Vulnerability · Published Nov 4, 2026 · Assigned by VulDB

CVE-2026-121600TOTOLINK A950RG MAC Filter cstecgi.cgi setMacFilterRules stack-based overflow

Critical 9.9

In plain English

A critical-severity stack buffer overflow in A950RG from TOTOLINK. There are no confirmed reports of exploitation so far. 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 reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

A flaw has been found in TOTOLINK A950RG 4.1.2cu.5268_B20221104. Affected by this vulnerability is the function setMacFilterRules of the file /cgi-bin/cstecgi.cgi of the component MAC Filter Handler. This manipulation of the argument addEffect causes stack-based buffer overflow. The attack can be initiated remotely. The exploit has been published 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-430442 | TOTOLINK A950RG MAC Filter cstecgi.cgi setMacFilterRules stack-based overflow vdb-entry, technical-description
VDB-430442 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
CVE-2026-121600 | CVE Analysis and Report third-party-advisory
Submit #1022562 | TOTOLINK A950RG V4.1.2cu.5268_B20221104 Stack Buffer Overflow third-party-advisory
https://gist.github.com/H3rmesk1t/217c00b12e04fcde07c453a55579f808 exploit
https://www.totolink.net/ product