CVE-2025-3500
CWE-190Published: December 1, 2025· Updated: Jun 17, 2026
Official 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.
Risk Analysis
This critical integer overflow vulnerability in Avast Antivirus (25.1.981.6) on Windows allows for privilege escalation. With a CVSS score of 9.8, this flaw poses an extremely high risk, enabling an attacker to gain elevated permissions on an affected system.
No public exploit is currently known for this vulnerability. It is remotely exploitable without authentication, suggesting a wide potential for attack.
Users of Avast Antivirus should update to version 25.3 or later to remediate this vulnerability. Ensure all security software is kept up-to-date to prevent privilege escalation attacks.
Technical Analysis
CVE-2025-3500 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
All References (1)
Quick Facts
Related CVEs (CWE-190)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2025-3500 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts