{"id":"CVE-2021-45468","aliases":["EUVD-2021-32234","GHSA-332m-xp6m-r638"],"status":"published","title":"Imperva Web Application Firewall (WAF) before 2021-12-31 allows remote unauthenticated attackers...","description":"Imperva Web Application Firewall (WAF) before 2021-12-23 allows remote unauthenticated attackers to use \"Content-Encoding: gzip\" to evade WAF security controls and send malicious HTTP POST requests to web servers behind the WAF.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.04219,"percentile":0.91129,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-444"],"published":"2022-01-14T17:58:09Z","modified":"2026-06-17T04:13:25Z","exploits":[{"source":"pocgithub","id":"0xhaggis/Imperva_gzip_bypass","title":"0xhaggis/Imperva_gzip_bypass","date":"2021-12-12","url":"https://github.com/0xhaggis/Imperva_gzip_bypass"}],"products":[{"vendor":"imperva","product":"web_application_firewall"}],"references":[{"url":"https://bishopfox.com/blog/imperva-eliminates-critical-exposure","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-45468"},{"url":"https://github.com/advisories/GHSA-332m-xp6m-r638"}],"sources":{"cve":[{"id":"CVE-2021-45468","description":"Imperva Web Application Firewall (WAF) before 2021-12-23 allows remote unauthenticated attackers to use \"Content-Encoding: gzip\" to evade WAF security controls and send malicious HTTP POST requests to web servers behind the WAF.","status":"published","published":"2022-01-14T17:58:09Z","modified":"2024-08-04T04:39:21.099Z","updated_at":"2026-11-02T14:33:02.580561Z"}],"euvd":[{"id":"EUVD-2021-32234","description":"Imperva Web Application Firewall (WAF) before 2021-12-23 allows remote unauthenticated attackers to use \"Content-Encoding: gzip\" to evade WAF security controls and send malicious HTTP POST requests to web servers behind the WAF.","status":"published","published":"2022-01-14T17:58:09Z","modified":"2024-08-04T04:39:21Z","updated_at":"2026-11-03T03:08:27.448176Z"}],"ghsa":[{"id":"GHSA-332m-xp6m-r638","title":"Imperva Web Application Firewall (WAF) before 2021-12-31 allows remote unauthenticated attackers...","description":"Imperva Web Application Firewall (WAF) before 2021-12-31 allows remote unauthenticated attackers to use \"Content-Encoding: gzip\" to evade WAF security controls and send malicious HTTP POST requests to web servers behind the WAF.","status":"published","published":"2022-01-15T00:01:40Z","modified":"2023-02-03T05:04:45Z","cwes":["CWE-444"],"updated_at":"2026-11-02T14:53:37.258179Z"}],"nvd":[{"id":"CVE-2021-45468","description":"Imperva Web Application Firewall (WAF) before 2021-12-23 allows remote unauthenticated attackers to use \"Content-Encoding: gzip\" to evade WAF security controls and send malicious HTTP POST requests to web servers behind the WAF.","status":"published","published":"2022-01-14T18:15:10.203Z","modified":"2026-06-17T04:13:25.63Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T14:07:03.821385Z"}]}}