Microsoft Exchange Server Flaws Allow Network-Based Spoofing and Data Tampering

Microsoft has disclosed critical security vulnerabilities in Exchange Server that could enable attackers to conduct network-based spoofing attacks and tamper with sensitive data, according to security bulletins released on August 12, 2025.

The vulnerabilities, identified as CVE-2025-25007 and CVE-2025-25005, pose significant risks to organizations running Microsoft’s email and collaboration platform.

Critical Exchange Server Vulnerabilities Identified

The newly discovered flaws affect Microsoft Exchange Server deployments worldwide, with both vulnerabilities carrying an “Important” severity rating.

CVE-2025-25007 addresses a spoofing vulnerability that stems from improper validation of syntactic correctness of input, while CVE-2025-25005 involves a tampering vulnerability caused by improper input validation mechanisms.

CVE-2025-25007, the spoofing vulnerability, presents a particularly concerning attack vector as it can be exploited remotely over the network without requiring authentication or ...