Summary
generated automatically from NVD dataCVE-2026-9659 is a stack-based buffer overflow (CWE-121) in the boa web server's formFilter functionality on the TOTOLINK X2000R, reported for firmware TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327. The flaw is tied to the vpnUser parameter, and an authenticated attacker sending a specially crafted HTTP request could achieve arbitrary code execution. It is rated CRITICAL with a CVSS v3.1 score of 9.1.
NVD description
Multiple exploitable stack-based buffer overflow vulnerabilities exist in the boa formFilter 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 these vulnerabilities. This vulnerability deals with the vpnUser parameter.
EPSS · FIRST.org
0.79%probability of exploitation in the next 30 days
Higher than 55% of scored CVEs
EPSS (Exploit Prediction Scoring System) estimates, from observed exploitation activity, how likely a CVE is to be exploited in the next 30 days. It complements CVSS, which measures severity, not likelihood. Score of 2026-10-21, recomputed daily by FIRST.org.
In-depth analysis on cveo.tech
We've published a detailed analysis of this CVE — exploitation, IOCs and mitigation.
CVSS v3.1 Score
Information
- Published
- 20 oct. 2026
- Updated
- 20 oct. 2026
- Status
- Received
- Source
- talos-cna@cisco.com
Weaknesses (CWE)
Similar CVEs
Other vulnerabilities of type CWE-121
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