CVE-2025-8351
High
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.
SeverityHigh
CVSS7.8
Exploit probability—
ProductAvira Antivirus
PublishedDec 1, 2025
First seenDec 1, 2025
Weakness typeCWE-122CWE-122CWE-125Out-of-bounds read
How to fix
Update
- Gen Digital Avira Antivirus8.3.70.98 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Gen Digital Avira Antivirus | v < 8.3.70.98 | 8.3.70.98 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.