CVE-2021-21829: att xmill Heap-based Buffer Overflow

Vulnerability summary

CVE-2021-21829 is a critical (CVSS 9.8) Heap-based Buffer Overflow vulnerability in att xmill. EPSS estimates a 2.54% chance of exploitation in the next 30 days, higher than 84.7% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 13-08-2021
   PublishedVulnerability first disclosed.
2. 03-08-2024
   Last modifiedVulnerability information updated.

Description

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.

• CWE-122Heap-based Buffer OverflowA heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.