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CVE-2026-45498

MEDIUM 4 KNOWN EXPLOITED

Published 2026-05-20 · Last modified 2026-06-19

Microsoft Defender Denial of Service Vulnerability

ACTIVELY EXPLOITED

Confirmed exploited in the wild — in CISA KEV since 2026-05-20. Patch or mitigate now.

Exploitation likelihood

63.1%chance of exploitation in 30 days · 99th percentile

● In CISA KEV (2026-05-20) ○ Public exploit / PoC

Impact if exploited

4CVSS 3.1 · MEDIUM

  • ConfidentialityNone
  • IntegrityNone
  • AvailabilityLow

What an attacker needs

  • ⚠Access: Requires local access to the host
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Affected

Vendors Microsoft

Products Microsoft Defender Antimalware Platform

Weakness (CWE)

  • CWE-400: Uncontrolled resource consumption

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C

References

Patches & mitigations

Advisories

Sources: NVD · CVE.org · EPSS