What is the CVSS score of CVE-2025-5600?

CVE-2025-5600 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.5%.

Is there a public PoC exploit available for CVE-2025-5600?

Yes, a public proof-of-concept exploit is available for CVE-2025-5600. Prioritise patching immediately. EPSS: 0.5%.

How to fix or mitigate CVE-2025-5600?

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.

Ex1200t Firmware CVE-2025-5600

EUVD-2025-16902 CRITICAL

Buffer Overflow (CWE-119)

2025-06-04 cna@vuldb.com

Buffer Overflow TP-Link Ex1200t Firmware TOTOLINK

9.8

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-119 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, buffer size validation MITRE ATT&CK 2 techniques across 2 tactics: Execution, Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS 9.8.
Exploit ScenarioDerived	Overflow in language config for RCE.

Act Now Prioritize within 24-48h. Why: CRITICAL severity + public POC available.

No patch listed yet 0.5% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 14, 2026

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

Earlier versions of this analysis (1)

v1 Mar 14, 2026 - 17:29 CVSS 9.8

Buffer overflow in TOTOLINK EX1200T.

RemediationAI

Update firmware.

Affected VersionsENISA

EX1200T 4.1.2cu.5232_B20210713

Affected Packages

euvd ex1200t no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

CWE-119.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.8 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

PoC Detected

Jun 10, 2025 - 15:09 vuln.today

Public exploit code

CVE Published

Jun 04, 2025 - 18:15 nvd

CRITICAL 9.8

DescriptionCVE.org

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.

Executive ViewAI

Why It Matters

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. Organizations using this router model face immediate risk of network compromise, data theft, and lateral movement into connected systems.

Business Impact: Severe

Compensating Controls

Implement network access controls to restrict administrative access to the router via IP whitelisting; disable WAN-side access to /cgi-bin/cstecgi.cgi using firewall rules; deploy WAF rules to block requests containing stack-overflow payloads in the LangType parameter; segment the router from critical infrastructure using VLANs; monitor for exploitation attempts using IDS/IPS signatures; consider replacing with patched-device models or alternative vendors; disable remote management features if not operationally required.

Threat Intelligence Overview

EPSS Score

0.5%

Top 33% exploitable

Exploit

POC

Public exploit code exists

Data Quality

5 sources

Confidence: Medium

EUVD

NVD

CVE.org

EPSS

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC Yes

EPSS 0.5%

Patch available No

Active threat No

Deciding rule

CRITICAL severity + public POC available

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Out-of-Cycle

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact

Very High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +1

CVSS: +49

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.