A 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.
\nExploitation of the vulnerability requires that a specially crafted email be sent to a vulnerable Outlook server.
\nThe security update addresses the vulnerability by correcting how Microsoft Outlook handles objects in memory.
","publishedAt":"2020-10-16T22:18:02.000Z","updatedAt":"2024-08-04T13:45:34.666Z","severity":{"score":4.7,"label":"Medium","version":"3.1","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","source":"microsoft"},"assigner":"microsoft","products":["Microsoft Microsoft Office 2019","Microsoft Microsoft 365 Apps for Enterprise","Microsoft Microsoft Outlook 2016","Microsoft Microsoft Outlook 2013 Service Pack 1","Microsoft Microsoft Outlook 2010 Service Pack 2"],"affected":[{"vendor":"Microsoft","product":"Microsoft Office 2019","versions":[{"version":"19.0.0","status":"affected","lessThan":"https://aka.ms/OfficeSecurityReleases","versionType":"custom"}],"cpes":["cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:*:*"],"platforms":["32-bit Systems","x64-based Systems"]},{"vendor":"Microsoft","product":"Microsoft 365 Apps for Enterprise","versions":[{"version":"16.0.1","status":"affected","lessThan":"https://aka.ms/OfficeSecurityReleases","versionType":"custom"}],"cpes":["cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:*:*"],"platforms":["32-bit Systems","x64-based Systems"]},{"vendor":"Microsoft","product":"Microsoft Outlook 2016","versions":[{"version":"16.0.0.0","status":"affected","lessThan":"publication","versionType":"custom"}],"cpes":["cpe:2.3:a:microsoft:outlook:2016:*:*:*:*:x86:*:*","cpe:2.3:a:microsoft:outlook:2016:*:*:*:*:x64:*:*"],"platforms":["32-bit Systems","x64-based Systems"]},{"vendor":"Microsoft","product":"Microsoft Outlook 2013 Service Pack 1","versions":[{"version":"15.0.0.0","status":"affected","lessThan":"publication","versionType":"custom"}],"cpes":["cpe:2.3:a:microsoft:outlook:2013:*:*:*:*:x86:*:*","cpe:2.3:a:microsoft:outlook:2013:*:*:*:*:*:x64:*","cpe:2.3:a:microsoft:outlook:2013:*:*:*:rt:*:*:*"],"platforms":["32-bit Systems","x64-based Systems","ARM64-based Systems"]},{"vendor":"Microsoft","product":"Microsoft Outlook 2010 Service Pack 2","versions":[{"version":"13.0.0.0","status":"affected","lessThan":"publication","versionType":"custom"}],"cpes":["cpe:2.3:a:microsoft:outlook:2010:sp2:*:*:*:*:*:*"],"platforms":["32-bit Systems","x64-based Systems"]}],"references":["https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16949"],"weaknesses":[],"ingestedAt":"2026-10-29T19:46:39.756Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2020/16xxx/CVE-2020-16949.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2020-16949","state":"PUBLISHED","datePublished":"2020-10-16T22:18:02.000Z","dateUpdated":"2024-08-04T13:45:34.666Z","assignerShortName":"microsoft","assignerOrgId":"f38d906d-7342-40ea-92c1-6c4a2c6478c8","dateReserved":"2020-08-04T00:00:00.000Z"},"containers":{"cna":{"title":"Microsoft Outlook Denial of Service Vulnerability","descriptions":[{"lang":"en-US","value":"A 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.
\nExploitation of the vulnerability requires that a specially crafted email be sent to a vulnerable Outlook server.
\nThe security update addresses the vulnerability by correcting how Microsoft Outlook handles objects in memory.
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