What’s Vulnerable › Vulnerabilities
CVE-2025-10101: Avast antivirus heap buffer OOB read when scanning a malformed Mach-O file
- Severity: high (CVSS 7.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-12-01 · updated 2026-09-26
- Weakness: CWE-125
Description
Heap buffer out-of-bounds read vulnerability in Avast Antivirus when scanning a malformed Mach-O file may allow Local Execution of Code or Denial-of-Service of the antivirus process. This issue affects Avast Antivirus, AVG Antivirus, Norton Antivirus, Avast One, and Avast Business Antivirus on Windows, macOS, and Linux for virus definition builds before VPS 25090300. The affected scanning logic is delivered through a shared Gen Digital virus definition update stream. The same stream feeds the consumer antivirus products listed in this advisory and other Gen Digital products that embed the same engine. Mitigation flows through this update channel; installations at or above the listed build are not vulnerable regardless of which product consumes the stream.
Affected products
- Gen Digital Avast Antivirus: before 25090300 — fixed in 25090300
- Gen Digital Avast Business Antivirus: before 25090300 — fixed in 25090300
- Gen Digital Avast One: before 25090300 — fixed in 25090300
- Gen Digital AVG Antivirus: before 25090300 — fixed in 25090300
- Gen Digital Norton Antivirus: before 25090300 — fixed in 25090300
How to fix
Upgrade to a fixed version: Gen Digital Avast Antivirus 25090300; Gen Digital Avast Business Antivirus 25090300; Gen Digital Avast One 25090300; Gen Digital AVG Antivirus 25090300; Gen Digital Norton Antivirus 25090300. Check the vendor advisory for mitigations.
References
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