{"id":"CVE-2021-27708","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-27708","generatedAt":"2026-10-27T20:19:09.903Z","title":"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.","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.","published":"2021-04-14T16:15:14.000Z","lastModified":"2026-06-17T03:45:22.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-78"],"affected":["totolink/x5000r firmware","totolink/a720r firmware"],"epss":{"score":0.0761,"percentile":0.94512,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (7.61%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://hackmd.io/7FtB06f-SJ-SCfkMYcXYxA","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://hackmd.io/mDgIBvoxSPCZrZiZjfQGhw","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://hackmd.io/7FtB06f-SJ-SCfkMYcXYxA","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://hackmd.io/mDgIBvoxSPCZrZiZjfQGhw","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-27708","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}