EUVD-2026-68650
GHSA-9vmv-42p8-w38f
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessReach router HTTP interface
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DeliverySend crafted POST to cstecgi.cgi
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ExploitInvoke setWiFiAdvancedCfg without auth
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ExecutionAlter advanced Wi-Fi config
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ImpactDegrade wireless service
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 | Exploitation requires network reachability to the TOTOLINK T6's HTTP management interface and the ability to send a crafted POST request to the /cgi-bin/cstecgi.cgi endpoint targeting the setWiFiAdvancedCfg function; per CVSS PR:N/UI:N no authentication or user interaction is needed against the affected firmware (4.1.5cu.748_B20211015). The key limiting factor is exposure of the web admin interface: by default the management UI is typically LAN-only, so remote exploitation depends on WAN-side admin access being enabled or the attacker already being on the local/guest network. Impact is bounded to wireless configuration/behavior degradation on that specific device and firmware rather than full device compromise. |
| Impact | The signals conflict and should be weighed carefully. The supplied CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N = 9.1) rates confidentiality and integrity as High, but the description only claims attackers can 'degrade wireless behavior,' which reads as an availability/integrity effect on Wi-Fi service rather than data disclosure - the C:H/I:H/A:N impact set appears inconsistent with the stated outcome and likely overstates severity. EPSS is very low (0.18%, 7th percentile), there is no CISA KEV listing, and no public PoC is identified, so despite the 9.1 headline this is not currently an actively-exploited, mass-scanned threat. That said, the exploitation barrier is genuinely low (network-reachable, no authentication, low complexity), so any operator exposing a T6 management interface to untrusted networks should treat it as a real hygiene priority rather than a theoretical one. In practice, exposure hinges on whether the web UI is reachable beyond the LAN; internet-exposed units are the meaningful risk population. |
| Exploit ScenarioDerived | An attacker who can reach the router's HTTP management interface - for instance an internet-exposed T6 or a malicious device on the same LAN/guest network - sends a single crafted POST request to /cgi-bin/cstecgi.cgi invoking setWiFiAdvancedCfg with no credentials, changing advanced wireless parameters and degrading or disrupting Wi-Fi service. No public proof-of-concept is identified, but the low complexity and lack of authentication make a working request straightforward to construct. |
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Alert meAnalysisAIv1 – Sep 01, 2026
Unauthenticated wireless-configuration tampering in the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets remote attackers reach the setWiFiAdvancedCfg handler through the /cgi-bin/cstecgi.cgi endpoint without credentials and alter advanced Wi-Fi settings to degrade wireless service. The flaw is an improper access-control (CWE-284) issue on a CGI function that should require authentication. No public exploit has been identified at time of analysis, and EPSS is low (0.18%, 7th percentile), indicating little observed exploitation interest so far.
RemediationAI
No vendor-released patched firmware version is independently confirmed in the available data; check the TOTOLINK firmware/download portal (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) for an updated T6 build superseding 4.1.5cu.748_B20211015 and apply it once published. Until a fixed firmware is confirmed, the primary compensating control is to ensure the router's web management interface (and /cgi-bin/cstecgi.cgi) is not reachable from the WAN/internet - disable remote/WAN administration in the device settings, which has no functional downside for typical home use. Additionally restrict management access to a trusted management VLAN or specific admin hosts on the LAN and block inbound access to the HTTP admin port at any upstream firewall; the trade-off is that legitimate remote administration must then be done over VPN. Given the device class, also consider replacing end-of-support hardware if the vendor does not ship a fix.
Affected VersionsENISA
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Technical ContextAI · show details
TOTOLINK consumer/SOHO routers expose their web management interface through a single CGI dispatcher, /cgi-bin/cstecgi.cgi, which routes JSON/POST requests to named handler functions - here setWiFiAdvancedCfg, responsible for advanced wireless parameters. The root cause is CWE-284 Improper Access Control: the dispatcher invokes the configuration setter without enforcing an authenticated/authorized session, so any client that can reach the HTTP interface can call the privileged function. This cstecgi.cgi handler pattern is a recurring weak point across TOTOLINK firmware, where individual function endpoints frequently lack per-request authorization checks. The CPE in the feed (cpe:2.3:a:n/a:n/a:*) is a placeholder and does not usefully identify the product; the affected item is the TOTOLINK T6 device firmware named in the description.
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Unauthenticated network config change to a single function that only degrades wireless behavior implies limited integrity and availability impact and no confidentiality disclosure, so C:N/I:L/A:L rather than the feed's C:H/I:H.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
3DescriptionCVE.org
Incorrect access control in the setWiFiAdvancedCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to degrade wireless behavior 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 access-control vulnerability (CVSS 9.1) allowing remote attackers to tamper with wireless settings and degrade network service availability. Any internet-connected attacker can disrupt Wi-Fi without authentication; no public exploit identified at time of analysis, but the CRITICAL severity and zero-patch status pose immediate organizational risk. This vulnerability directly threatens business operations by enabling denial-of-service attacks on network infrastructure.
No vendor-released patch identified at time of analysis. Implement firewall rules blocking external access to affected TOTOLINK T6 router management interfaces; restrict access to /cgi-bin/cstecgi.cgi endpoint via WAF, network segmentation, or access-control lists; isolate affected devices to internal-only networks; monitor vendor advisories for firmware updates; evaluate replacement with alternative router models with security patches applied.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
VulDB
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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