CVE-2026-55011: high-severity vulnerability in Microsoft Malware Protection Engine
Microsoft Defender Remote Code Execution Vulnerability
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.8epss 0.5%
Integer underflow (wrap or wraparound) in Microsoft Defender allows an unauthorized attacker to execute code locally.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Affected products
Microsoft · Microsoft Malware Protection EngineRelated CVEs — Microsoft Malware Protection Engine
In the same product, most dangerous first.
CVE-2026-41091HIGHMicrosoft Defender Elevation of Privilege VulnerabilityEPSS 8.2%KEVCVE-2026-50656HIGHMicrosoft Defender Elevation of Privilege VulnerabilityEPSS 11.2%CVE-2021-31985HIGHMicrosoft Defender Remote Code Execution VulnerabilityEPSS 7.8%CVE-2021-42298HIGHMicrosoft Defender Remote Code Execution VulnerabilityEPSS 5.8%CVE-2023-24860HIGHMicrosoft Defender Denial of Service VulnerabilityEPSS 3.1%CVE-2022-24548MEDIUMMicrosoft Defender Denial of Service VulnerabilityEPSS 3.0%