CVE-2026-45498
KEVMicrosoft Defender Denial of Service Vulnerability
Description
Microsoft Defender contains an unspecified vulnerability that allows for denial of service.
Microsoft Defender Denial of Service Vulnerability
CVSS 3.1 vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LPublishedMay 20, 2026
Last modifiedJul 23, 2026
Added to KEVMay 20, 2026
Remediation dueJun 3, 2026
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45498Vendor Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-45498Third Party AdvisoryUS Government Resource
0 recent articles mention this CVE
56
Risk assessment · Medium
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 145 days
- CVSS
- 4.0 MEDIUM
- EPSS (30-day exploit probability)
- 63.1% · top 1% of all CVEs
- Weakness
- CWE-400
- Preconditions
- No privileges and no user interaction
Recommended actions
- 1.Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.