HIGH
CVE-2023-21529
CVSS
8.8
KEV
Description
Microsoft Exchange Server Remote Code Execution Vulnerability
Weakness (CWE)
CWE-502
Deserialization of Untrusted Data
EPSS Score
59.29%
Probability of exploitation in next 30 days
99.1th percentile
References
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21529
Patch, Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-21529
US Government Resource
https://www.microsoft.com/en-us/security/blog/2026/04/06/storm-1175-focuses-gaze-on-vulnerable-web-facing-assets-in-high-tempo-medusa-ransomware-operations/
Technical Description
Base CVE data derived from NVD (public domain). Enrichment by
dbcve.org
(CC-BY-4.0). Fetched via API.