Stack-based Buffer Overflow Vulnerability in TOTOLINK A950RG Wireless Configuration
CVE-2026-121598

9.4CRITICAL

Key Information:

Vendor

Totolink
Status
A950rg
Vendor
CVE Published:
4 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-121598?

A vulnerability exists in the TOTOLINK A950RG router, specifically within the Basic Wireless Configuration Handler's strcpy function in the cstecgi.cgi file. This flaw allows an attacker to exploit the wepkey argument, resulting in a stack-based buffer overflow. This vulnerability can be initiated from a remote location, making it crucial for users to assess their network security and apply any necessary updates or patches to mitigate potential risks.

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-2026-121598 - Proof of Concept

References

https://vuldb.com/vuln/430440
vdb-entrytechnical-description
https://vuldb.com/vuln/430440/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-121598
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)
.