MSRXVulnerabilities / CVE-2026-45498
CVE-2026-45498
Published 2026-05-20 · published (not yet in NVD)
CVE-2026-45498
Microsoft Defender Denial of Service Vulnerability
Exploited in the wild: CISA added it to the Known Exploited Vulnerabilities catalog on 2026-05-20, with a fix-by date of 2026-06-03. Patch it first.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
4.0 MEDIUM
CVSS 3.1 · CNA
CVSS 3.1 · CNA
63%
chance of exploitation in the next 30 days (EPSS; in the top 1% of all CVEs)
chance of exploitation in the next 30 days (EPSS; in the top 1% of all CVEs)
Microsoft Defender Denial of Service Vulnerability
Affected products
- Microsoft Microsoft Defender Antimalware Platform: 4.0.0.0 to < 4.18.26040.7
Weakness: CWE-400
1 references (advisories, patches, write-ups)
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45498 · vendor-advisory, patch
Sources: CVE.org, FIRST EPSS. Missing ones did not answer or have no record yet.