TOTOLINK X2000R: Stack-based buffer overflow in boa formUpload()
Summary
A stack-based buffer overflow in the boa web administration component of the TOTOLINK X2000R router allows arbitrary code execution. An attacker must first authenticate and then send a specially crafted HTTP request to the upload functionality. The CVSS score is 9.1 (critical) because of the high impact on confidentiality, integrity and availability, but exploitation requires valid credentials.
Affected
- TOTOLINK X2000R, firmware TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 (the only version listed by the CNA)
Fixed in
Unknown. No fixed firmware has been published.
Workaround
Unknown. No vendor mitigation is documented. Interim measures:
- Disable remote management and WAN access to the admin interface.
- Restrict admin access to trusted LAN hosts.
- Change default or weak admin passwords.
- Monitor for unexpected configuration or firmware changes.
Exploitation
- CISA SSVC: exploitation none, not automatable.
- Not listed in the CISA KEV catalogue.
- No public proof of concept found.
Our recommendation
- Inventory X2000R devices and check whether remote management is enabled.
- Remove any internet exposure of the admin interface.
- Ask TOTOLINK for an advisory and a fixed firmware; apply it once available.
- Replace the device if no fix is provided.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Cisco Talos report TALOS-2026-2437 talosintelligence.com
- OpenCVE: CVE-2026-10137 app.opencve.io
- Strix: CVE-2026-10137 www.strix.ai
- Vulners mirror of TALOS-2026-2437 vulners.com
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, 06:08.
Original description (NVD)
A stack-based buffer overflow vulnerability exists in the boa formUpload() 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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