What’s Vulnerable › Vulnerabilities
CVE-2026-45584: Microsoft Defender Remote Code Execution Vulnerability
- Severity: high (CVSS 8.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.9% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-05-20 · updated 2026-08-10
- Weakness: CWE-122
Description
Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network.
Affected products
- Microsoft Malware Protection Engine: from 1.1.26030.3008 before 1.1.26040.8 — fixed in 1.1.26040.8
- Microsoft Malware Protection Engine: from 1.1.0.0 before 1.1.26040.8 — fixed in 1.1.26040.8
How to fix
Upgrade to a fixed version: Microsoft Malware Protection Engine 1.1.26040.8; Microsoft Malware Protection Engine 1.1.26040.8. Check the vendor advisory for mitigations.
References
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