CVE-2026-121599 Details
Description
A vulnerability was detected in TOTOLINK A950RG 4.1.2cu.5268_B20221104. Affected is the function setWiFiMultipleConfig/delWiFiMultipleConfig of the file /cgi-bin/cstecgi.cgi of the component Multi-SSID Configuration. The manipulation of the argument wepkey2/wepkey3 results in stack-based buffer overflow. It is possible to launch the attack remotely. The exploit is now public 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 Multi-SSID Configuration component, within the functions setWiFiMultipleConfig and delWiFiMultipleConfig, located in the file cgi-bin/cstecgi.cgi. The vulnerability is triggered by manipulating the wepkey2 or wepkey3 arguments, leading to a remote exploitation possibility.
To address this vulnerability, the affected functions should be modified to include proper length checks and use bounded string copy functions. Additionally, the firmware should be rebuilt with stack protection enabled and as a Position Independent Executable (PIE) with Address Space Layout Randomization (ASLR) activated.
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 7, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://gist.github.com/H3rmesk1t/44673654282c9b21bc8971bab7e4b8a3 | [email protected] | ExploitRemedyTechnical Analysis |
| https://vuldb.com/cve/CVE-2026-121599 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/1022561 | [email protected] | Issue TrackingPermission Required |
| https://vuldb.com/vuln/430441 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/vuln/430441/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 7, 2026 | CVE Modified | CISA-ADP |
| Nov 4, 2026 | New CVE Received | [email protected] |