How severe is CVE-2025-4134?

CVE-2025-4134 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-4134 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-4134?

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

Does CVE-2025-4134 have an EU (EUVD) identifier?

Yes. CVE-2025-4134 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16299.

When was CVE-2025-4134 published?

CVE-2025-4134 was published on 2025-05-28 and last updated on 2026-06-17.

CVE-2025-4134

CVE-2025-4134 is a high-severity vulnerability with a CVSS 3.x base score of 7.3. 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-552.

Key facts

Severity: High (CVSS 3.x base score 7.3)
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-16299
Weakness: CWE-552
Published: 2025-05-28
Last modified: 2026-06-17

Description

Lack of file validation in do_update_vps in Avast Business Antivirus for Linux 4.5 on Linux allows local user to spoof or tamper with the update file via an unverified file write.

Frequently asked questions

What is CVE-2025-4134?: Lack of file validation in do_update_vps in Avast Business Antivirus for Linux 4.5 on Linux allows local user to spoof or tamper with the update file via an unverified file write.
How severe is CVE-2025-4134?: CVE-2025-4134 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-4134 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-4134?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-4134 have an EU (EUVD) identifier?: Yes. CVE-2025-4134 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16299.
When was CVE-2025-4134 published?: CVE-2025-4134 was published on 2025-05-28 and last updated on 2026-06-17.

References

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

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