CVE-2026-40615

Deferred Deferred - Pending Action

Stack-Based Buffer Overflow in TOTOLINK X2000R Router

Publication date: 2026-10-20

Last updated on: 2026-10-28

Assigner: Talos

Description

A stack-based buffer overflow vulnerability exists in the boa formParentControl deviceName functionality of X2000R (version(s): TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327). A specially crafted HTTP request can lead to arbitrary code execution. An attacker can make an authenticated HTTP request to trigger this vulnerability.

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Meta Information

Published

2026-10-20

Last Modified

2026-10-28

Generated

2026-11-10

AI Q&A

2026-10-21

EPSS Evaluated

2026-11-08

NVD

CVE-2026-40615

Affected Vendors & Products

Vendor	Product	Version / Range
totolink	Totolink	TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-121	A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

Attack-Flow Graph

Executive Summary

This is a stack-based buffer overflow vulnerability in the TOTOLINK X2000R router firmware. It exists in the formParentControl deviceName functionality and can be triggered by a specially crafted HTTP request. Successful exploitation allows arbitrary code execution, meaning an attacker could run malicious code on the device.

Detection Guidance

Detecting this vulnerability requires checking for vulnerable TOTOLINK X2000R devices on your network. Inspect HTTP traffic for malformed requests targeting the formParentControl deviceName parameter. Use network scanning tools like Nmap to identify devices running the affected firmware version TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327.

Impact Analysis

If exploited, this vulnerability could allow an attacker to take control of your TOTOLINK X2000R router. This could lead to network compromise, data theft, or the device being used as part of a botnet. Attackers need authentication but can exploit it via HTTP requests.

Compliance Impact

This vulnerability could potentially lead to unauthorized access or data breaches due to arbitrary code execution, which may violate compliance requirements under GDPR or HIPAA if sensitive data is exposed or compromised.

Mitigation Strategies

Immediately update the TOTOLINK X2000R firmware to the latest patched version if available. If no patch exists, restrict access to the device's web interface via network segmentation or firewall rules. Disable unauthenticated HTTP access and enforce strong authentication for all administrative interfaces.

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