{"cve":"CVE-2021-27708","nvd":{"published":"2021-04-14T16:15:14.127","modified":"2026-06-17T03:45:22.290","status":"Modified","description":"Command Injection in TOTOLINK X5000R router with firmware v9.1.0u.6118_B20201102, and TOTOLINK A720R router with firmware v4.1.5cu.470_B20200911 allows remote attackers to execute arbitrary OS commands by sending a modified HTTP request. This occurs because the function executes glibc's system function with untrusted input. In the function, \"command\" parameter is directly passed to the attacker, allowing them to control the \"command\" field to attack the OS.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-78"],"references":["https://hackmd.io/7FtB06f-SJ-SCfkMYcXYxA","https://hackmd.io/mDgIBvoxSPCZrZiZjfQGhw","https://hackmd.io/7FtB06f-SJ-SCfkMYcXYxA","https://hackmd.io/mDgIBvoxSPCZrZiZjfQGhw"],"products":["totolink:a720r_firmware","totolink:x5000r_firmware"],"source":"nvd","synced_at":"2026-10-19T21:17:01.373894544+00:00"},"epss":{"cve":"CVE-2021-27708","score":0.0761,"percentile":0.94553,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}