CVE-2026-51677: n/a
Description
Incorrect access control in the setUPnPCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to change UPnP service state 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 setUPnPCfg function of TOTOLINK T6 firmware 4.1.5cu.748_B20211015. An unauthenticated attacker can exploit this flaw by sending a specially crafted POST request to the /cgi-bin/cstecgi.cgi endpoint, enabling them to modify the UPnP service state. The CVSS v3.1 score is 9.1, indicating critical severity with network attack vector, no privileges required, no user interaction, and high impact on confidentiality and integrity. No official patch or remediation information is currently available.
Potential Impact
Successful exploitation allows unauthenticated attackers to change the UPnP service state, which can lead to unauthorized control over device functions, resulting in a high impact on confidentiality and integrity of the affected device. Availability is not impacted. This could facilitate further attacks or unauthorized network access depending on the UPnP configuration.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict network access to the affected device, especially to the /cgi-bin/cstecgi.cgi endpoint, and disable UPnP if possible to reduce exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-06-08T00:00:00.000Z
- State
- PUBLISHED
Threat ID: 6a958ab9acd9273b492f08bf
Added to database: 08/31/2026, 14:07:53 UTC
Last enriched: 09/07/2026, 15:05:20 UTC
Last updated: 10/14/2026, 06:48:18 UTC
Views: 76
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