CVE-2025-9033: Avira antivirus engine heap buffer OOB read when scanning a malformed PDF file (variant 3)

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-12 · updated 2026-07-23
Weakness: CWE-125

Description

Heap buffer out-of-bounds read vulnerability in Avira Antivirus engine when scanning a malformed PDF 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 8.3.70.76.

Affected products

Gen Digital Avira Antivirus: before 8.3.70.76 — fixed in 8.3.70.76

How to fix

Upgrade to a fixed version: Gen Digital Avira Antivirus 8.3.70.76. Check the vendor advisory for mitigations.

References

https://www.gendigital.com/us/en/contact-us/security-advisories/

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