Vulnerability · Published Dec 1, 2025 · Assigned by NLOK
CVE-2025-8351Avira antivirus engine heap buffer OOB read when scanning a malformed file
High 7.8
In plain English
A high-severity heap buffer overflow in Avira Antivirus from Gen Digital. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).
Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.2%top 92.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Gen Digital | Avira Antivirus | 0 – before 8.3.70.98 |
Weakness: CWE-122, CWE-125 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H