CVE-2021-21825

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-08-18 · updated 2026-06-17
Weakness: CWE-122

Description

A heap-based buffer overflow vulnerability exists in the XML Decompression PlainTextUncompressor::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: 0.7

References

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1290
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1290

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