Stack-based Buffer Overflow Vulnerability in TOTOLINK A950RG Multi-SSID Configuration
CVE-2026-121599

9.4CRITICAL

Key Information:

Vendor

Totolink
Status
A950rg
Vendor
CVE Published:
4 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-121599?

A vulnerability exists in the TOTOLINK A950RG router that affects its Multi-SSID Configuration functionality. Specifically, the setWiFiMultipleConfig and delWiFiMultipleConfig functions located in /cgi-bin/cstecgi.cgi are susceptible to a stack-based buffer overflow due to improper handling of the parameters wepkey2 and wepkey3. This flaw allows an attacker to execute a remote exploit, potentially compromising the system. Given that the exploit is now publicly available, it is imperative for users to apply necessary security measures.

Affected Version(s)

A950RG 4.1.2cu.5268_B20221104

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-121599 - Proof of Concept

References

https://vuldb.com/vuln/430441
vdb-entrytechnical-description
https://vuldb.com/vuln/430441/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-121599
third-party-advisory

CVSS V4

Score:
9.4
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

LiuYijun_JX.SGCC (VulDB User)
.