How to fix or mitigate CVE-2025-4561?

Within 30 days: Identify all affected systems and apply vendor patches as part of regular patch cycle. Review file handling controls and restrict upload directories.

CVE-2025-4561

Q: What is the CVSS score of CVE-2025-4561?

CVE-2025-4561 has a CVSS 4.0 base score of 8.7 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 1.2%.

HIGH

Unrestricted Upload of File with Dangerous Type (CWE-434)

2025-05-12 twcert@cert.org.tw

RCE File Upload

8.7

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

8.7 HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 18:41 vuln.today

CVE Published

May 12, 2025 - 07:15 nvd

HIGH 8.7

DescriptionCVE.org

AnalysisAI

The KFOX from KingFor has an Arbitrary File Upload vulnerability, allowing remote attackers with regular privilege to upload and execute web shell backdoors, thereby enabling arbitrary code execution. Rated high severity (CVSS 8.7), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

Technical ContextAI

This vulnerability is classified as Unrestricted File Upload (CWE-434), which allows attackers to upload malicious files that can be executed on the server. The KFOX from KingFor has an Arbitrary File Upload vulnerability, allowing remote attackers with regular privilege to upload and execute web shell backdoors, thereby enabling arbitrary code execution on the server.

Affected ProductsAI

See vendor advisory for affected versions.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Validate file types server-side, store uploads outside webroot, use random filenames, scan for malware.