What is CVE-2025-3500?

CVE-2025-3500 is a critical-severity vulnerability in Avast Antivirus, classified under Integer Overflow or Wraparound. CVSS score: 9.0/10. Published 2025-12-01.

How severe is CVE-2025-3500?

Critical severity. CVSS v3 base score is 9.0 out of 10.

Is CVE-2025-3500 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Integer overflow in Avast Antivirus

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.

Vulnerability class: Integer Overflow

EPSS: 0.005 (36.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H.

Affected products

Avast Antivirus — versions 25.1.981.6
Microsoft Windows

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

Public proof-of-concept exploits

chicken3962/CVE-2025-3500-Poc

References

security@nortonlifelock.com (Not Applicable)

Frequently asked questions

What is CVE-2025-3500?: CVE-2025-3500 is a critical-severity vulnerability in Avast Antivirus, classified under Integer Overflow or Wraparound. CVSS score: 9.0/10. Published 2025-12-01.
How severe is CVE-2025-3500?: Critical severity. CVSS v3 base score is 9.0 out of 10.
Is CVE-2025-3500 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.