CVE-2025-34299: Monsta FTP versions 2.11 and earlier contain a vulnerability that allows unauthenticated arbitrary file upload

Q: How do I fix CVE-2025-34299?

monsta ftp: upgrade to newer than 2.11. Exact commands for each OS are on this page.

Q: Is CVE-2025-34299 being exploited?

CVE-2025-34299 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-34299 affect?

CVE-2025-34299 affects monsta ftp. Severity is critical (CVSS 9.8). 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.

Q: How urgent is CVE-2025-34299?

Priority 72/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2025-34299 is a critical-severity flaw (CVSS 9.8) affecting monsta ftp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	72.7% (top 1%)
CISA exploited list	No
Weakness	CWE-434
Published	2025-11-07
Last modified	2026-10-18

Publisher (CNA): VulnCheck · Vendor: monstaftp

Last updated 2026-10-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-11-07 14:15 UTCPublished CVE record published
2026-10-18 21:10 UTCUpdated Record last modified

monstaftp monsta ftp UPGRADE

Affected: <= 2.11

Fixed in: newer than 2.11

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy monsta-ftp || rpm -q monsta-ftp || monsta-ftp --version

2. UPGRADE to newer than 2.11 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade monsta-ftp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade monsta-ftp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora ELN · jgmenu · FIXED · 4.7.0-1.eln159 · FEDORA-2026-40fa69cb49 · source

sudo dnf upgrade --advisory=FEDORA-2026-40fa69cb49

Fedora 46 · trustedqsl · FIXED · 2.8.7-1.fc46 · FEDORA-2026-6b1bc90ebc · source

sudo dnf upgrade --advisory=FEDORA-2026-6b1bc90ebc

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: Chocapikk/CVE-2025-34299 (5 stars)
GitHub PoC: rxerium/CVE-2025-34299 (0 stars)
GitHub PoC: KrE80r/CVE-2025-34299-lab (0 stars)
Write-up: labs.watchtowr.com/whats-that-coming-over-the-hill-monsta-ftp-remote-code-execution-cve-20
Metasploit: Monsta FTP downloadFile Remote Code Execution
Nuclei scan template: Monsta FTP <= 2.11.2 - Unauthenticated Remote Code Execution

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-34299?

monsta ftp: upgrade to newer than 2.11. Exact commands for each OS are on this page.

Is CVE-2025-34299 being exploited?

CVE-2025-34299 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-34299 affect?

CVE-2025-34299 affects monsta ftp. Severity is critical (CVSS 9.8). 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.

How urgent is CVE-2025-34299?

Priority 72/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

References

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