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.
Published: 2026-10-20
Score: 9.1 Critical
EPSS: < 1% Very Low
KEV: No
Impact: Remote Code Execution
Action: Apply Patch
AI Analysis

Impact

Multiple stack-based buffer overflows exist in the boa formFilter of the X2000R router. A specially crafted HTTP request that includes the vpnUser parameter can trigger arbitrary code execution. The flaw is a classic stack overflow (CWE‑121) and can be exploited by an authenticated attacker, allowing them to take complete control of the device, compromising confidentiality, integrity, and availability.

Affected Systems

The affected product is the Totolink X2000R router, firmware version TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327. No other versions are listed as affected.

Risk and Exploitability

This vulnerability has a high CVSS score of 9.1, indicating a severe impact if exploited. EPSS data is not available, and it is not listed in CISA’s KEV catalog. The likely attack vector is a remote HTTP request; an attacker must first obtain authenticated access—either through legitimate credentials, credential compromise, or social engineering—to trigger the overflow. Once triggered, arbitrary code execution is possible, providing remote control over the device.

Generated by OpenCVE AI on October 20, 2026 at 22:38 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply vendor‑published firmware update that addresses the boa formFilter buffer overflow.
  • Restrict remote web interface access to trusted IP ranges or disable it if not required.
  • Monitor the router’s logs for abnormal authentication attempts and block suspicious IPs.

Generated by OpenCVE AI on October 20, 2026 at 22:38 UTC.

Tracking

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Advisories

No advisories yet.

History

Wed, 28 Oct 2026 22:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Wed, 21 Oct 2026 17:15:00 +0000

Type Values Removed Values Added
First Time appeared Totolink
Totolink x2000r
Vendors & Products Totolink
Totolink x2000r

Tue, 20 Oct 2026 23:00:00 +0000

Type Values Removed Values Added
Title Stack-Based Buffer Overflow in Totolink X2000R boa formFilter Allows Remote Code Execution

Tue, 20 Oct 2026 20:45:00 +0000

Type Values Removed Values Added
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.
Weaknesses CWE-121
References
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H'}

Subscriptions

Totolink X2000r
cve-icon MITRE

Status: PUBLISHED

Assigner: talos

Published:

Updated: 2026-10-28T20:05:44.804Z

Reserved: 2026-05-26T21:49:56.433Z

Link: CVE-2026-9659

cve-icon Vulnrichment

Updated: 2026-10-28T17:53:02.809Z

cve-icon NVD

Status : Deferred

Published: 2026-10-20T21:17:22.410

Modified: 2026-10-28T20:18:53.737

Link: CVE-2026-9659

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-21T16:44:08Z

Weaknesses
  • CWE-121

    Stack-based Buffer Overflow