CVE-2022-3939Network attack vector

Arbitrary file write via unsanitized upload filename

Published Nov 11, 2022 · Updated Apr 15, 2025

Path traversal in the upload API in lanyulei Ferry allows remote authenticated users to write files outside the upload directory. UploadFile concatenates each multipart filename with the static upload directory and passes the result to SaveUploadedFile without rejecting parent-directory segments. A valid low-privilege session is the published gate; successful traversal can overwrite files writable by the service account.

CVSS severity6.3
Medium
EPSS probability0.60%
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 the upload API in lanyulei Ferry allows remote authenticated users to write files outside the upload directory. UploadFile concatenates each multipart filename with the static upload directory and passes the result to SaveUploadedFile without rejecting parent-directory segments. A valid low-privilege session is the published gate; successful traversal can overwrite files writable by the service account.

The record

CVE
CVE-2022-3939
Published
Nov 11, 2022
Updated
Apr 15, 2025
Vendor
lanyulei
Product
Ferry
Classifications
CWE-22, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 11, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 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=n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

lanyulei · Ferryversion=n/a

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.3VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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