Is CVE-2026-9659 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-9659 being exploited in the wild.

How severe is CVE-2026-9659?

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-2026-9659?

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-2026-9659 attacked?

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

Am I affected by CVE-2026-9659?

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-2026-9659: TOTOLINK X2000R stack-based buffer overflow in boa formFilter

CVE-2026-9659 · Severity: critical · CVSS 9.1 · Published 2026-10-20

The TOTOLINK X2000R is a home router used for network connectivity and configuration. An authenticated attacker can send a specially crafted HTTP request containing the vpnUser parameter to the router's web interface, causing a stack-based buffer overflow that leads to arbitrary code execution. This allows an attacker with admin access to gain complete control of the router and compromise all connected devices.

Technologies: TOTOLINK X2000r. Vendors: TOTOLINK.

Quick answers

Is CVE-2026-9659 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-9659 being exploited in the wild.
How severe is CVE-2026-9659?: 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-2026-9659?: 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-2026-9659 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-9659?: 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 overflow vulnerabilities exist in the boa web server's formFilter functionality when processing HTTP POST parameters (addFilterIps, vpnUser, and related fields). The vulnerability requires prior authentication but no user interaction; an attacker sends a malicious POST request to /boafrm/formFilter with an oversized parameter value that overwrites the stack. Successful exploitation grants arbitrary code execution with router privileges.

Affected products

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

Timeline

2026-10-20: disclosed

References

https://talosintelligence.com/vulnerability_reports/TALOS-2026-2425

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