[Vulnerability Alert] Microsoft Exchange Server Has a Major Security Vulnerability (CVE-2025-59249)

• Subject: [Vulnerability Alert] Microsoft Exchange Server Has a Major Security Vulnerability (CVE-2025-59249)

• Content:
  • Forwarded from Taiwan Computer Network Emergency Response Team/Coordination Center TWCERTCC-200-202510-00000009
  • Microsoft has issued a major security vulnerability advisory for its Exchange Server product (CVE-2025-59249, CVSS: 8.8). This vulnerability is a weak authentication vulnerability that allows an authenticated attacker to elevate privileges over the network.
• Affected Platforms:
  • Microsoft Exchange Server Subscription Edition RTM
  • Microsoft Exchange Server 2019 Cumulative Update 15
  • Microsoft Exchange Server 2019 Cumulative Update 14
  • Microsoft Exchange Server 2016 Cumulative Update 23
• Recommended Action:
  • Apply the patch according to the solutions released on the official website: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59249
• References:
  • https://www.twcert.org.tw/tw/cp-169-10447-4a433-1.html

Computer and Communications Center
Network Systems Group