Is CVE-2026-42025 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-42025 being exploited in the wild.

How severe is CVE-2026-42025?

Critical severity, with a CVSS score of 9.1, published 20 October 2026.

Which products and versions are affected?

TOTOLINK X2000r TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327.

Is there a fix for CVE-2026-42025?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-42025 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-42025?

Check whether you run TOTOLINK X2000r at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-42025: Totolink X2000R stack-based buffer overflow in formIpv6Setup

CVE-2026-42025 · Severity: critical · CVSS 9.1 · Published 2026-10-20

The Totolink X2000R is a home router used for internet connectivity and network management. Multiple stack-based buffer overflow vulnerabilities in its web administration interface allow an authenticated attacker to execute arbitrary code by sending specially crafted HTTP requests to the IPv6 setup functionality. This could give an attacker complete control over the router, enabling data theft, network monitoring, or use as a pivot point for attacks on connected devices.

Technologies: TOTOLINK X2000r. Vendors: TOTOLINK.

Quick answers

Is CVE-2026-42025 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-42025 being exploited in the wild.
How severe is CVE-2026-42025?: Critical severity, with a CVSS score of 9.1, published 20 October 2026.
Which products and versions are affected?: TOTOLINK X2000r TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327.
Is there a fix for CVE-2026-42025?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-42025 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-42025?: Check whether you run TOTOLINK X2000r at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

Multiple stack-based buffer overflows exist in the formIpv6Setup function of the boa web server, specifically in the dhcp_dns1 and dhcp_dns2 parameters which are copied to the stack via strcpy() without bounds checking. An authenticated attacker can trigger these via HTTP POST requests to /boafrm/formIpv6Setup with wan_enable=1, OriginType=2, and an oversized dhcp_dns1 or dhcp_dns2 parameter to overflow the stack and achieve arbitrary code execution. The vulnerability is confirmed present in firmware version TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327.

Affected products

Totolink X2000R TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327

Timeline

2026-10-20: disclosed: Advisory published by Cisco Talos

References

https://talosintelligence.com/vulnerability_reports/TALOS-2026-2396

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