{"id":"CVE-2020-0645","aliases":["EUVD-2020-2139","GHSA-j5hm-cjrm-f26f"],"status":"published","title":"A tampering vulnerability exists when Microsoft IIS Server improperly handles malformed request...","description":"A tampering vulnerability exists when Microsoft IIS Server improperly handles malformed request headers, aka 'Microsoft IIS Server Tampering Vulnerability'.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.03904,"percentile":0.90363,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20"],"published":"2020-03-12T15:48:03Z","modified":"2026-06-17T02:46:15Z","products":[{"vendor":"microsoft","product":"windows"},{"vendor":"microsoft","product":"windows 10 version 1903 for 32-bit systems"},{"vendor":"microsoft","product":"windows 10 version 1903 for arm64-based systems"},{"vendor":"microsoft","product":"windows 10 version 1903 for x64-based systems"},{"vendor":"microsoft","product":"windows 10 version 1909 for 32-bit systems"},{"vendor":"microsoft","product":"windows 10 version 1909 for arm64-based systems"},{"vendor":"microsoft","product":"windows 10 version 1909 for x64-based systems"},{"vendor":"microsoft","product":"windows server"},{"vendor":"microsoft","product":"windows server, version 1903 (server core installation)"},{"vendor":"microsoft","product":"windows server, version 1909 (server core installation)"},{"vendor":"microsoft","product":"windows_10"},{"vendor":"microsoft","product":"windows_7"},{"vendor":"microsoft","product":"windows_8.1"},{"vendor":"microsoft","product":"windows_rt_8.1"},{"vendor":"microsoft","product":"windows_server_2008"},{"vendor":"microsoft","product":"windows_server_2012"},{"vendor":"microsoft","product":"windows_server_2016"},{"vendor":"microsoft","product":"windows_server_2019"}],"references":[{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0645","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-0645"},{"url":"https://github.com/advisories/GHSA-j5hm-cjrm-f26f"}],"sources":{"cve":[{"id":"CVE-2020-0645","description":"A tampering vulnerability exists when Microsoft IIS Server improperly handles malformed request headers, aka 'Microsoft IIS Server Tampering Vulnerability'.","status":"published","published":"2020-03-12T15:48:03Z","modified":"2024-08-04T06:11:04.567Z","updated_at":"2026-11-02T14:35:59.763887Z"}],"euvd":[{"id":"EUVD-2020-2139","description":"A tampering vulnerability exists when Microsoft IIS Server improperly handles malformed request headers, aka 'Microsoft IIS Server Tampering Vulnerability'.","status":"published","published":"2020-03-12T15:48:03Z","modified":"2024-08-04T06:11:04Z","updated_at":"2026-11-03T03:08:19.102243Z"}],"ghsa":[{"id":"GHSA-j5hm-cjrm-f26f","title":"A tampering vulnerability exists when Microsoft IIS Server improperly handles malformed request...","description":"A tampering vulnerability exists when Microsoft IIS Server improperly handles malformed request headers, aka 'Microsoft IIS Server Tampering Vulnerability'.","status":"published","published":"2022-05-24T17:10:53Z","modified":"2023-01-29T05:01:49Z","cwes":["CWE-20"],"updated_at":"2026-11-02T14:44:55.382004Z"}],"nvd":[{"id":"CVE-2020-0645","description":"A tampering vulnerability exists when Microsoft IIS Server improperly handles malformed request headers, aka 'Microsoft IIS Server Tampering Vulnerability'.","status":"published","published":"2020-03-12T16:15:13.487Z","modified":"2026-06-17T02:46:15.07Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:05:55.32877Z"}]}}