CVE-2025-4134 HIGH

CVE-2025-4134: Lack of file validation in Avast Business Antivirus for Linux allows writing untrusted update files

Vendor Avast
Product Avast Business Antivirus
Weakness CWE-552 · Files accessible externally
Published May 28, 2025
Last update May 28, 2025
View on NVD All CVEs

CVSS base score

7.3/10
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction Required
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 28, 2025 CVE published
May 28, 2025 Record updated