| Title | Totolink A8000RU 7.1cu.643_b20200521 Command Injection |
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| Description | A pre‑authentication OS command injection vulnerability exists in the `setL2tpServerCfg` functionality exposed via the web management interface (`/cgi-bin/cstecgi.cgi`) of the TOTOLINK A8000RU 7.1cu.643_b20200521 router.
The CGI handler retrieves user‑controlled input from the HTTP parameter `enable`, embeds it directly into a shell command string using `sprintf`, and executes it via `CsteSystem()` without any sanitization or escaping. As a result, a remote attacker with network access to the web interface can inject arbitrary shell commands and execute them with root privileges on the device, without authentication. |
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| Source | ⚠️ https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_357/README.md |
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| User | LtzHuster2 (UID 96397) |
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| Submission | 04/27/2026 08:03 (3 months ago) |
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| Moderation | 05/24/2026 09:07 (27 days later) |
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| Status | Accepted |
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| VulDB entry | 365417 [Totolink A8000RU 7.1cu.643_b20200521 Web Management Interface /cgi-bin/cstecgi.cgi setL2tpServerCfg enable os command injection] |
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| Points | 20 |
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