Vulnerability · Published Nov 4, 2026 · Assigned by VulDB

CVE-2026-121597TOTOLINK A950RG Easy Setup Wizard cstecgi.cgi setAppEasyWizardConfig 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 0.6% (higher than 49% of all known vulnerabilities).

Severity (CVSS 3.1)9.9Critical

Exploit odds (30 days)0.6%top 51.0% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

A weakness has been identified in TOTOLINK A950RG 4.1.2cu.5268_B20221104. This affects the function setAppEasyWizardConfig of the file /cgi-bin/cstecgi.cgi of the component Easy Setup Wizard Handler. Executing a manipulation of the argument functionType can lead to stack-based buffer overflow. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks.

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-430439 | TOTOLINK A950RG Easy Setup Wizard cstecgi.cgi setAppEasyWizardConfig stack-based overflow vdb-entry, technical-description
VDB-430439 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
CVE-2026-121597 | CVE Analysis and Report third-party-advisory
Submit #1022558 | TOTOLINK A950RG V4.1.2cu.5268_B20221104 Stack Buffer Overflow third-party-advisory
https://gist.github.com/H3rmesk1t/49d6ccded59379651568e0bdc6b5624c exploit
https://www.totolink.net/ broken-link, product