What is the CVSS score of EUVD-2025-200018?

EUVD-2025-200018 has a CVSS 3.1 base score of 9.0 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Which versions of Windows are affected by EUVD-2025-200018?

Avast Antivirus versions 25.1.981.6 through 25.2.x contain a critical privilege escalation vulnerability (CVSS 9.0) that could allow local attackers to gain system-level access on Windows endpoints.. A patch is available.

How to fix or mitigate EUVD-2025-200018?

Within 24 hours: Identify all Windows systems running Avast Antivirus versions 25.1.981.6 through 25.2.x. Within 7 days: Deploy Avast Antivirus version 25.3 or later to all affected endpoints using your management console or automated patching. Within 30 days: Verify 100% remediation through inventory audit and confirm no systems remain on vulnerable versions.

Windows EUVD-2025-200018

| CVE-2025-3500 CRITICAL

Integer Overflow or Wraparound (CWE-190)

2025-12-01 security@nortonlifelock.com

Windows Privilege Escalation Integer Overflow Microsoft Antivirus

9.0

CVSS 3.1

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Updated

Apr 16, 2026 - 05:50 EUVD-patch-fix

executive_summary

Re-analysis Queued

Apr 16, 2026 - 05:29 backfill_euvd_patch

patch_released

Patch available

Apr 16, 2026 - 05:29 EUVD

25.3

EUVD ID Assigned

Mar 15, 2026 - 13:34 euvd

EUVD-2025-200018

Analysis Generated

Mar 15, 2026 - 13:34 vuln.today

CVE Published

Dec 01, 2025 - 16:15 nvd

CRITICAL 9.0

DescriptionNVD

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.

Analysis

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.

Technical ContextAI

An integer overflow occurs when an arithmetic operation produces a value that exceeds the maximum (or minimum) size of the integer type used to store it. This vulnerability is classified as Integer Overflow or Wraparound (CWE-190).

RemediationAI

Use safe integer arithmetic libraries. Check for overflow conditions before operations. Use appropriately sized integer types.

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EUVD-2025-200018 vulnerability details – vuln.today

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Windows EUVD-2025-200018

CVSS VectorNVD

Lifecycle Timeline

DescriptionNVD

Analysis

Technical ContextAI

RemediationAI

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External POC / Exploit Code