TOTOLINK X2000R: Stack-based buffer overflow in boa formParentControl
Summary
The boa web management interface of the TOTOLINK X2000R router contains a stack-based buffer overflow in the formParentControl function, triggered via the deviceName parameter. An attacker who sends a specially crafted HTTP request after authenticating can execute arbitrary code on the device. The vector assumes high privileges (PR:H), which limits how easily the flaw can be exploited, but a compromised or exposed admin interface would allow full control of the router.
Affected
- TOTOLINK X2000R, firmware TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327
- Other firmware versions: Unknown.
Fixed in
Unknown.
Workaround
- No vendor workaround is documented in the CVE record.
- Disable remote (WAN) administration.
- Restrict access to the web administration interface to trusted LAN hosts or a management VLAN.
- Change default administrator credentials to unique, strong passwords.
Exploitation
- CISA KEV: not listed.
- Exploited in the wild: no evidence found.
- Public proof of concept: none found.
- CISA SSVC: Exploitation none, Automatable no, Technical Impact total.
- EPSS at the time of research: 0.00737 (not verified against the official source).
Our recommendation
- Check whether any TOTOLINK X2000R is in use and whether its web administration is reachable from the internet.
- Disable remote administration and restrict access to trusted LAN hosts.
- Change default and shared administrator passwords.
- Check the TOTOLINK website for a fixed firmware and apply it as soon as it is available; if no fix is published, plan to replace the device.
- Also review CVE-2026-41222, which affects the same product through the formParentControl function.
- Monitor the router for unexpected configuration changes or outbound connections.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Cisco Talos TALOS-2026-2393 talosintelligence.com
- OpenCVE CVE-2026-40615 app.opencve.io
- Strix CVE-2026-40615 www.strix.ai
- Vulners Talos TALOS-2026-2393 vulners.com
- OpenCVE CVE-2026-41222 app.opencve.io
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 31 Oct 2026, 06:03.
Original description (NVD)
A stack-based buffer overflow vulnerability exists in the boa formParentControl deviceName functionality of X2000R (version(s): 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 this vulnerability.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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