Vulnerability Intelligence Report
Microsoft Defender Remote Code Execution Vulnerability
CVE-2026-45584
Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network.
No Active Exploit Signals
CVSS Base Score
8.1
HIGH
Exploitability:2.3
Impact Score:5.9
EPSS Probability:0.85%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-122 ↗CWE-122: Heap-based Buffer Overflow
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Microsoft | Microsoft Malware Protection Engine | 1.1.0.0 < 1.1.26040.8 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.852%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Microsoft Corporation · Vendor · USA |
| Reserved | 2026-05-12T19:55:45 |
| Published | 2026-05-20T13:09:44 |
| Patch Date | 2026-05-19 |
| Last Updated | 2026-08-10T15:13:48 |
Community Chatter & Buzz