{"id":"CVE-2021-34470","title":"Microsoft Exchange Server Elevation of Privilege Vulnerability","summary":"Microsoft Exchange Server Elevation of Privilege Vulnerability","severity":"high","cvss":8,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"microsoft","product":"exchange_server","affected":["exchange_server = 2013","exchange_server = 2016","exchange_server = 2019"],"published":"2021-07-14","updated":"2026-08-10","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-34470","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34470","label":"secure@microsoft.com"},{"url":"http://packetstormsecurity.com/files/163706/Microsoft-Exchange-AD-Schema-Misconfiguration-Privilege-Escalation.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34470","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd","exploit-available"],"epss":0.04379,"epssPercentile":0.90918,"ingestedAt":"2026-08-10T16:41:16.152Z","exploits":{"github":1,"githubRepos":["https://github.com/technion/CVE-2021-34470scanner"],"checkedAt":"2026-09-25T08:20:38.587Z"},"exploitAvailable":true,"slug":"CVE-2021-34470","body":"## Overview\n\nMicrosoft Exchange Server Elevation of Privilege Vulnerability\n\n## Affected\n\n- `exchange_server = 2013`\n- `exchange_server = 2016`\n- `exchange_server = 2019`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":57,"depthScoreParts":{"impact":44,"likelihood":0.9,"exploitation":12,"ransomware":0},"changes":[{"seq":4523,"id":"CVE-2021-34470","ts":1788887187669,"field":"exploit_available","old":"false","new":"true"},{"seq":3406,"id":"CVE-2021-34470","ts":1788886305343,"field":"exploit_available","old":"true","new":"false"},{"seq":2261,"id":"CVE-2021-34470","ts":1788882974839,"field":"exploit_available","old":"false","new":"true"},{"seq":1290,"id":"CVE-2021-34470","ts":1788882386637,"field":"exploit_available","old":"true","new":"false"},{"seq":404,"id":"CVE-2021-34470","ts":1788881822394,"field":"exploit_available","old":"false","new":"true"}]}