{"id":"CVE-2021-20031","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-20031","generatedAt":"2026-11-05T01:03:23.650Z","title":"A Host Header Redirection vulnerability in SonicOS potentially allows a remote attacker to redirect firewall management users to arbitrary web domains.","description":"A Host Header Redirection vulnerability in SonicOS potentially allows a remote attacker to redirect firewall management users to arbitrary web domains.","published":"2021-10-12T23:15:08.000Z","lastModified":"2026-06-17T03:33:11.000Z","status":"Modified","sourceIdentifier":"PSIRT@sonicwall.com","cvss":{"version":"3.1","score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"cwe":["CWE-601"],"affected":["sonicwall/sonicos"],"epss":{"score":0.13041,"percentile":0.96348,"date":"2026-11-03","history":[]},"kev":{"listed":false},"exploits":{"count":1,"verified":false,"firstPublished":"2021-10-13","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":50414,"kind":"exploit","title":"Sonicwall SonicOS 7.0 - Host Header Injection","url":"https://www.exploit-db.com/exploits/50414","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/hardware/webapps/50414.txt","file":"exploits/hardware/webapps/50414.txt","published":"2021-10-13","added":"2021-10-13","updated":"2021-10-13","author":"Ramikan","type":"webapps","platform":"hardware","port":null,"verified":false,"codes":["CVE-2021-20031"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":null}]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 13.0%, higher than 96% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://packetstormsecurity.com/files/164502/Sonicwall-SonicOS-7.0-Host-Header-Injection.html","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"PSIRT@sonicwall.com"},{"url":"https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0019","tags":["Vendor Advisory"],"source":"PSIRT@sonicwall.com"},{"url":"http://packetstormsecurity.com/files/164502/Sonicwall-SonicOS-7.0-Host-Header-Injection.html","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0019","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-20031","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."}