{"schema":"threatline.record/2","record":{"id":"CVE-2025-53770","aliases":[],"summary":"Microsoft SharePoint Deserialization of Untrusted Data Vulnerability","details":"Microsoft SharePoint Server on-premises contains a deserialization of untrusted data vulnerability that could allow an unauthorized attacker to execute code over a network. This vulnerability could be chained with CVE-2025-53771. CVE-2025-53770 is a patch bypass for CVE-2025-49704, and the updates for CVE-2025-53770 include more robust protection than those for CVE-2025-49704.","categories":["Applications & CMS"],"product":"SharePoint","vendor":"Microsoft","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2025-53770","source_modified_at":"2026-08-04T03:55:52.588Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Microsoft SharePoint Enterprise Server 2016","vendor":"Microsoft","versions":[{"version":"16.0.0","lessThan":"16.0.5513.1001","versionType":"custom","status":"affected"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2025-53770","source_modified_at":"2026-08-04T03:55:52.588Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Microsoft SharePoint Server 2019","vendor":"Microsoft","versions":[{"version":"16.0.0","lessThan":"16.0.10417.20037","versionType":"custom","status":"affected"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2025-53770","source_modified_at":"2026-08-04T03:55:52.588Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Microsoft SharePoint Server Subscription Edition","vendor":"Microsoft","versions":[{"version":"16.0.0","lessThan":"16.0.18526.20508","versionType":"custom","status":"affected"}],"defaultStatus":null}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2025-53770","source_modified_at":"2026-08-04T03:55:52.588Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Microsoft SharePoint Enterprise Server 2016","ecosystem":null},"version":"16.0.5513.1001","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2025-53770","source_modified_at":"2026-08-04T03:55:52.588Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Microsoft SharePoint Server 2019","ecosystem":null},"version":"16.0.10417.20037","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2025-53770","source_modified_at":"2026-08-04T03:55:52.588Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Microsoft SharePoint Server Subscription Edition","ecosystem":null},"version":"16.0.18526.20508","basis":"first unaffected version stated in the CVE record"}],"cvss":9.8,"severity":"Critical","kev":{"listed":true,"date_added":"2025-07-20","due_date":"2025-07-21","required_action":"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.","ransomware_campaign_use":"Known"},"epss":{"probability":0.99999,"percentile":0.99992,"score_date":"2026-10-23"},"published_at":"2025-07-20T01:06:33.607Z","modified_at":"2026-08-04T03:55:52.588Z","provenance":[{"source":"CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T17:00:09.9001Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2025-53770","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-08-04T03:55:52.588Z"},{"source":"Metasploit","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/http/sharepoint_toolpane_rce.rb","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2025-07-08"},{"source":"Exploit-DB","url":"https://www.exploit-db.com/exploits/52405","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2025-08-11"},{"source":"Nuclei","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-53770.yaml","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":null},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2025-53770","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CISA KEV","CVE List","Metasploit","Exploit-DB","Nuclei","EPSS"],"references":[{"url":"https://www.microsoft.com/en-us/security/blog/2025/07/22/disrupting-active-exploitation-of-on-premises-sharepoint-vulnerabilities/","source":"CISA KEV"},{"source":"CVE List","url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770","tags":["vendor-advisory","patch"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-53770","source":"CISA KEV"},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-53770","tags":["government-resource"]},{"source":"CVE List","url":"https://msrc.microsoft.com/blog/2025/07/customer-guidance-for-sharepoint-vulnerability-cve-2025-53770/"},{"source":"CVE List","url":"https://www.cisa.gov/news-events/alerts/2025/07/20/microsoft-releases-guidance-exploitation-sharepoint-vulnerability-cve-2025-53770"},{"source":"CVE List","url":"https://research.eye.security/sharepoint-under-siege/"},{"source":"CVE List","url":"https://www.bleepingcomputer.com/news/microsoft/microsoft-sharepoint-zero-day-exploited-in-rce-attacks-no-patch-available/"},{"source":"CVE List","url":"https://www.forbes.com/sites/daveywinder/2025/07/20/microsoft-confirms-ongoing-mass-sharepoint-attack---no-patch-available/"},{"source":"CVE List","url":"https://x.com/Shadowserver/status/1946900837306868163"},{"source":"CVE List","url":"https://github.com/kaizensecurity/CVE-2025-53770"},{"source":"CVE List","url":"https://therecord.media/microsoft-sharepoint-zero-day-vulnerability-exploited-globally"},{"source":"CVE List","url":"https://news.ycombinator.com/item?id=44629710"},{"source":"CVE List","url":"https://arstechnica.com/security/2025/07/sharepoint-vulnerability-with-9-8-severity-rating-is-under-exploit-across-the-globe/"},{"source":"CVE List","url":"https://www.darkreading.com/remote-workforce/microsoft-rushes-emergency-fix-exploited-sharepoint-toolshell-flaw"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"active","automatable":"yes","technical_impact":"total","assessed_at":"2025-07-20T00:00:00+00:00"},"exploits":[{"source":"Metasploit","kind":"Exploit module","name":"Microsoft SharePoint Server ToolPane Unauthenticated Remote Code Execution (aka ToolShell)","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/http/sharepoint_toolpane_rce.rb","date":"2025-07-08","added":"2026-06-02","check":true},{"source":"Exploit-DB","kind":"Remote exploit","name":"Microsoft SharePoint Server 2019 (16.0.10383.20020) - Remote Code Execution (RCE)","url":"https://www.exploit-db.com/exploits/52405","date":"2025-08-11","added":"2025-08-11","verified":false},{"source":"Nuclei","kind":"Scanner template","name":"Microsoft SharePoint Server - Remote Code Execution (ToolShell)","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-53770.yaml"}],"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-08-04T03:55:52.588Z","content_hash":"2c3998f77d5612032bbc568bcd24ec19f74daaaf8701ca725ce5e307316431e3"}}