CVE-2025-53770

Exploitation

Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2025-07-20. Federal remediation due 2025-07-21. Known ransomware campaign use: reported by CISA.

SSVC decision

• ExploitationactiveCISA reports credible evidence of active exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

99.99% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 99.9% of scored records. A rank, not a probability.

NVD base score

9.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Analyzed. NVD last modified this record on 2026-08-04.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2025-07-20 01:06Z1 YR AGO

Last updated

2026-08-04 03:55Z2 MO AGO

Reserved

2025-07-09

Assigning CNA

microsoft

Record state

PUBLISHED

Severity

Critical (CVSS 9.8)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:W/RC:C

Weaknesses

• CWE-502Deserialization of Untrusted DataBase

Data version

5.2

Document digest

9e87e48cb05947d41ef123b6b9de5b8e027bd42559e84fb2501b2afbf6416fe1

• msrc.microsoft.comMicrosoft SharePoint Server Remote Code Execution Vulnerabilityhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770vendor-advisorypatch
• www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-53770government-resource
• msrc.microsoft.comhttps://msrc.microsoft.com/blog/2025/07/customer-guidance-for-sharepoint-vulnerability-cve-2025-53770/
• www.cisa.govhttps://www.cisa.gov/news-events/alerts/2025/07/20/microsoft-releases-guidance-exploitation-sharepoint-vulnerability-cve-2025-53770
• research.eye.securityhttps://research.eye.security/sharepoint-under-siege/
• www.bleepingcomputer.comhttps://www.bleepingcomputer.com/news/microsoft/microsoft-sharepoint-zero-day-exploited-in-rce-attacks-no-patch-available/
• www.forbes.comhttps://www.forbes.com/sites/daveywinder/2025/07/20/microsoft-confirms-ongoing-mass-sharepoint-attack---no-patch-available/
• x.comhttps://x.com/Shadowserver/status/1946900837306868163
• github.comhttps://github.com/kaizensecurity/CVE-2025-53770
• therecord.mediahttps://therecord.media/microsoft-sharepoint-zero-day-vulnerability-exploited-globally
• news.ycombinator.comhttps://news.ycombinator.com/item?id=44629710
• arstechnica.comhttps://arstechnica.com/security/2025/07/sharepoint-vulnerability-with-9-8-severity-rating-is-under-exploit-across-the-globe/
• www.darkreading.comhttps://www.darkreading.com/remote-workforce/microsoft-rushes-emergency-fix-exploited-sharepoint-toolshell-flaw