{"id":"CVE-2020-16949","aliases":["EUVD-2020-8907","GHSA-cvmr-qp3p-228w"],"status":"published","title":"Microsoft Outlook Denial of Service Vulnerability","description":"\u003cp\u003eA denial of service vulnerability exists in Microsoft Outlook software when the software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could cause a remote denial of service against a system.\u003c/p\u003e\n\u003cp\u003eExploitation of the vulnerability requires that a specially crafted email be sent to a vulnerable Outlook server.\u003c/p\u003e\n\u003cp\u003eThe security update addresses the vulnerability by correcting how Microsoft Outlook handles objects in memory.\u003c/p\u003e","severity":{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.02968,"percentile":0.8735,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-401"],"published":"2020-10-16T22:18:02Z","modified":"2026-06-17T02:58:20Z","products":[{"vendor":"microsoft","product":"365_apps"},{"vendor":"microsoft","product":"microsoft 365 apps for enterprise"},{"vendor":"microsoft","product":"microsoft office 2019"},{"vendor":"microsoft","product":"microsoft outlook 2010 service pack 2"},{"vendor":"microsoft","product":"microsoft outlook 2013 service pack 1"},{"vendor":"microsoft","product":"microsoft outlook 2016"},{"vendor":"microsoft","product":"office"},{"vendor":"microsoft","product":"outlook"},{"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-2020-16949","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-16949"},{"url":"https://github.com/advisories/GHSA-cvmr-qp3p-228w"}],"sources":{"cve":[{"id":"CVE-2020-16949","title":"Microsoft Outlook Denial of Service Vulnerability","description":"\u003cp\u003eA denial of service vulnerability exists in Microsoft Outlook software when the software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could cause a remote denial of service against a system.\u003c/p\u003e\n\u003cp\u003eExploitation of the vulnerability requires that a specially crafted email be sent to a vulnerable Outlook server.\u003c/p\u003e\n\u003cp\u003eThe security update addresses the vulnerability by correcting how Microsoft Outlook handles objects in memory.\u003c/p\u003e","status":"published","published":"2020-10-16T22:18:02Z","modified":"2024-08-04T13:45:34.666Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:35:59.116379Z"}],"euvd":[{"id":"EUVD-2020-8907","description":"\u003cp\u003eA denial of service vulnerability exists in Microsoft Outlook software when the software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could cause a remote denial of service against a system.\u003c/p\u003e\n\u003cp\u003eExploitation of the vulnerability requires that a specially crafted email be sent to a vulnerable Outlook server.\u003c/p\u003e\n\u003cp\u003eThe security update addresses the vulnerability by correcting how Microsoft Outlook handles objects in memory.\u003c/p\u003e","status":"published","published":"2020-10-16T22:18:02Z","modified":"2024-08-04T13:45:34Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-03T03:07:28.222143Z"}],"ghsa":[{"id":"GHSA-cvmr-qp3p-228w","title":"A denial of service vulnerability exists in Microsoft Outlook software when the software fails to...","description":"A denial of service vulnerability exists in Microsoft Outlook software when the software fails to properly handle objects in memory, aka 'Microsoft Outlook Denial of Service Vulnerability'.","status":"published","published":"2022-05-24T17:31:01Z","modified":"2024-01-09T05:04:50Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-401"],"updated_at":"2026-11-02T14:55:21.919096Z"}],"nvd":[{"id":"CVE-2020-16949","description":"\u003cp\u003eA denial of service vulnerability exists in Microsoft Outlook software when the software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could cause a remote denial of service against a system.\u003c/p\u003e\n\u003cp\u003eExploitation of the vulnerability requires that a specially crafted email be sent to a vulnerable Outlook server.\u003c/p\u003e\n\u003cp\u003eThe security update addresses the vulnerability by correcting how Microsoft Outlook handles objects in memory.\u003c/p\u003e","status":"published","published":"2020-10-16T23:15:16.18Z","modified":"2026-06-17T02:58:20.243Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-401"],"updated_at":"2026-11-02T14:06:19.351389Z"}]}}