| Title | Totolink A8000RU 7.1cu.643_b20200521 Command Injection |
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| Description | A pre‑authentication OS command injection vulnerability exists in the `setIpQosRules` 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 `comment`, 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_347/README.md |
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| User | LtzHust (UID 95660) |
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| Submission | 04/26/2026 12:43 (3 months ago) |
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| Moderation | 05/24/2026 11:15 (28 days later) |
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| Status | Accepted |
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| VulDB entry | 365456 [Totolink A8000RU 7.1cu.643_b20200521 Web Management Interface /cgi-bin/cstecgi.cgi setIpQosRules Comment os command injection] |
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| Points | 20 |
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