# CVE-2026-42024: Totolink X2000R stack-based buffer overflow in formIpv6Setup

Source: https://junglewise.ai/threats/cve-2026-42024-multiple-stack-based-buffer-overflow-vulnerabilities-exist-in-the  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-20. Updated: 2026-10-20  
License: CC BY 4.0 with a link back

CVE-2026-42024 · Severity: critical · CVSS 9.1 · Published 2026-10-20

The Totolink X2000R is a budget gigabit home router that supports IPv6, WPA3, and mesh networking capabilities. Multiple stack-based buffer overflow vulnerabilities in the web-based network configuration interface allow an authenticated attacker to execute arbitrary code by sending specially crafted HTTP requests. An attacker with network access and valid credentials can gain complete control over the router, potentially compromising all connected devices and network traffic.

Technologies: [TOTOLINK X2000r](https://junglewise.ai/threats/technologies/x2000r). Vendors: [TOTOLINK](https://junglewise.ai/threats/vendors/totolink).

## Quick answers

**Is CVE-2026-42024 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-42024 being exploited in the wild.

**How severe is CVE-2026-42024?** 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-2026-42024?** 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-2026-42024 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-42024?** 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 handler within the boa web server on the X2000R, affecting parameters including static_dns1, static_dns2, and static_gw. The vulnerable code performs unsafe string operations (direct stack copies without bounds checking) on HTTP request parameters. An authenticated attacker can exploit these via a specially crafted HTTP request to execute arbitrary code with the privileges of the boa process.

## Affected products

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

## Timeline

- 2026-10-20: disclosed

## References

- [https://talosintelligence.com/vulnerability_reports/TALOS-2026-2395](https://talosintelligence.com/vulnerability_reports/TALOS-2026-2395)

## Related threats

- [TOTOLINK X2000R stack-based buffer overflow in formTR069Config](https://junglewise.ai/threats/cve-2026-9869-a-stack-based-buffer-overflow-vulnerability-exists-in-the-boa)
- [Totolink X2000R arbitrary file write in boa formUploadFile](https://junglewise.ai/threats/cve-2026-9827-a-arbitrary-file-write-vulnerability-exists-in-the-boa)
- [Totolink X2000R stack-based buffer overflow in boa formUploadFile](https://junglewise.ai/threats/cve-2026-9817-a-stack-based-buffer-overflow-vulnerability-exists-in-the-boa)
- [Totolink X2000R OS command injection in formWizard](https://junglewise.ai/threats/cve-2026-9814-an-os-command-injection-vulnerability-exists-in-the-boa-formwizard)
- [TOTOLINK X2000R stack-based buffer overflow in boa formFilter](https://junglewise.ai/threats/cve-2026-9660-multiple-exploitable-stack-based-buffer-overflow-vulnerabilities)