Buffer overflow in Totolink N600r
CVE-2026-79911
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.011 (64.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 64.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.011 · change: +0.005
Affected products
- Totolink N600r — versions 4.3.0cu.7647_B20210106
Weakness classification (CWE)
References
- vuldb.com/vuln/395061 (technical-description, vdb-entry)
- vuldb.com/vuln/395061/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-79911 (third-party-advisory)
- vuldb.com/submit/881258 (third-party-advisory)
- github.com/dxz0069/WAVLINK-WN530H4-Command-Injection-in-set_add_routing/blob/ma… (exploit)
- www.totolink.net/ (product)
Frequently asked questions
- What is CVE-2026-79911?
- CVE-2026-79911 is a critical-severity vulnerability in Totolink N600r, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 10.0/10. Published 2026-08-25.
- How severe is CVE-2026-79911?
- Critical severity. CVSS v3 base score is 10.0 out of 10.