Buffer overflow in Avast Antivirus
CVE-2025-8351
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 Antivir…
Vulnerability class: Buffer Overflow
EPSS: 0.001 (3.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Avast Antivirus — versions 8.3.70.94
- Gen Digital Avira Antivirus — versions 0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2025-8351?
- CVE-2025-8351 is a high-severity vulnerability in Avast Antivirus, classified under Heap-based Buffer Overflow. CVSS score: 7.8/10. Published 2025-12-01.
- How severe is CVE-2025-8351?
- High severity. CVSS v3 base score is 7.8 out of 10.