CVEvulnerability

CVE-2026-45498

7.5 HIGH Known exploited Published 2026-05-20 Modified 2026-07-23 Official page ↗

CISA Known Exploited Vulnerability

Microsoft Defender Denial of Service Vulnerability — Microsoft Defender

Microsoft Defender contains an unspecified vulnerability that allows for denial of service.

Added to KEV
2026-05-20
Remediation due
2026-06-03
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.
Notes
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-45498 ; https://nvd.nist.gov/vuln/detail/CVE-2026-45498
Status
Analyzed
Published
2026-05-20
Last modified
2026-07-23
Assigner
[email protected]
CVSS 3.1 ([email protected])
4.0 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-400

Description

Microsoft Defender Denial of Service Vulnerability

Affected configurations

• microsoft defender antimalware platform (< 4.18.26040.7)

Related

Weakness · CWE (1)

  • CWE-400 Uncontrolled Resource Consumption weakness

References