{"id":"CVE-2021-34520","title":"Microsoft SharePoint Server Remote Code Execution Vulnerability","summary":"Microsoft SharePoint Server Remote Code Execution Vulnerability","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-502"],"vendor":"microsoft","product":"sharepoint_foundation","affected":["sharepoint_foundation = 2013","sharepoint_server = 2016","sharepoint_server = 2019"],"published":"2021-07-14","updated":"2026-08-10","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-34520","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34520","label":"secure@microsoft.com"},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34520","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-21-828/","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.04389,"epssPercentile":0.90932,"zeroDay":true,"ingestedAt":"2026-08-10T16:41:17.414Z","slug":"CVE-2021-34520","body":"## Overview\n\nMicrosoft SharePoint Server Remote Code Execution Vulnerability\n\n## Affected\n\n- `sharepoint_foundation = 2013`\n- `sharepoint_server = 2016`\n- `sharepoint_server = 2019`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"abyssal","depthScore":70,"depthScoreParts":{"impact":44.6,"likelihood":0.9,"exploitation":25,"ransomware":0},"changes":[]}