Over 28,000 Microsoft Exchange Servers Exposed Online to CVE-2025-53786 Vulnerability
The cybersecurity community faces a significant threat as scanning data reveals over 28,000 unpatched Microsoft Exchange servers remain exposed on the public internet, vulnerable to a critical security flaw designated CVE-2025-53786. The vulnerability affects Microsoft Exchange Server hybrid deployments, with scanning data from The Shadowserver Foundation identifying the United States, Germany, and Russia as the top three countries harboring the highest concentrations of exposed vulnerable servers. The Cybersecurity and Infrastructure Security Agency (CISA) has assessed this as a high-severity vulnerability with significant implications for enterprise security.