{"id":"CVE-2020-5756","url":"https://www.cyber-defence.io/tools/cve/CVE-2020-5756","generatedAt":"2026-10-27T20:22:21.135Z","title":"Grandstream GWN7000 firmware version 1.0.9.4 and below allows authenticated remote users to modify the system's crontab via undocumented API.","description":"Grandstream GWN7000 firmware version 1.0.9.4 and below allows authenticated remote users to modify the system's crontab via undocumented API. An attacker can use this functionality to execute arbitrary OS commands on the router.","published":"2020-07-17T21:15:14.000Z","lastModified":"2026-06-17T03:22:11.000Z","status":"Modified","sourceIdentifier":"vulnreport@tenable.com","cvss":{"version":"3.1","score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-489","CWE-78"],"affected":["grandstream/gwn7000 firmware"],"epss":{"score":0.02473,"percentile":0.84414,"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 (2.47%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://www.tenable.com/security/research/tra-2020-41","tags":["Not Applicable"],"source":"vulnreport@tenable.com"},{"url":"https://www.tenable.com/cve/CVE-2020-5756","tags":["Exploit","Third Party Advisory"],"source":"nvd@nist.gov"},{"url":"https://www.tenable.com/security/research/tra-2020-41","tags":["Not Applicable"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-5756","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."}