Unauthenticated code execution via downloadFile path control
Published Nov 7, 2025 · Updated Nov 7, 2025
Arbitrary file upload in Monsta FTP 2.11 and earlier allows remote attackers to execute code through a malicious SFTP server. The unauthenticated downloadFile action passes an attacker-controlled localPath to PHP copy(), writing a remote file anywhere the web process can access. The attacker must operate a reachable FTP or SFTP service; a PHP payload placed beneath the web root executes with the web server account.
Summary
What happened
Arbitrary file upload in Monsta FTP 2.11 and earlier allows remote attackers to execute code through a malicious SFTP server. The unauthenticated downloadFile action passes an attacker-controlled localPath to PHP copy(), writing a remote file anywhere the web process can access. The attacker must operate a reachable FTP or SFTP service; a PHP payload placed beneath the web root executes with the web server account.
The record
- CVE
- CVE-2025-34299
- Published
- Nov 7, 2025
- Updated
- Nov 7, 2025
- Vendor
- Monsta Limited of New Zealand
- Product
- Monsta FTP
- Classifications
- CWE-434, CAPEC-1, T1105
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 7, 2025CVE publishedPublication date reported by the CVE source.
- Nov 7, 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.
- Affected versionversion=0 <=2.11
What conditions does exploitation require?
What is affected?
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.
Weakness, pattern, technique
Public exploit references
- watchTowr downloadFile reproducerfunctional · demonstrated
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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