CVE-2026-45584

⚠️ high

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

CVSS Score

8.1

High

EPSS Score

0.9

Exploit Probability

Published Date

2026-05-20

First Seen: 2026-05-21

This CVE is High Risk - more severe than 76.7% of all 365,968 vulnerabilities in our database.

#85,398

Top 25% most severe

Severity Percentile

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

Requires human interaction

💥 Technical Impact

Total

Complete system compromise possible

SSVC data provided by CISA

Last Modified 2026-07-23

Source NVD 🔗

CVSS Vector 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE IDs (Weakness Types)

CWE-122

📦 Affected Products 1

Vendor	Product	Status	Affected Versions
microsoft	malware_protection_engine	Affected	> 1.1.26030.3008 < 1.1.26040.8

Vendor Advisory

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-69414	⚠️ high	7.8	0.6	Microsoft is aware of an elevation of privilege in the Microsoft Malware Protection Engine in Microsoft Defender publicl...	2026-08-14
CVE-2026-55011	⚠️ high	7.8	0.4	Integer underflow (wrap or wraparound) in Microsoft Defender allows an unauthorized attacker to execute code locally.	2026-07-14
CVE-2026-55012	⚠️ high	7.8	0.4	Integer overflow or wraparound in Microsoft Defender allows an unauthorized attacker to execute code locally.	2026-07-14
CVE-2026-50656	⚠️ high	7.8	10.8	Microsoft is aware of an elevation of privilege in the Microsoft Malware Protection Engine in Microsoft Defender publicl...	2026-06-16
CVE-2026-41091	⚠️ high	7.8	9.6	Improper link resolution before file access ('link following') in Microsoft Defender allows an authorized attacker to el...	2026-05-20
CVE-2023-33156	🔶 medium	6.3	0.1	Microsoft Defender Elevation of Privilege Vulnerability	2023-07-11

These CVEs affect the same products