Vulnerability · Published Nov 4, 2026 · Assigned by VulDB

CVE-2026-121598TOTOLINK A950RG Basic Wireless Configuration cstecgi.cgi strcpy stack-based overflow

Critical 9.9

In plain English

A critical-severity stack buffer overflow in A950RG from TOTOLINK. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities).

Severity (CVSS 3.1)9.9Critical

Exploit odds (30 days)0.5%top 59.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
TOTOLINK	A950RG	4.1.2cu.5268_B20221104

Weakness: CWE-121, CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R

References

VDB-430440 | TOTOLINK A950RG Basic Wireless Configuration cstecgi.cgi strcpy stack-based overflow vdb-entry, technical-description
VDB-430440 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
CVE-2026-121598 | CVE Analysis and Report third-party-advisory
Submit #1022559 | TOTOLINK A950RG V4.1.2cu.5268_B20221104 Stack Buffer Overflow third-party-advisory
https://gist.github.com/H3rmesk1t/e283a4f3224cbd0a57d4392de60bd2c6 exploit
https://www.totolink.net/ product