EUVD-2026-68642
GHSA-mx8q-m9hp-hgrx
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessReach router web interface on network
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DeliverySend crafted POST to /cgi-bin/cstecgi.cgi
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ExploitInvoke unauthenticated setWiFiWpsCfg
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ExecutionChange WPS availability state
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ImpactLeverage WPS for wireless access
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Access control enforcement
MITRE ATT&CK
1 technique across 1 tactic: Defense Evasion The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | The attacker must be able to reach the router's web management endpoint /cgi-bin/cstecgi.cgi over the network and send a crafted POST invoking the setWiFiWpsCfg action; no authentication, credentials, or user interaction are required (PR:N/UI:N per CVSS). The concrete limiting factor is network reachability of the management interface: by default this is LAN-side only, so real-world exposure depends on whether remote/WAN administration is enabled or the attacker already has a LAN foothold (e.g., rogue Wi-Fi client). Affected build is specifically TOTOLINK T6 firmware 4.1.5cu.748_B20211015. |
| Impact | The NVD/MITRE CVSS of 9.8 (AV:N/AC:L/PR:N/UI:N/C:H/I:H/A:H) appears inflated relative to the described behavior: the primary demonstrated impact is unauthorized modification of one wireless setting (an integrity effect), with no described path to direct data disclosure or denial of service, so full C:H/I:H/A:H is not well supported by the description alone. My independent read is closer to an integrity-focused high (I assess ~7.5). That said, the exploitation preconditions are genuinely low - network-reachable, no authentication, low complexity, no user interaction - so wherever the management interface is exposed (LAN, or WAN if remote management is on), the practical barrier is small and even a small municipal or mid-sized operator should treat an internet-exposed T6 as urgent. Countering the raw score: no EPSS value, no KEV listing, and no known POC are present, and TOTOLINK's footprint is limited, which argues this is a real-but-narrow issue rather than a mass-exploited emergency. Missing signals (EPSS, SSVC, confirmed patched version) should be resolved before final prioritization. |
| Exploit ScenarioDerived | An attacker on the same network (or the internet, if remote management is enabled) sends a single crafted POST to /cgi-bin/cstecgi.cgi invoking setWiFiWpsCfg with no credentials, flipping the router's WPS state. By enabling WPS the attacker sets up a follow-on WPS PIN brute-force or pairing attack to gain wireless access. No public POC is currently identified, but the low-complexity, unauthenticated nature makes a working request trivial to construct. |
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Alert meAnalysisAIv1 – Sep 01, 2026
Unauthenticated configuration tampering in the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets remote attackers toggle WPS availability by sending a crafted POST request to the setWiFiWpsCfg handler at /cgi-bin/cstecgi.cgi. The setter enforces no access control (CWE-284), so any attacker who can reach the device's web interface can change a security-relevant wireless setting without credentials. No public exploit or active exploitation has been identified at time of analysis; the finding was reported via MITRE.
RemediationAI
No vendor-released patched firmware version is independently confirmed in the provided data; check the TOTOLINK download portal (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) for a build newer than 4.1.5cu.748_B20211015 and apply it once verified. Until a fix is confirmed, disable remote/WAN management so /cgi-bin/cstecgi.cgi is not reachable from the internet (trade-off: loses off-LAN administration), and restrict access to the router's web UI to trusted management hosts/VLANs via firewall or ACL (trade-off: added network configuration). Because the flaw manipulates WPS, explicitly disable WPS on the device and monitor for it being re-enabled, and place the router's management plane behind a segmented network. Vendor coordination context is tracked at the referenced GitHub CVE-Vendor-Coordination README links.
Affected VersionsENISA
Affects your stack
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Technical ContextAI · show details
The affected component is the CGI-based management interface common to TOTOLINK SOHO routers, where the single endpoint /cgi-bin/cstecgi.cgi dispatches JSON/form actions to internal handler functions by name. The vulnerable handler, setWiFiWpsCfg, controls Wi-Fi Protected Setup (WPS) - the push-button/PIN pairing mechanism. The root cause is CWE-284 (Improper Access Control): the handler is invocable without authentication, so a caller can set the WPS configuration state directly. WPS itself has a long history of weaknesses (e.g., PIN brute-forcing), so an endpoint that can silently (re)enable it is security-relevant beyond the immediate config change. The supplied CPE (cpe:2.3:a:n/a:n/a:*) is a placeholder and does not correctly identify the product or vendor.
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated network setter with no user interaction (AV:N/AC:L/PR:N/UI:N), but described impact is unauthorized modification of a config setting, so I:H with C:N/A:N rather than full triple-high.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
3DescriptionCVE.org
Incorrect access control in the setWiFiWpsCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to change WPS availability via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
Executive ViewAI
The TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) contains a critical unauthenticated vulnerability allowing remote attackers to disable WPS security features, compromising wireless configuration integrity without requiring credentials. Any attacker with network access to the device can manipulate security-relevant settings, creating an entry point for broader network compromise. Organizations deploying this router model must treat this as a perimeter security incident requiring immediate inventory and isolation.
No vendor-released patch identified at time of analysis. Interim mitigations: (1) Manually disable WPS via router configuration if firmware permits; (2) Restrict network access to the router's administrative interface via firewall rules or network segmentation; (3) Monitor router logs and network traffic for POST requests to the vulnerable /cgi-bin/cstecgi.cgi endpoint; (4) Deploy network IPS rules to detect and block malformed POST requests to the setWiFiWpsCfg handler; (5) Establish a weekly firmware update check schedule and maintain contact with TOTOLINK support for patch status.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
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