CVE-2025-4134

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

HIGH

7.3

CVSS Score

Published: May 28, 2025 at 01:53 PM UTC

Updated: June 17, 2026 at 09:32 AM UTC

1 product affected across 1 vendorBusiness Antivirus

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Severity

HIGH7.3

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Business Antivirus · Avast

60%

4.5.1

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Source: [email protected]

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.3HIGHNLOK

Attack Vector: LOCAL
Complexity: LOW
Privileges: LOW
User Interaction: REQUIRED
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-552

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