CVE-2026-42022

Deferred Deferred - Pending Action

Stack-Based Buffer Overflow in Totolink X2000R Firmware

Publication date: 2026-10-20

Last updated on: 2026-10-23

Assigner: Talos

Description

Multiple stack-based buffer overflow vulnerabilities exist in the boa formIpv6Setup static network configuration functionality of Totolink X2000R 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 these vulnerabilities. This vulnerability concerns the static_dns2 parameter.

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Meta Information

Published

2026-10-20

Last Modified

2026-10-23

Generated

2026-11-10

AI Q&A

2026-10-21

EPSS Evaluated

2026-11-08

NVD

CVE-2026-42022

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 vulnerability is a stack-based buffer overflow in the Totolink X2000R router's static network configuration. It exists in the formIpv6Setup function and is triggered by a specially crafted HTTP request to the static_dns2 parameter. An authenticated attacker can exploit this to execute arbitrary code on the device.

Detection Guidance

Detecting this vulnerability requires checking for vulnerable Totolink X2000R firmware versions and inspecting HTTP requests targeting the static_dns2 parameter. Monitor network traffic for malformed HTTP requests to the formIpv6Setup endpoint. Check device logs for unusual activity or crashes related to network configuration changes.

Impact Analysis

This vulnerability allows an authenticated attacker to execute arbitrary code on your Totolink X2000R router. This could lead to full device compromise, allowing the attacker to take control of your network, intercept traffic, or launch further attacks against other devices on your network.

Compliance Impact

This vulnerability allows arbitrary code execution via crafted HTTP requests, which could lead to unauthorized access or data breaches. Such breaches may violate GDPR's data protection requirements or HIPAA's safeguards for protected health information, depending on the affected system's use case.

Mitigation Strategies

Immediately update the Totolink X2000R firmware to the latest patched version. Disable remote or authenticated HTTP access if not required. Restrict network access to the device via firewalls or VLAN segmentation. Monitor for suspicious HTTP requests targeting the formIpv6Setup endpoint.

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