CVE-2021-21812: Att Xmill

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

A stack-based buffer overflow vulnerability exists in the command-line-parsing HandleFileArg functionality of AT&T Labs’ Xmill 0.7. Within the function HandleFileArg the argument filepattern is under control of the user who passes it in from the command line. filepattern is passed directly to strcpy copying the path provided by the user into a static sized buffer without any length checks resulting in a stack-buffer overflow. An attacker can provide malicious input to trigger these vulnerabilities.

Affected products

• Att Xmill: version 0.7 only

Published 2021-08-13. Last modified 2026-06-17.