How severe is CVE-2025-3500?

CVE-2025-3500 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-3500 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-3500?

CVE-2025-3500 affects Avast Antivirus. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-3500?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-3500 have an EU (EUVD) identifier?

Yes. CVE-2025-3500 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-200018.

When was CVE-2025-3500 published?

CVE-2025-3500 was published on 2025-12-01 and last updated on 2026-06-17.

CVE-2025-3500

CVE-2025-3500 is a critical-severity vulnerability in Avast Antivirus with a CVSS 3.x base score of 9.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-190.

Key facts

Severity: Critical (CVSS 3.x base score 9.0)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-200018
Weakness: CWE-190
Affected product: Avast Antivirus
Published: 2025-12-01
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2025-3500?: CVE-2025-3500 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-3500 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-3500?: CVE-2025-3500 affects Avast Antivirus. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-3500?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-3500 have an EU (EUVD) identifier?: Yes. CVE-2025-3500 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-200018.
When was CVE-2025-3500 published?: CVE-2025-3500 was published on 2025-12-01 and last updated on 2026-06-17.

References

https://www.gendigital.com/us/en/contact-us/security-advisories/

Affected products (1)

cpe:2.3:a:avast:antivirus:*:*:*:*:*:*:*:*

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