CVE-2026-42019

Deferred Deferred - Pending Action

Stack-Based Buffer Overflow in Totolink X2000R Firmware

Publication date: 2026-10-20

Last updated on: 2026-10-28

Assigner: Talos

Description

Multiple stack-based buffer overflow vulnerabilities exist in the boa formIpv6Setup pppoe 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 pppoe_dns1 parameter.

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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

2026-11-09

NVD

CVE-2026-42019

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 Totolink X2000R firmware affecting the pppoe_dns1 parameter. It allows authenticated attackers to send crafted HTTP requests that trigger overflows, leading to arbitrary code execution.

Detection Guidance

Detecting this vulnerability requires checking for vulnerable Totolink X2000R firmware versions and monitoring HTTP requests targeting the pppoe_dns1 parameter. Inspect network traffic for malformed requests to the formIpv6Setup endpoint. Use tools like Wireshark or tcpdump to capture and analyze HTTP traffic for suspicious payloads.

Impact Analysis

An attacker could exploit this to gain control of the device, steal data, or launch further attacks. Since it requires authentication, attackers need valid credentials but could escalate privileges or bypass security controls.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR and HIPAA requirements for data protection and confidentiality. Organizations may face compliance penalties if exploited.

Mitigation Strategies

Immediately update the Totolink X2000R firmware to the latest patched version. If no patch is available, restrict access to the device's web interface via network segmentation or firewall rules. Disable unnecessary services like PPPoE if not required. Monitor logs for unauthorized HTTP requests to formIpv6Setup.

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