TOTOLINK X2000R: Arbitrary file write in boa formUploadFile
Summary
The boa web management interface of the TOTOLINK X2000R router contains an arbitrary file write vulnerability in the formUploadFile handler. An attacker with valid administrative credentials can send a specially crafted HTTP request that writes files to attacker-chosen paths, which can lead to arbitrary code execution on the device. Exploitation requires authentication, and the CVSS vector requires high privileges (PR:H).
Affected
- TOTOLINK X2000R, firmware TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 (confirmed by Cisco Talos)
- Other firmware versions: Unknown.
Fixed in
Unknown.
Workaround
- No CVE-specific workaround is known.
- Remove any WAN-side access to the router administration interface.
- Restrict administrative access to a dedicated management network.
- Replace default administrator credentials.
Exploitation
- CISA SSVC assessment: exploitation none, not automatable.
- Not listed in CISA KEV.
- No public proof-of-concept or exploitation reports were found at the time of research.
Our recommendation
- Inventory all TOTOLINK X2000R devices and confirm the firmware version.
- Remove WAN access to the admin interface and restrict it to a management VLAN.
- Replace default or weak passwords with strong, unique credentials.
- Monitor TOTOLINK and the Cisco Talos advisory TALOS-2026-2430 for a firmware fix and apply it as soon as it is available.
- Review device logs for unexpected administrative requests.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Cisco Talos TALOS-2026-2430 talosintelligence.com
- OpenCVE CVE-2026-9827 app.opencve.io
- Vulners Talos TALOS-2026-2430 vulners.com
- Strix CVE-2026-9827 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, 05:51.
Original description (NVD)
A arbitrary file write vulnerability exists in the boa formUploadFile 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.
Affected? We can help.
We check whether your systems are affected, install updates and close the gap – continuously with the System Health Checker if you wish.