CVE-2021-40647

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.

CVSS v3.1

5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS

0.32% chance of exploitation in the next 30 days, 25th percentile

Published

2022-09-09

Updated

2024-08-04

Proof-of-concept exploits (1)

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

References

• CVE Record
• NVD entry

Related

• CVE-2021-40645
• CVE-2021-40648
• CVE-2021-40644
• CVE-2021-40649
• CVE-2021-40639
• CVE-2021-40650