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

7.3 CVSS

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.

Classification

CVE ID: CVE-2025-4134

CVSS Base Severity: HIGH

CVSS Base Score: 7.3

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

Problem Types

CWE-552 Files or Directories Accessible to External Parties

Affected Products

Vendor: Avast

Product: Avast Business Antivirus

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.01% (probability of being exploited)

EPSS Percentile: 1.4% (scored less or equal to compared to others)

EPSS Date: 2025-06-08 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-4134
https://www.gendigital.com/us/en/contact-us/security-advisories/

Timeline