What is the CVSS score of CVE-2025-6336?

CVE-2025-6336 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.6%.

Which versions of Ex1200t Firmware are affected by CVE-2025-6336?

A critical remote code execution vulnerability affects TOTOLINK EX1200T wireless routers (version 4.1.2cu.5232_B20210713) with no available patch.

Is there a public PoC exploit available for CVE-2025-6336?

Yes, a public proof-of-concept exploit is available for CVE-2025-6336. Prioritise patching immediately. EPSS: 0.6%.

How to fix or mitigate CVE-2025-6336?

Within 24 hours: Identify and inventory all TOTOLIK EX1200T devices in your environment and isolate them from critical networks if possible. Within 7 days: Evaluate replacement hardware or alternative network solutions; contact TOTOLINK for patch availability and timeline. Within 30 days: Execute migration plan to replace affected devices with patched or alternative equipment; implement enhanced network monitoring for any suspicious traffic to remaining devices.

Ex1200t Firmware CVE-2025-6336

EUVD-2025-18737 HIGH

Buffer Overflow (CWE-119)

2025-06-20 cna@vuldb.com

Buffer Overflow TP-Link RCE Ex1200t Firmware TOTOLINK

8.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.8 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

EUVD ID Assigned

Mar 15, 2026 - 00:19 euvd

EUVD-2025-18737

Analysis Generated

Mar 15, 2026 - 00:19 vuln.today

PoC Detected

Jun 26, 2025 - 18:28 vuln.today

Public exploit code

CVE Published

Jun 20, 2025 - 12:15 nvd

HIGH 8.8

DescriptionCVE.org

A vulnerability was found in TOTOLINK EX1200T 4.1.2cu.5232_B20210713. It has been classified as critical. Affected is an unknown function of the file /boafrm/formTmultiAP of the component HTTP POST Request Handler. The manipulation of the argument submit-url leads to buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.

AnalysisAI

CVE-2025-6336 is a critical buffer overflow vulnerability in TOTOLINK EX1200T wireless router (version 4.1.2cu.5232_B20210713) affecting the HTTP POST request handler. An authenticated attacker can exploit improper input validation on the 'submit-url' parameter in the /boafrm/formTmultiAP endpoint to achieve remote code execution with full system compromise (confidentiality, integrity, and availability). Public exploit code is available and the vulnerability has been disclosed; exploitation requires valid credentials but no user interaction.

Technical ContextAI

The vulnerability exists in the HTTP POST request handler component of TOTOLINK's web-based management interface. The /boafrm/formTmultiAP endpoint fails to properly validate the length of the 'submit-url' parameter before copying it to a fixed-size buffer, creating a classic CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) condition. This is a stack-based or heap-based buffer overflow in embedded router firmware that likely uses legacy C libraries without modern memory protections. The affected product CPE would be approximately 'cpe:2.3:h:totolink:ex1200t:4.1.2cu.5232_b20210713:*:*:*:*:*:*:*'. The firmware runs a basic web server (likely boa or similar) handling form submissions without adequate bounds checking.

RemediationAI

Vendor Patch: Monitor TOTOLINK security advisories and firmware download center for EX1200T updates newer than 4.1.2cu.5232_B20210713. Upgrade immediately when available.; link: https://www.totolink.net/ (vendor website—check support/download section) Workaround (Temporary): Restrict HTTP management access to trusted IP addresses via firewall rules or router access controls. Disable remote management if not required. Change default credentials immediately.; details: This reduces attack surface by limiting who can authenticate to the web interface. Mitigation: Isolate the router on a separate network segment or VPN; apply network-level access controls to the management port (typically 80/443). Monitor for suspicious POST requests to /boafrm/formTmultiAP.; details: Does not fix the vulnerability but limits exposure. Long-term: Consider replacing with a router from a vendor with more responsive security practices and longer firmware support lifecycle. TOTOLINK devices have a history of delayed or absent security patching.