{"id":"CVE-2021-20039","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-20039","generatedAt":"2026-10-27T23:37:00.489Z","title":"Improper neutralization of special elements in the SMA100 management interface '/cgi-bin/viewcert' POST http method allows a remote authenticated attacker to inject arbitrary commands as a 'nobody' user.","description":"Improper neutralization of special elements in the SMA100 management interface '/cgi-bin/viewcert' POST http method allows a remote authenticated attacker to inject arbitrary commands as a 'nobody' user. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances.","published":"2021-12-08T10:15:08.000Z","lastModified":"2026-06-17T03:33:12.000Z","status":"Modified","sourceIdentifier":"PSIRT@sonicwall.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-78"],"affected":["sonicwall/sma 200 firmware","sonicwall/sma 210 firmware","sonicwall/sma 410 firmware","sonicwall/sma 400 firmware","sonicwall/sma 500v firmware"],"epss":{"score":0.78746,"percentile":0.99587,"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":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 78.7%, higher than 100% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://packetstormsecurity.com/files/165563/SonicWall-SMA-100-Series-Authenticated-Command-Injection.html","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"PSIRT@sonicwall.com"},{"url":"https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026","tags":["Vendor Advisory"],"source":"PSIRT@sonicwall.com"},{"url":"http://packetstormsecurity.com/files/165563/SonicWall-SMA-100-Series-Authenticated-Command-Injection.html","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://attackerkb.com/topics/9szJhq46lw/cve-2021-20039/rapid7-analysis","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-20039","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."}