CVE-2025-3381Public exploitNetwork attack vector

Authenticated arbitrary file write via crafted upload ID

Published Apr 7, 2025 · Updated Apr 8, 2025

Path traversal in Youkefu 4.2.0 allows remote authenticated users to write uploaded files outside the intended directory via a crafted ID. The File Upload code in WebIMController.java uses the attacker-controlled ID to construct an upload path without restricting parent-directory traversal. A valid low-privilege session is required, and the demonstrated consequence is an arbitrary file write rather than proven code execution.

CVSS severity5.3
Medium
EPSS probability1.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Youkefu 4.2.0 allows remote authenticated users to write uploaded files outside the intended directory via a crafted ID. The File Upload code in WebIMController.java uses the attacker-controlled ID to construct an upload path without restricting parent-directory traversal. A valid low-privilege session is required, and the demonstrated consequence is an arbitrary file write rather than proven code execution.

The record

CVE
CVE-2025-3381
Published
Apr 7, 2025
Updated
Apr 8, 2025
Vendor
Zhangyanbo2007
Product
Youkefu
Classifications
CWE-22, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Zhangyanbo2007 · Youkefuversion=4.2.0

Published CVSS scores

5.3VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P
6.3VulDBCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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