{"id":"CVE-2021-20041","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-20041","generatedAt":"2026-10-27T22:31:47.645Z","title":"An unauthenticated and remote adversary can consume all of the device's CPU due to crafted HTTP requests sent to SMA100 /fileshare/sonicfiles/sonicfiles resulting in a loop with unreachable exit condition.","description":"An unauthenticated and remote adversary can consume all of the device's CPU due to crafted HTTP requests sent to SMA100 /fileshare/sonicfiles/sonicfiles resulting in a loop with unreachable exit condition. 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":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-835"],"affected":["sonicwall/sma 200 firmware","sonicwall/sma 210 firmware","sonicwall/sma 410 firmware","sonicwall/sma 400 firmware","sonicwall/sma 500v firmware"],"epss":{"score":0.21197,"percentile":0.9757,"date":"2026-10-26","history":[{"date":"2026-10-02","score":0.21197,"percentile":0.97523}]},"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 21.2%, higher than 98% of all known CVEs. Patch or mitigate before the next change window."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-10-02T00:00:00.000Z","detail":{"to":0.21197,"from":0.066,"percentile":0.97523},"summary":"EPSS moved from 6.6% to 21.2% probability of exploitation in the next thirty days."}],"references":[{"url":"https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026","tags":["Vendor Advisory"],"source":"PSIRT@sonicwall.com"},{"url":"https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-20041","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."}