CVE-2021-21829: Att Xmill

Critical severity, CVSS 9.8. EPSS: 2.5% chance of exploitation in the next 30 days.

A heap-based buffer overflow vulnerability exists in the XML Decompression EnumerationUncompressor::UncompressItem functionality of AT&T Labs’ Xmill 0.7. A specially crafted XMI file can lead to remote code execution. An attacker can provide a malicious file to trigger this vulnerability.

Affected products

• Att Xmill: version 0.7 only

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