CVE-2026-45498

Microsoft Defender allows denial of service via unspecified vulnerability, impacting DIB systems reliant on endpoint protection.

This DoS vulnerability in Microsoft Defender can disrupt critical security monitoring and endpoint protection services, potentially leaving DIB organizations exposed to unpatched attack surfaces. While not an RCE or zero-day, the active exploitation status and high severity warrant immediate patching to maintain FedRAMP/NIST 800-171 compliance.

Shame score — A DoS vulnerability is less critical than RCE or data breaches but still represents a significant operational risk that compromises security posture.