CVE-2025-3500

CRITICAL

Published Dec 1, 2025 Modified Feb 6, 2026 CWE-190

Description

Integer Overflow or Wraparound vulnerability in Avast Antivirus (25.1.981.6) on Windows allows Privilege Escalation.This issue affects Antivirus: from 25.1.981.6 before 25.3.

CVSS v3.1 Score

9.0

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Weakness Type (CWE)

CWE-190 Integer Overflow

Affected Products

Vendor	Product	Versions
avast	antivirus	25.1.981.6 — 25.3
microsoft	windows	All

References

Other References

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

Frequently Asked Questions

What is CVE-2025-3500? +

Integer Overflow or Wraparound vulnerability in Avast Antivirus (25.1.981.6) on Windows allows Privilege Escalation.This issue affects Antivirus: from 25.1.981.6 before 25.3. It has a CVSS v3.1 base score of 9.0 (CRITICAL).

How severe is CVE-2025-3500? +

CVE-2025-3500 has a CVSS v3.1 score of 9.0 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-3500? +

CVE-2025-3500 affects products from avast, microsoft, specifically: antivirus, windows. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-3500? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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