EUVD-2026-66196
GHSA-wgfc-85p2-7526
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable low-complexity stack overflow yielding code execution gives C/I/A:H; PR:N follows the reported vector but is uncertain since cstecgi.cgi often requires a session.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
5DescriptionCVE.org
A security vulnerability has been detected in TOTOLINK N600R 4.3.0cu.7647_B20210106. The affected element is the function setSystemConfig of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument Hostname leads to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed publicly and may be used.
AnalysisAI
Stack-based buffer overflow in the TOTOLINK N600R router (firmware 4.3.0cu.7647_B20210106) lets remote attackers corrupt memory by supplying an oversized Hostname argument to the setSystemConfig function in /cgi-bin/cstecgi.cgi, potentially enabling arbitrary code execution on the device. Publicly available exploit code exists (disclosed via VulDB and a GitHub write-up), though the flaw is not listed in CISA KEV. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the router's HTTP management service and the ability to call the setSystemConfig action of /cgi-bin/cstecgi.cgi with an attacker-controlled, oversized Hostname argument on firmware 4.3.0cu.7647_B20210106. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals mostly agree this is a genuine, easily reachable flaw: the CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N) indicates network-reachable, low-complexity exploitation with no authentication or user interaction, and the E:P (Proof-of-Concept) flag plus a published GitHub PoC confirm working exploit code. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with network access to the router's management interface sends a crafted HTTP request to /cgi-bin/cstecgi.cgi invoking setSystemConfig with an overlong Hostname value, overflowing a stack buffer and hijacking control flow to run attacker-supplied code on the device. Because a public PoC and technical write-up already exist and CVSS complexity is low, a remote attacker could reliably crash the router or gain code execution; success yields full control of the gateway and the traffic passing through it. |
| Remediation | No vendor-released patch identified at time of analysis; TOTOLINK has published no fixed firmware version in the provided data, so upgrade guidance cannot cite an exact build - monitor https://www.totolink.net/ for an updated N600R firmware release. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Conduct inventory of all TOTOLINK N600R routers in production and confirm firmware version status; segregate affected devices from critical network segments if feasible. …
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Stack Overflow
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External POC / Exploit Code
Leaving vuln.today