Which products and versions are affected by CVE-2025-34299?

Affected: Monsta FTP (Monstaftp). The full list is in the CVE brief.

Is CVE-2025-34299 being exploited in the wild?

It is exploited in the wild, listed in Industry KEV feed since Nov 26, 2025.

Is CVE-2025-34299 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2025-34299?

Public exploit code is available.

Is there a fix for CVE-2025-34299?

Fixed versions are available, including Monsta FTP <=2.11, Monsta FTP 2.11.

How urgently should CVE-2025-34299 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2025-34299

Q: What is CVE-2025-34299?

Monsta FTP versions 2.11 and earlier contain a vulnerability that allows unauthenticated arbitrary file uploads.

Q: How urgently should CVE-2025-34299 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CriticalExploitedPublic exploit

Monsta FTP versions 2.11 and earlier contain a vulnerability that allows unauthenticated arbitrary file uploads.

Published Nov 7, 2025 · Updated May 14, 2026

Key Facts

Patch immediately

CVE-2025-34299 is a critical-severity vulnerability (CVSS 9.3 v4) affecting Monsta FTP (Monstaftp).
It is exploited in the wild, listed in Industry KEV feed since Nov 26, 2025. Public exploit code is available.
EPSS estimates a 73% probability of exploitation in the next 30 days.
Fixed versions are available, including Monsta FTP <=2.11, Monsta FTP 2.11.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v4

9.3

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS (30-day exploit likelihood)

73%

Higher than 99.4% of all scored CVEs

Exploited in the wild

Yes

1 catalog listing

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2025-34299 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

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.

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
Industry KEV feed	Nov 26, 2025	n/a	Not reported

Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Affected Products

2 affected entries in total

Product	Affected versions	Fixed in
Monsta FTPMonstaftp	See advisory	2.11

Patched Releases

Monsta FTP

<=2.11

Timeline

Publicly disclosed
Nov 7, 2025
Added to Industry KEV feed
Nov 26, 2025
Last updated
May 14, 2026

Weakness Type

CWE-434 Unrestricted Upload of File with Dangerous Type

References

FAQ

Common Questions.

Monsta FTP versions 2.11 and earlier contain a vulnerability that allows unauthenticated arbitrary file uploads.
Affected: Monsta FTP (Monstaftp). The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Nov 26, 2025.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Monsta FTP <=2.11, Monsta FTP 2.11.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2025-34299 Running On Your Attack Surface?

Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.

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