CVE-2026-45498: Microsoft Defender Denial of Service Vulnerability
Medium · CVSS 4.0 (CVSS 3.1)KEV known exploitedEPSS 63.1%, 99th percentilePublished Updated Assigner: microsoft
In CISA’s Known Exploited Vulnerabilities catalog: Microsoft Defender Denial of Service Vulnerability.
Added , federal remediation due . Known ransomware use: Unknown.
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.
Description
Microsoft Defender Denial of Service Vulnerability
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 · CWE-400
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
Microsoft: Microsoft Defender Antimalware Platform
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45498 (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)