Buffer overflow in Totolink A950rg
CVE-2026-121598
A security vulnerability has been detected in TOTOLINK A950RG 4.1.2cu.5268_B20221104. This impacts the function strcpy of the file /cgi-bin/cstecgi.cgi of the component Basic Wireless Configuration Handler. The manipulation of the argument wepkey leads to stack-based buffer overflow. It is possible to initiate 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 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Totolink A950rg — versions 4.1.2cu.5268_B20221104
Weakness classification (CWE)
References
- vuldb.com/vuln/430440 (technical-description, vdb-entry)
- vuldb.com/vuln/430440/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-121598 (third-party-advisory)
- vuldb.com/submit/1022559 (third-party-advisory)
- gist.github.com/H3rmesk1t/e283a4f3224cbd0a57d4392de60bd2c6 (exploit)
- www.totolink.net/ (product)
Frequently asked questions
- What is CVE-2026-121598?
- CVE-2026-121598 is a critical-severity vulnerability in Totolink A950rg, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.9/10. Published 2026-11-04.
- How severe is CVE-2026-121598?
- Critical severity. CVSS v3 base score is 9.9 out of 10.