MSRXVulnerabilities / CVE-2023-21529
CVE-2023-21529
Published 2023-02-14 · published (not yet in NVD)
CVE-2023-21529
Microsoft Exchange Server Remote Code Execution Vulnerability
Exploited in the wild: CISA added it to the Known Exploited Vulnerabilities catalog on 2026-04-13, with a fix-by date of 2026-04-27. Patch it first.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
8.8 HIGH
CVSS 3.1 · CNA
CVSS 3.1 · CNA
59%
chance of exploitation in the next 30 days (EPSS; in the top 1% of all CVEs)
chance of exploitation in the next 30 days (EPSS; in the top 1% of all CVEs)
Microsoft Exchange Server Remote Code Execution Vulnerability
Affected products
- Microsoft Microsoft Exchange Server 2013 Cumulative Update 23: 15.00.0 to < 15.00.1497.047
- Microsoft Microsoft Exchange Server 2016 Cumulative Update 23: 15.01.0 to < 15.01.2507.021
- Microsoft Microsoft Exchange Server 2019 Cumulative Update 11: 15.02.0 to < 15.02.0986.041
- Microsoft Microsoft Exchange Server 2019 Cumulative Update 12: 15.02.0 to < 15.02.1118.025
Weakness: CWE-502
1 references (advisories, patches, write-ups)
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21529 · vendor-advisory, patch
Sources: CVE.org, FIRST EPSS. Missing ones did not answer or have no record yet.