Critical severity · published Aug 25, 2026
CVE-2026-79911
TOTOLINK N600R CGI cstecgi.cgi setSystemConfig stack-based overflow
10.0
CVSS
1.1%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 65% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
N6
N600R · TOTOLINK
4.3.0cu.7647_B20210106 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-79911
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-79911
github.com
https://github.com/dxz0069/WAVLINK-WN530H4-Command-Injection-in-set_add_routing/blob/main/TOTOLINK_N600R_cstecgi_strcpy_sprintf_Multi_Function_Stack_Overflow.md
vuldb.com
https://vuldb.com/cve/CVE-2026-79911
vuldb.com
https://vuldb.com/submit/881258
vuldb.com
https://vuldb.com/vuln/395061
vuldb.com
https://vuldb.com/vuln/395061/cti
www.totolink.net
https://www.totolink.net/
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