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

- Exploited (CISA KEV): no
- Published: 2026-11-04
- CVSS: 9.4 CRITICAL (v4.0)
- EPSS: no score
- CWE: CWE-121, CWE-119

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.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | No public claim | — | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | No public claim | — | — |
| Fastly | No public claim | — | — |
| Vercel | No public claim | — | — |
| F5 | No public claim | — | — |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

## Social

2 posts seen since 2026-11-04.

- x 2026-11-04: 🔴 TOTOLINK A950RG: TOTOLINK A950RG Easy Setup Wizard cstecgi.cgi setAppEasyWizardConfig stack-based overflow (CVE-2026-121597) No fix listed yet https://t.co/6PzDIhRsGT (https://x.com/agentprime_io/status/2117777794889286090)
- x 2026-11-04: 🆕 New CVE TOTOLINK A950RG: stack-based buffer overflow in easy setup wizard (CVE-2026-121597) A remote attacker can crash the device or take control of it by manipulating a single input parameter. No patch listed yet https://t.co/B27AXmDoPo (https://x.com/cvedotnow/status/2117777007475822661)

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2026-121597 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2026-121597