CVE-2026-51731: n/a
Description
Incorrect access control in the delVlanCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to remove VLAN entries via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
CVSS v3.1
Score 9.1critical
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability arises from improper access control in the delVlanCfg function of TOTOLINK T6 firmware 4.1.5cu.748_B20211015. An attacker can exploit this by sending a specially crafted POST request to the /cgi-bin/cstecgi.cgi endpoint, which allows removal of VLAN entries without requiring authentication. The CVSS v3.1 score is 9.1 (critical), reflecting the network attack vector, low attack complexity, no privileges or user interaction required, and high impact on confidentiality and integrity.
Potential Impact
Successful exploitation allows an unauthenticated attacker to remove VLAN entries from the device configuration, potentially disrupting network segmentation and security controls. The impact includes high confidentiality and integrity loss, but no availability impact is indicated.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Until a patch is available, restrict network access to the device management interface and monitor for suspicious POST requests targeting /cgi-bin/cstecgi.cgi.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-06-08T00:00:00.000Z
- State
- PUBLISHED
Threat ID: 6a95d485acd9273b497d9e1c
Added to database: 08/31/2026, 19:22:45 UTC
Last enriched: 09/07/2026, 14:54:11 UTC
Last updated: 10/15/2026, 18:48:21 UTC
Views: 98
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