CVE-2026-121597— TOTOLINK A950RG Easy Setup Wizard cstecgi.cgi setAppEasyWizardConfig stack-based overflow

Quick assessment

Affected

TOTOLINK A950RG

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 TOTOLINK A950RG 固件版本 4.1.2cu.5268_B20221104 中发现了一个安全弱点。该问题影响文件中“简易设置向导处理器”（Easy Setup Wizard Handler）组件的函数。攻击者通过恶意篡改参数，可引发基于栈的缓冲区溢出漏洞。该攻击可从远程发起。目前，相关利用代码已向公众公开，可能被用于实际攻击。

CVSS 9.9 · Critical Updated Nov 04, 2026

Possible ATT&CK Techniques 2 AI

T1068 · Exploitation for Privilege Escalation T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

TOTOLINK A950RG Easy Setup Wizard cstecgi.cgi setAppEasyWizardConfig stack-based overflow

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

栈缓冲区溢出

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
TOTOLINK	A950RG	4.1.2cu.5268_B20221104	`cpe:2.3:o:totolink:a950rg_firmware::::::::`

II. Public POCs for CVE-2026-121597

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-121597

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Other References for CVE-2026-121597 (5)

https://gist.github.com/H3rmesk1t/49d6ccded59379651568e0bdc6b5624c exploit
https://vuldb.com/cve/CVE-2026-121597 third-party-advisory
https://vuldb.com/vuln/430439/cti signature permissions-required
https://vuldb.com/submit/1022558 third-party-advisory
https://vuldb.com/vuln/430439 vdb-entry technical-description

https://www.cve.org/CVERecord?id=CVE-2026-121597

Same Patch Batch · TOTOLINK · 2026-11-04 · 4 CVEs total

CVE-2026-121600	9.9 CRITICAL	TOTOLINK A950RG MAC Filter cstecgi.cgi setMacFilterRules stack-based overflow
CVE-2026-121599	9.9 CRITICAL	TOTOLINK A950RG Multi-SSID Configuration cstecgi.cgi delWiFiMultipleConfig stack-based ove
CVE-2026-121598	9.9 CRITICAL	TOTOLINK A950RG Basic Wireless Configuration cstecgi.cgi strcpy stack-based overflow

IV. Related Vulnerabilities

Same product: A950RG

Same vendor: TOTOLINK

Same weakness: CWE-121