# CVE-2025-53770: Microsoft SharePoint Server - RCE

> Live exploitation tracking for CVE-2025-53770 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2025-53770

## Key facts

- **Exploitation phase:** Background Noise. Continuous low-level scanning or exploitation attempts are observed, mostly opportunistic and automated.
- **CVSS score:** 9.8
- **Public exploit available:** Yes
- **Affected products:** Microsoft SharePoint Server
- **Weaknesses:** CWE-502 (Deserialization of Untrusted Data)
- **Tags:** enterprise_software, windows

## Description

Deserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized attacker to execute code over a network.

## CrowdSec analysis

[CVE-2025-53770](https://euvd.enisa.europa.eu/vulnerability/CVE-2025-53770) is a vulnerability in Microsoft SharePoint Server that allows an unauthorized attacker to execute code over a network. This issue affects on-premises installations of SharePoint Server.

CrowdSec has been tracking this vulnerability and its exploits since 21st of July 2025.

According to CrowdSec data, while opportunistic exploitation dominates, a portion of threat actors trying to exploit CVE-2025-53770 apply basic targeting methods such as port or service detection. This indicates emerging patterns of selective targeting.
CrowdSec network telemetry also shows that exploitation of CVE-2025-53770 has significantly declined over the past week. Attack volumes are well below the long-term average, suggesting attackers are rapidly losing interest. The vulnerability appears to be falling out of active use across most threat landscapes.

Attackers can exploit this vulnerability by sending specially crafted requests to the SharePoint Server, targeting `/_layouts/15/ToolPane.aspx` with a special Referer header.

## Timeline

- 2025-07-19: CVE Published. CVE-2025-53770 is published to NVD.
- 2025-07-20: CISA KEV. CVE-2025-53770 is added to the Known Exploited Vulnerabilities catalog by CISA.
- 2025-07-21: Rule Released. CrowdSec releases a rule to detect CVE-2025-53770 exploitation attempts against the CrowdSec Network.
- 2025-07-21: CrowdSec First Seen. CrowdSec observes in-the-wild exploitation of CVE-2025-53770 for the first time.
- 2025-07-21: CISA Remediation Deadline. Expiration of the CISA remediation deadline as described in [BOD 22-01](https://www.cisa.gov/news-events/directives/bod-22-01-reducing-significant-risk-known-exploited-vulnerabilities).

## References

- https://nvd.nist.gov/vuln/detail/CVE-2025-53770
- https://www.cisa.gov/news-events/alerts/2025/07/20/microsoft-releases-guidance-exploitation-sharepoint-vulnerability-cve-2025-53770
- https://github.com/kaizensecurity/CVE-2025-53770

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2025-53770) follows observed exploitation activity for CVE-2025-53770. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.