{"id":"CVE-2021-26858","details":"Microsoft Exchange Server Remote Code Execution Vulnerability","modified":"2026-05-04T08:34:58.883042Z","published":"2021-03-03T00:15:12.227Z","withdrawn":"2026-05-04T08:34:58.883042Z","references":[{"type":"WEB","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26858"},{"type":"FIX","url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26858"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"last_affected":"2010-sp3"}]},{"events":[{"introduced":"0"},{"last_affected":"2013-cumulative_update_22"}]},{"events":[{"introduced":"0"},{"last_affected":"2013-cumulative_update_23"}]},{"events":[{"introduced":"0"},{"last_affected":"2013-sp1"}]},{"events":[{"introduced":"0"},{"last_affected":"2016-cumulative_update_10"}]},{"events":[{"introduced":"0"},{"last_affected":"2016-cumulative_update_11"}]},{"events":[{"introduced":"0"},{"last_affected":"2016-cumulative_update_12"}]},{"events":[{"introduced":"0"},{"last_affected":"2016-cumulative_update_13"}]},{"events":[{"introduced":"0"},{"last_affected":"2016-cumulative_update_14"}]},{"events":[{"introduced":"0"},{"last_affected":"2016-cumulative_update_15"}]},{"events":[{"introduced":"0"},{"last_affected":"2016-cumulative_update_16"}]},{"events":[{"introduced":"0"},{"last_affected":"2016-cumulative_update_17"}]},{"events":[{"introduced":"0"},{"last_affected":"2016-cumulative_update_18"}]},{"events":[{"introduced":"0"},{"last_affected":"2016-cumulative_update_19"}]},{"events":[{"introduced":"0"},{"last_affected":"2016-cumulative_update_8"}]},{"events":[{"introduced":"0"},{"last_affected":"2016-cumulative_update_9"}]},{"events":[{"introduced":"0"},{"last_affected":"2019-NA"}]},{"events":[{"introduced":"0"},{"last_affected":"2019-cumulative_update_1"}]},{"events":[{"introduced":"0"},{"last_affected":"2019-cumulative_update_2"}]},{"events":[{"introduced":"0"},{"last_affected":"2019-cumulative_update_3"}]},{"events":[{"introduced":"0"},{"last_affected":"2019-cumulative_update_4"}]},{"events":[{"introduced":"0"},{"last_affected":"2019-cumulative_update_5"}]},{"events":[{"introduced":"0"},{"last_affected":"2019-cumulative_update_6"}]},{"events":[{"introduced":"0"},{"last_affected":"2019-cumulative_update_7"}]},{"events":[{"introduced":"0"},{"last_affected":"2019-cumulative_update_8"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-26858.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}]}