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9.8

Avast Antivirus on Windows: Privilege Escalation Risk with Outdated Version

CVE-2025-3500 · published 11 months ago
Summary

Avast Antivirus versions 25.1.981.6 to 25.3 on Windows may allow an attacker to gain elevated access to the system. This is a serious issue that requires immediate attention, especially for businesses and organizations that rely on Avast Antivirus for protection. Update Avast Antivirus to the latest version to resolve this vulnerability.

What to do
  • Update avast antivirus to version 25.3 or later.
Affected software
VendorProductAffected versions
avast antivirus >= 25.1.981.6, < 25.3
cpe:2.3:a:avast:antivirus:*:*:*:*:*:*:*:*
Original advisory text
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.
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.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
9.8 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-190Integer Overflow
Timeline
Published1 Dec 2025
Updated4 Nov 2026
First seen6 Mar 2026
Sources
CVE-2025-3500 · NVD
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