{"id":"CVE-2021-33765","title":"Windows Installer Spoofing Vulnerability","summary":"Windows Installer Spoofing Vulnerability","severity":"medium","cvss":6.2,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","vendor":"microsoft","product":"windows_10","affected":["windows_10","windows_10 = 20h2","windows_10 = 21h1","windows_10 = 1607","windows_10 = 1809","windows_10 = 1909","windows_10 = 2004","windows_7","windows_8.1","windows_rt_8.1","windows_server_2008","windows_server_2012","windows_server_2016","windows_server_2016 = 20h2","windows_server_2016 = 2004","windows_server_2019"],"published":"2021-07-14","updated":"2026-08-10","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-33765","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-33765","label":"secure@microsoft.com"},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33765","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00721,"epssPercentile":0.52072,"ingestedAt":"2026-08-10T16:41:15.408Z","slug":"CVE-2021-33765","body":"## Overview\n\nWindows Installer Spoofing Vulnerability\n\n## Affected\n\n- `windows_10`\n- `windows_10 = 20h2`\n- `windows_10 = 21h1`\n- `windows_10 = 1607`\n- `windows_10 = 1809`\n- `windows_10 = 1909`\n- `windows_10 = 2004`\n- `windows_7`\n- `windows_8.1`\n- `windows_rt_8.1`\n- `windows_server_2008`\n- `windows_server_2012`\n- `windows_server_2016`\n- `windows_server_2016 = 20h2`\n- `windows_server_2016 = 2004`\n- `windows_server_2019`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":34,"depthScoreParts":{"impact":34.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}