CVE-2026-45498

Exploitation

Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2026-05-20. Federal remediation due 2026-06-03.

SSVC decision

• ExploitationactiveCISA reports credible evidence of active exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

63.08% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 99.1% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Analyzed. NVD last modified this record on 2026-07-23.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-05-20 13:09Z3 MO AGO

Last updated

2026-08-10 15:13Z25 DAYS AGO

Reserved

2026-05-12

Assigning CNA

microsoft

Record state

PUBLISHED

Severity

Medium (CVSS 4.0)

CNA 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

Weaknesses

• CWE-400Uncontrolled Resource ConsumptionClass

Data version

5.2

Document digest

76924b3fbaae41c8343b3e5752233b3dc23d11d55c5b6aba603db72d2f03c9f3

• msrc.microsoft.comMicrosoft Defender Denial of Service Vulnerabilityhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45498vendor-advisorypatch
• www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-45498government-resource