Buffer overflow in Att Xmill

CVE-2021-21827

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.

Vulnerability class: Buffer Overflow

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.011 (65.2th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2021-21827: held from 0.011 to 0.011.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

  • Att Xmill — versions 0.7
  • AT&T — versions AT&T Labs Xmill 0.7, Schneider Electric EcoStruxure Control Expert 15

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2021-21827?
CVE-2021-21827 is a critical-severity vulnerability in Att Xmill, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2021-08-20.
How severe is CVE-2021-21827?
Critical severity. CVSS v3 base score is 9.8 out of 10.