CVE DATABASE / CVE-2026-45498
CVE-2026-45498
Microsoft Defender Denial of Service Vulnerability
CVSS 4 · MEDIUM
⚠ CISA KEV — ACTIVELY EXPLOITED
On the CISA KEV catalog
Confirmed exploited in the wild. Added 2026-05-20.
Federal remediation due 2026-06-03.
Required 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.
Summary
Microsoft Defender Denial of Service Vulnerability
CVSS 3.1 breakdown
| Base score | 4 (MEDIUM) |
| Vector | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| Attack vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity | NONE |
| Availability | LOW |
Weakness type (CWE)
Affected products
Microsoft defender antimalware platform
Check this CVE live
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References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45498
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-45498
Data: NIST NVD + CISA KEV. NVD last modified 2026-05-20. Always verify against the vendor advisory before acting.