CVE-2021-42298
Microsoft Defender Remote Code Execution Vulnerability
Microsoft Defender Remote Code Execution Vulnerability
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
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
Microsoft Defender Remote Code Execution Vulnerability
- Record
CVE-2021-42298- CVSS 3.1
- 7.8 High
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 - Updated
- 2026-11-02
EUVDEUVD-2021-29273
Microsoft Defender Remote Code Execution Vulnerability
- Record
EUVD-2021-29273- CVSS 3.1
- 7.8 High
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 - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-hrr5-6mf9-3wxh
Microsoft Defender Remote Code Execution Vulnerability
Microsoft Defender Remote Code Execution Vulnerability
- Record
GHSA-hrr5-6mf9-3wxh- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Weakness
- CWE-94
- Updated
- 2026-11-02
NVD
Microsoft Defender Remote Code Execution Vulnerability
- Record
CVE-2021-42298- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS 2.0
- 9.3 High
AV:N/AC:M/Au:N/C:C/I:C/A:C - Weakness
- CWE-94
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-42298 is a high vulnerability (CVSS 7.8) in Microsoft Malware Protection Engine, published November 10, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 5.85%, the 93rd percentile. No source names a fixed version.