What’s Vulnerable › Vulnerabilities

CVE-2021-21827

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-08-20 · updated 2026-06-17
• Weakness: CWE-120

Description

A heap-based buffer overflow vulnerability exists in the XML Decompression DecodeTreeBlock functionality of AT&T Labs Xmill 0.7. Within `DecodeTreeBlock` which is called during the decompression of an XMI file, a UINT32 is loaded from the file and used as trusted input as the length of a buffer. An attacker can provide a malicious file to trigger this vulnerability.

Affected products

• Att Xmill: 0.7

References

• https://talosintelligence.com/vulnerability_reports/TALOS-2021-1291
• https://talosintelligence.com/vulnerability_reports/TALOS-2021-1291

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