EUVD-2026-68532
GHSA-97gj-9c62-rm99
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessReach router web endpoint on LAN/WAN
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DeliverySend crafted POST to /cgi-bin/cstecgi.cgi
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ExploitInvoke getPairCfg without authentication
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ExecutionReceive pairing and mesh-slave config
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ImpactLeverage mesh secrets for further compromise
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 router's HTTP management endpoint /cgi-bin/cstecgi.cgi and the ability to send a POST invoking the getPairCfg function; no authentication, credentials, or user interaction are needed (PR:N/UI:N). The primary limiting factor is exposure of that endpoint: it is typically LAN-only unless WAN/remote administration is enabled, so real-world unauthenticated internet exploitation is gated on remote management being turned on or the attacker having local network access. Affected build is specifically TOTOLINK T6 firmware 4.1.5cu.748_B20211015. |
| Impact | The published CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N = 9.1) indicates trivial network-reachable, unauthenticated exploitation, which is consistent with the description of a single crafted POST. However, the I:H integrity impact appears inflated: the description describes only reading/obtaining configuration (an information-disclosure primitive), which supports C:H but not clearly I:H - my independent assessment is C:H/I:N/A:N (7.5). No EPSS score, KEV entry, or POC is provided, so despite the high CVSS this is not confirmed as actively exploited; realistic priority is elevated (unauthenticated, low-complexity disclosure on an internet-adjacent home device) but the disclosed data is configuration rather than direct code execution. Note the practical exposure limiter: consumer router admin interfaces are usually LAN-facing unless remote management is enabled, which meaningfully reduces the AV:N population. |
| Exploit ScenarioDerived | An attacker who can reach the router's web interface - an adjacent LAN client, a malicious device on the same network, or the internet if remote management is enabled - sends a single crafted POST to /cgi-bin/cstecgi.cgi invoking getPairCfg with no credentials. The response discloses mesh pairing and slave-node configuration, which the attacker uses to map or join the mesh and stage further attacks. No public POC is identified, but the low complexity (AC:L, PR:N, no user interaction) makes weaponization straightforward. |
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Alert meAnalysisAIv1 – Sep 01, 2026
Information disclosure in the TOTOLINK T6 mesh router (firmware 4.1.5cu.748_B20211015) lets remote unauthenticated attackers read pairing and mesh-slave configuration by sending a crafted POST request to the getPairCfg handler at /cgi-bin/cstecgi.cgi. The missing access-control check exposes mesh topology and pairing secrets that can facilitate deeper network compromise. No public exploit identified at time of analysis, and the CVE is not listed in CISA KEV; EPSS is not provided.
RemediationAI
No vendor-released patched version is identified in the provided data, so a specific fixed firmware cannot be cited. Check the TOTOLINK support/download page for the T6 (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) for an updated firmware image and apply it once released. As compensating controls, disable remote/WAN web administration so /cgi-bin/cstecgi.cgi is not reachable from the internet (trade-off: no off-LAN management), restrict LAN access to the admin interface via firewall/VLAN segmentation to trusted management hosts (trade-off: added network complexity), and rotate any mesh pairing credentials after patching since they may have been exposed. If the device is end-of-support, plan replacement, as unfixed CGI dispatcher flaws on this platform tend to recur.
Affected VersionsENISA
Affects your stack
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Technical ContextAI · show details
The T6 is a consumer/SOHO mesh Wi-Fi router whose web management backend is the ubiquitous TOTOLINK CGI dispatcher cstecgi.cgi, which routes JSON POST bodies to named internal functions (here, getPairCfg). The flaw is CWE-284 (Improper Access Control): the getPairCfg handler services requests without verifying an authenticated/authorized session, so mesh pairing and slave-node configuration are returned to any caller. This dispatcher and its per-function handlers have historically been a recurring source of TOTOLINK authentication and injection issues, as the single endpoint multiplexes many privileged operations. The CPE in the feed is a placeholder (cpe:2.3:a:n/a:n/a:*) and does not identify the product, so exact affected-product matching must come from the description and vendor page rather than the CPE dictionary.
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Unauthenticated, low-complexity remote read of pairing/mesh config gives C:H; description shows disclosure only, not modification, so I:N and A:N unlike the published I:H.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
3DescriptionCVE.org
Incorrect access control in the getPairCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain pairing and mesh-slave configuration via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
Executive ViewAI
The TOTOLINK T6 mesh router (firmware 4.1.5cu.748_B20211015) contains a critical information disclosure vulnerability allowing unauthenticated remote attackers to extract mesh topology and pairing secrets, directly enabling deeper network compromise and lateral movement. Organizations deploying this device face immediate risk of network architecture exposure and credential compromise without vendor remediation currently available.
Until vendor-released patch is available, restrict network-layer access to affected routers via firewall rules and VLAN segmentation; disable remote administration and WAN access to management interfaces; implement continuous monitoring for suspicious POST requests to the getPairCfg endpoint; enforce authentication on all network management tools; maintain air-gapped configuration backups; conduct periodic network traffic analysis for anomalous access patterns to mesh device administrative ports.
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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