-2021-40647 |
| Ubuntu:26.04:LTS | man2html | no fix listed | UBUNTU-CVE-2021-40647 |
| Ubuntu:26.10 | man2html | no fix listed | UBUNTU-CVE-2021-40647 |
Affected products (as reported)
References
- https://gist.github.com/untaman/cb58123fe89fc65e3984165db5d40933 x_refsource_MISC