CVE-2026-45584
Microsoft Defender Remote Code Execution Vulnerability
Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Microsoft Defender Remote Code Execution Vulnerability
Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network.
- Record
CVE-2026-45584- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Weakness
- CWE-122
- Updated
- 2026-11-02
EUVDEUVD-2026-31105
Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network.
- Record
EUVD-2026-31105- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-f7rp-9ghh-f4gm
Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code...
Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network.
- Record
GHSA-f7rp-9ghh-f4gm- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-122
- Updated
- 2026-11-02
NVD
Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network.
- Record
CVE-2026-45584- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-122
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | 96613686/CVE-2026-45584 | 2026-05-22 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-45584 is a high vulnerability (CVSS 8.1) in Microsoft Malware Protection Engine, published May 20, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.85%, the 58th percentile. No source names a fixed version.