TOTOLINK X2000R: Stack-based buffer overflow in boa formTR069Config
Summary
A stack-based buffer overflow in the boa web management handler formTR069Config of the TOTOLINK X2000R home router can be triggered by a crafted HTTP request. An attacker with valid credentials for the web interface can use it to execute arbitrary code on the device, with a CVSS 3.1 score of 9.1. The CVSS vector assumes high privileges (PR:H), and no fix or vendor advisory is available yet.
Affected
- TOTOLINK X2000R, firmware TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 (the only version listed in the sources)
Fixed in
Unknown.
Workaround
- No vendor-specific workaround is known.
- Restrict access to the web and TR-069 management interface to trusted networks only and do not expose it on the WAN.
- Change default and weak administrator passwords.
- Check whether TR-069 remote management is enabled and disable it if it is not needed.
Exploitation
- CISA SSVC rates exploitation as "none" and automatable as "no".
- No public proof of concept or exploit was found in the research.
- The CVE is not listed in CISA KEV.
Our recommendation
- Identify all TOTOLINK X2000R devices and confirm the firmware version.
- Check whether the management interface or TR-069 is reachable from the internet and close access if it is.
- Change all administrator passwords.
- Check the TOTOLINK support site regularly for a firmware fix and follow the Talos and NVD entries for updates.
- Priority: high if the device is internet-facing or uses default credentials, otherwise medium.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Cisco Talos TALOS-2026-2431 talosintelligence.com
- Cisco Talos TALOS-2026-2439 (sibling report, same device) talosintelligence.com
- OpenCVE CVE-2026-9869 app.opencve.io
- Strix CVE-2026-9869 www.strix.ai
- Vulners Talos TALOS-2026-2431 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, 05:51.
Original description (NVD)
A stack-based buffer overflow vulnerability exists in the boa formTR069Config 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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