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01 Record

CVE-2025-4134

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

HighPUBLISHEDCNA: NLOK
CNA base score7.3 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

02 Description

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

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.21% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 12.2% of scored records. A rank, not a probability.
NVD base score
7.3 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
NVD analysis status
Deferred. NVD last modified this record on 2026-06-17.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2025-05-28 13:53Z1 YR AGO
Last updated
2025-05-28 14:06Z1 YR AGO
Reserved
2025-04-30
Assigning CNA
NLOK
Record state
PUBLISHED
Severity
High (CVSS 7.3)
CNA CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Weaknesses
  • CWE-552Files or Directories Accessible to External PartiesBase
Data version
5.1
Document digest
2d04106cc7807d5f2ada64610ecc29fda5154634132a721a7b66978ff61724cd

05 Affected products

VendorProductVersionsPlatforms

06 References

07 Remediation

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