CVE ID
CVE-2026-45498
Vulnerability Name
Microsoft Defender Denial of Service Vulnerability
- Project: Microsoft
- Product: Defender
Date
- Date Added: 2026-05-20
- Due Date: 2026-06-03
Description
Microsoft Defender contains an unspecified vulnerability that allows for denial of service.
Known To Be Used in Ransomware Campaigns?
Unknown
Action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Additional Notes
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-45498 ; https://nvd.nist.gov/vuln/detail/CVE-2026-45498
Related Security News
- Microsoft Confirms RoguePlanet Defender Zero-Day, Says Patch is in Development
- Microsoft Defender RoguePlanet Zero-Day Grants SYSTEM Access on Updated Windows
- Critical Windows Netlogon RCE flaw now exploited in attacks
- Microsoft Slams Public Zero-Day Disclosures Amid GitHub Researcher Account Removal
- Microsoft warns of new Defender zero-days exploited in attacks
- Microsoft Warns of Two Actively Exploited Defender Vulnerabilities
- Microsoft Defender vulnerabilities exploited in the wild (CVE-2026-41091, CVE-2026-45498)
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