How to fix EUVD-2025-16902?

Within 24 hours: Identify all TOTOLINK EX1200T 4.1.2cu.5232_B20210713 devices on your network using asset discovery tools and isolate affected devices from critical systems. Within 7 days: Implement network segmentation to restrict router access, apply WAF rules blocking requests to /cgi-bin/cstecgi.cgi with suspicious LangType parameters, and disable the setLanguageCfg function if possible through device configuration. Within 30 days: Contact TOTOLINK for patch availability status; if no patch is released, evaluate replacing affected devices with alternative router models from vendors with active security support, or implement proxy-based access controls to severely restrict administrative interfaces.

Is Ex1200t Firmware affected by EUVD-2025-16902?

A critical remote code execution vulnerability in TOTOLIK EX1200T routers allows unauthenticated attackers to gain complete system control through a buffer overflow exploit that is publicly available and actively exploitable.

EUVD-2025-16902

| CVE-2025-5600 CRITICAL

2025-06-04 [email protected]

9.8

CVSS 3.1

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 14, 2026 - 17:29 vuln.today

EUVD ID Assigned

Mar 14, 2026 - 17:29 euvd

EUVD-2025-16902

PoC Detected

Jun 10, 2025 - 15:09 vuln.today

Public exploit code

CVE Published

Jun 04, 2025 - 18:15 nvd

CRITICAL 9.8

Description

A vulnerability, which was classified as critical, has been found in TOTOLINK EX1200T 4.1.2cu.5232_B20210713. This issue affects the function setLanguageCfg of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument LangType leads to stack-based buffer overflow. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used.

Analysis

Buffer overflow in TOTOLINK EX1200T via setLanguageCfg. EPSS 0.52%. PoC available.

Technical Context

CWE-119.

Affected Products

['TOTOLINK EX1200T 4.1.2cu.5232']

Remediation

Update firmware.

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +0.5

CVSS: +49

POC: +20

EUVD-2025-16902 vulnerability details – vuln.today

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EUVD-2025-16902

CVSS Vector

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Description

Analysis

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EUVD-2025-16902

CVSS Vector

Lifecycle Timeline

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Description

Analysis

Technical Context

Affected Products

Remediation

Priority Score

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External POC / Exploit Code