CVE-2025-3500

Integer Overflow in Avast Antiviurs 25.1.981.6 on Windows may result in privilege escalation

Published Dec 1, 2025 CVSS 3.1 · 9 Critical EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Solution

Upgrade to version 25.3 (or newer) released 01/APR/2025

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
CPEs cpe:2.3:a:avast:antivirus:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*
Type Values Removed Values Added
First Time appeared Avast
Avast antivirus
Microsoft
Microsoft windows
Vendors & Products Avast
Avast antivirus
Microsoft
Microsoft windows
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Integer Overflow in Avast Antiviurs 25.1.981.6 on Windows may result in privilege escalation
Weaknesses CWE-190
References
Metrics cvssV3_1

{'score': 9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
NLOK
Published
Updated
Feb 26, 2026, 4:57 PM
Reserved
Apr 10, 2025, 12:24 PM
Status
Analyzed
Published
Dec 1, 2025, 4:15 PM
Modified
Sep 26, 2026, 12:10 AM