CVE-2026-121598 Details
Description
A security vulnerability has been detected in TOTOLINK A950RG 4.1.2cu.5268_B20221104. This impacts the function strcpy of the file /cgi-bin/cstecgi.cgi of the component Basic Wireless Configuration Handler. The manipulation of the argument wepkey leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed publicly and may be used.
A stack-based buffer overflow vulnerability has been identified in the TOTOLINK A950RG router, specifically in the firmware version 4.1.2cu.5268_B20221104. The issue arises in the Basic Wireless Configuration Handler, within the 'strcpy' function of the '/cgi-bin/cstecgi.cgi' file. The vulnerability is triggered by manipulating the 'wepkey' argument, allowing for remote exploitation. The flaw has been publicly disclosed and could be actively exploited.
To address this vulnerability, the 'wepkey' parameter should be validated for length and character set before being processed. The 'strcpy' function should be replaced with 'snprintf' to prevent overflow, and the 'string_to_hex' function should be given the correct buffer capacity. Additionally, the firmware should be rebuilt with stack protection and as a Position Independent Executable.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Nov 4, 2026CISA-ADP
Assessed Nov 4, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://gist.github.com/H3rmesk1t/e283a4f3224cbd0a57d4392de60bd2c6 | [email protected] | ExploitRemedyTechnical Description |
| https://vuldb.com/cve/CVE-2026-121598 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/1022559 | [email protected] | Issue TrackingPermission Required |
| https://vuldb.com/vuln/430440 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/vuln/430440/cti | [email protected] | Content Wall |
| https://www.totolink.net/ | [email protected] | Vendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-119 | Improper Restriction of Operations within the Bounds of a Memory Buffer | [email protected] |
| CWE-121 | Stack-based Buffer Overflow | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| TOTOLINK A950RG | V4.1.2cu.5268_B20221104 |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 4, 2026 | CVE Modified | CISA-ADP |
| Nov 4, 2026 | New CVE Received | [email protected] |