TOTOLINK X2000R: Stack-based buffer overflow in batchupg allows code execution
Summary
The batchupg component of the TOTOLINK X2000R home router contains a stack-based buffer overflow (CWE-121). An attacker who holds valid administrator credentials can send a specially crafted HTTP request to run arbitrary code on the device. Exploitation requires authentication, but the impact on the device is total.
Affected
- TOTOLINK X2000R, firmware TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327
- Other firmware versions: Unknown.
Fixed in
Unknown. No fixed firmware version has been confirmed by the vendor.
Workaround
- No vendor workaround known.
- Disable remote (WAN) management and keep the admin interface reachable only from the LAN.
- Restrict and review administrator accounts.
Exploitation
- No evidence of active exploitation found; not listed in KEV.
- CISA SSVC: Exploitation none, Automatable no, Technical Impact total.
- No public proof of concept found; EPSS 0.00946.
Our recommendation
- Confirm the firmware version of every X2000R in use.
- Disable WAN access to the router admin interface immediately.
- Set a unique, strong administrator password and remove unused accounts.
- Check TOTOLINK support pages regularly for a fixed firmware and apply it when available.
- Consider replacing the device if no fix is published.
- Also review CVE-2026-10135 (batchupg command injection) and CVE-2026-10141 on the same device.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Cisco Talos TALOS-2026-2434 talosintelligence.com
- NVD mirror: Vulners CVE-2026-10133 vulners.com
- OpenCVE CVE-2026-10133 app.opencve.io
- ThreatInt CVE-2026-10133 cve.threatint.com
- Strix CVE-2026-10133 www.strix.ai
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, 06:06.
Original description (NVD)
A stack-based buffer overflow vulnerability exists in the batchupg 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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