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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-3500
StatePUBLISHED
AssignerNLOK
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-01 16:15:53 UTC
Updated2026-09-26 00:10:00 UTC
DescriptionInteger 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 And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

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

EPSS: 0.004590000 probability, percentile 0.372510000 (date 2026-09-27)

Problem Types: CWE-190 | CWE-190 CWE-190 Integer Overflow or Wraparound

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1[email protected]Secondary9CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
3.1CNACVSS9CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Avast Antivirus All All All All
Operating System Microsoft Windows - All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Avast Antivirus affected 25.1.981.6 25.3 custom Windows

References

ReferenceSourceLinkTags
www.gendigital.com/us/en/contact-us/security-advisories [email protected] www.gendigital.com Not Applicable
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Baris Akkaya (en)

CNA: Trend Micro Zero Day Initiative (en)

Additional Advisory Data

Solutions

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

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