{"id":"CVE-2021-34522","title":"Microsoft Defender Remote Code Execution Vulnerability","summary":"Microsoft Defender Remote Code Execution Vulnerability","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","vendor":"microsoft","product":"malware_protection_engine","affected":["malware_protection_engine < 1.1.18242.0"],"patched":["malware_protection_engine 1.1.18242.0"],"published":"2021-07-14","updated":"2026-08-10","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-34522","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34522","label":"secure@microsoft.com"},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34522","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.02699,"epssPercentile":0.85205,"ingestedAt":"2026-08-10T16:41:17.479Z","slug":"CVE-2021-34522","body":"## Overview\n\nMicrosoft Defender Remote Code Execution Vulnerability\n\n## Affected\n\n- `malware_protection_engine < 1.1.18242.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `malware_protection_engine 1.1.18242.0`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0.5,"exploitation":0,"ransomware":0},"changes":[]}