CVE-2025-8351: Gen Digital Avira Antivirus

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

Heap-based Buffer Overflow, Out-of-bounds Read vulnerability in Avira Antivirus engine when scanning a malformed file may allow Local Execution of Code or Denial-of-Service of the antivirus engine process. This issue affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.70.98.

Affected products

• Gen Digital Avira Antivirus: before 8.3.70.98 (fixed in 8.3.70.98)

Published 2025-12-01. Last modified 2026-06-17.