{"id":"CVE-2025-53770","url":"https://www.cyber-defence.io/tools/cve/CVE-2025-53770","generatedAt":"2026-10-31T02:44:23.683Z","title":"Microsoft SharePoint Deserialization of Untrusted Data Vulnerability","description":"Deserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized attacker to execute code over a network.\nMicrosoft is aware that an exploit for CVE-2025-53770 exists in the wild.\nMicrosoft is preparing and fully testing a comprehensive update to address this vulnerability.  In the meantime, please make sure that the mitigation provided in this CVE documentation is in place so that you are protected from exploitation.","published":"2025-07-20T01:15:31.000Z","lastModified":"2026-08-04T05:16:35.000Z","status":"Analyzed","sourceIdentifier":"secure@microsoft.com","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-502"],"affected":["microsoft/sharepoint server"],"epss":{"score":0.99999,"percentile":0.99991,"date":"2026-10-29","history":[]},"kev":{"listed":true,"dateAdded":"2025-07-20","dueDate":"2025-07-21","knownRansomwareCampaignUse":"Known","notes":"Disconnect public-facing versions of SharePoint Server that have reached their end-of-life (EOL) or end-of-service (EOS) to include SharePoint Server 2013 and earlier versions. For supported versions, please follow the mitigations according to CISA (URL listed below in Notes) and vendor instructions (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.\nCISA Mitigation Instructions: https://www.cisa.gov/news-events/alerts/2025/07/20/microsoft-releases-guidance-exploitation-sharepoint-vulnerability-cve-2025-53770; https://www.microsoft.com/en-us/security/blog/2025/07/22/disrupting-active-exploitation-of-on-premises-sharepoint-vulnerabilities/ ; https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770 ; https://nvd.nist.gov/vuln/detail/CVE-2025-53770"},"exploits":{"count":1,"verified":false,"firstPublished":"2025-08-11","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":52405,"kind":"exploit","title":"Microsoft SharePoint Server 2019 (16.0.10383.20020) - Remote Code Execution (RCE)","url":"https://www.exploit-db.com/exploits/52405","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/windows/remote/52405.py","file":"exploits/windows/remote/52405.py","published":"2025-08-11","added":"2025-08-11","updated":"2025-08-11","author":"Agampreet Singh","type":"remote","platform":"windows","port":null,"verified":false,"codes":["CVE-2025-53770"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":null}]},"verdict":{"level":"urgent","text":"Known to be exploited in the wild (CISA KEV, CISA remediation deadline 21 July 2025). Treat as an emergency change: patch or isolate now, then hunt for prior compromise."},"changes":[],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770","tags":["Vendor Advisory"],"source":"secure@microsoft.com"},{"url":"https://arstechnica.com/security/2025/07/sharepoint-vulnerability-with-9-8-severity-rating-is-under-exploit-across-the-globe/","tags":["Exploit","Press/Media Coverage"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/kaizensecurity/CVE-2025-53770","tags":["Exploit"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://msrc.microsoft.com/blog/2025/07/customer-guidance-for-sharepoint-vulnerability-cve-2025-53770/","tags":["Mitigation","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://news.ycombinator.com/item?id=44629710","tags":["Issue Tracking"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://research.eye.security/sharepoint-under-siege/","tags":["Exploit","Mitigation","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://therecord.media/microsoft-sharepoint-zero-day-vulnerability-exploited-globally","tags":["Press/Media Coverage"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.bleepingcomputer.com/news/microsoft/microsoft-sharepoint-zero-day-exploited-in-rce-attacks-no-patch-available/","tags":["Press/Media Coverage"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cisa.gov/news-events/alerts/2025/07/20/microsoft-releases-guidance-exploitation-sharepoint-vulnerability-cve-2025-53770","tags":["Mailing List","Third Party Advisory","US Government Resource"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.darkreading.com/remote-workforce/microsoft-rushes-emergency-fix-exploited-sharepoint-toolshell-flaw","tags":["Press/Media Coverage"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.forbes.com/sites/daveywinder/2025/07/20/microsoft-confirms-ongoing-mass-sharepoint-attack---no-patch-available/","tags":["Press/Media Coverage"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://x.com/Shadowserver/status/1946900837306868163","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-53770","tags":["US Government Resource"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-53770","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}