LOW CISA KEV Actively Exploited

CVE-2026-45498

Microsoft Defender Denial of Service Vulnerability

CVSS v3

LOW

EPSS Score

2.5 %

exploit probability

CISA KEV

Yes

known exploited

Exploitation

active

SSVC status

Description

Microsoft Security Update (CVE-2026-45498)

CISA Known Exploited Vulnerability

Date Added: 2026-05-20
Patch Due Date: 2026-06-03
Ransomware Use: Unknown

Technical details

CVSS v3 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
Published: 2026-06-01
MSRC Title: Microsoft Defender Denial of Service Vulnerability

Frequently asked questions

What is CVE-2026-45498?

Microsoft Security Update (CVE-2026-45498)

Is CVE-2026-45498 actively exploited?

Yes. CVE-2026-45498 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2026-06-03.

What is the CVSS score for CVE-2026-45498?

CVE-2026-45498 has a CVSS v3 base score of 4 (LOW severity), with vector string 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.

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