CVE-2025-4134

Lack of file validation in Avast Business Antivirus for Linux allows writing untrusted update files

Published May 28, 2025 CVSS 3.1 · 7.3 High EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Solution

Fixed in V4.6 released 03/FEB/2025, ugrade to latest version.

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2025-16299 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.
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Lack of file validation in Avast Business Antivirus for Linux allows writing untrusted update files
Weaknesses CWE-552
References
Metrics cvssV3_1

{'score': 7.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H'}

Subscriptions

No data.

Weaknesses

Sources

Status
PUBLISHED
Assigner
NLOK
Published
Updated
May 28, 2025, 2:06 PM
Reserved
Apr 30, 2025, 12:38 PM
Status
Deferred
Published
May 28, 2025, 2:15 PM
Modified
Jun 17, 2026, 9:32 AM