---
title: "CVE-2026-42025: TOTOLINK X2000R - Remote Code Execution"
description: "TOTOLINK X2000R TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 contains a stack-based buffer overflow caused by improper handling of dhcp_dns1 parameter in boa formIpv6Setup dhcp_dns functionality, letting authenticated attackers execute arbitrary code remotely, exploit requires authenticated HTTP request."
url: https://panop.io/threat-heartbeat/CVE-2026-42025/
---

# CVE-2026-42025 TOTOLINK X2000R - Remote Code Execution

TOTOLINK X2000R TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 contains a stack-based buffer overflow caused by improper handling of dhcp\_dns1 parameter in boa formIpv6Setup dhcp\_dns functionality, letting authenticated attackers execute arbitrary code remotely, exploit requires authenticated HTTP request.

CVSS base score 9.1 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-42025)

## Details

Type

Remote Code Execution

Impact

Remote Code Execution

CVSS vector

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

Published

20 October 2026

Updated

21 October 2026

Weakness

[CWE-121](https://cwe.mitre.org/data/definitions/121.html)

## Vendor fix

Update to the latest firmware version available for TOTOLINK X2000R.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-42025](https://nvd.nist.gov/vuln/detail/CVE-2026-42025)
- [https://talosintelligence.com/vulnerability\_reports/TALOS-2026-2396](https://talosintelligence.com/vulnerability_reports/TALOS-2026-2396)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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