VULNERABILITY INTELLIGENCE

CVE-2021-21827

CVSS score9.8 CRITICAL
EPSS probability1.14%
CISA KEVNot currently listed
Published2021-08-20
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Weakness classification

  • talos-cna@cisco.com: CWE-120
  • nvd@nist.gov: CWE-787

Primary references