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CVE-2025-3500

Avast Antivirus integer overflow

9.0 CRITICALEPSS 0.46%
  1. Published1 Dec 2025

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Affected products

Avast Antivirus≥ 25.1.981.6 < 25.3

Remediation

Fixed in
Avast Antivirus≥ 25.3

References

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Frequently asked

Is CVE-2025-3500 being actively exploited?

CVE-2025-3500 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.46%.

How severe is CVE-2025-3500?

CVE-2025-3500 has a CVSS 3.1 base score of 9.0, rated critical. EPSS estimates a 0.46% probability of exploitation.

Which products are affected by CVE-2025-3500?

Affected products include Avast Antivirus.

How do I fix CVE-2025-3500?

Upgrade affected software to a fixed version, for example Avast Antivirus 25.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-3500 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.