Vulnerability
CVE-2025-53770
Microsoft SharePoint: unauthenticated unsafe deserialization leading to code execution
Most severe levelDEFCON 4 · Moderate risk
Official data
- CVSS 3.1
- 9.8 · critical
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 - Weakness
- CWE-502
- EPSS
- 100% estimated probability of new attacks in the next 30 days, higher than 99% of CVEs. It is already exploited: according to FIRST, the KEV catalogue takes precedence over the estimate.
- CISA KEV catalogue
- Yes, since 20 July 2025 · used in ransomware campaigns
Sources: NVD (CVSS, weakness, publication), FIRST (EPSS), CISA (KEV catalogue).
Data read on 15 November 2026.
Timeline
- 20 July 2025Published on NVD
- 20 July 2025Added to the CISA KEV catalogue
In DefenceLevel briefings1 day
- 6 November 2026New in the last 24 hoursDEFCON 4
Last 12 months.
The full analysis is in the briefingThe full analysis is in your archive
Why it matters now, who is affected and what to do: every day at 05:00 UTC, for subscribers.Why it matters, who is affected and what to do, as in the daily briefing.
More exploited Microsoft vulnerabilities