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CVE-2026-45584CriticalRevised 26 May

Microsoft Defender Remote Code Execution Vulnerability

MSRC advisory NVD CVE.org

Assessment

Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network.

Severity
Critical
CVSS base score
8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Impact
Remote Code Execution
EPSS, next 30 days
0.7%Higher than 51.6% of scored CVEs · FIRST model run 29 Sep 2026 · about EPSS
Public exploit code
No Nuclei template lists it
Exploitability
Not assessed
Publicly disclosed
No
Customer action
Required: apply the update
Component
Microsoft Defender
Weakness
CWE-122: Heap-based Buffer Overflow
Issued by
Microsoft
Published
19 May 2026 · May 2026
Last revised
26 May 2026In the Security Updates table, added links to the Release Notes. This is an informational change only.

Updates that fix it

0 KBs

No KB listed

MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.

Affected products

System Center
1 affected product
  • Microsoft Malware Protection Engine
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