Vulnerability DatabaseCVE-2021-3543
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CVE-2021-3543
Published:June 01, 2021
Updated:April 21, 2026
A flaw null pointer dereference in the Nitro Enclaves kernel driver was found in the way that Enclaves VMs forces closures on the enclave file descriptor. A local user of a host machine could use this flaw to crash the system or escalate their privileges on the system.
Related Resources (8)
https://lore.kernel.org/lkml/20210429165941.27020-2-andraprs@amazon.com/
https://security-tracker.debian.org/tracker/CVE-2021-3543
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3543
https://access.redhat.com/security/cve/CVE-2021-3543
https://lore.kernel.org/lkml/20210429165941.27020-2-andraprs%40amazon.com/
https://bugzilla.redhat.com/show_bug.cgi?id=1953022
https://lore.kernel.org/lkml/20210429165941.27020-1-andraprs@amazon.com/
https://github.com/aws/aws-nitro-enclaves-cli/commit/1d0307fd82653b6b6aa1dcb1b3e34321d18ea900
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CVSS v4
Base Score:
8.4
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
HIGH
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.7
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
CVSS v2
Base Score:
7.2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
Weakness Type (CWE)
Use After Free
CWE-416
EPSS
Base Score:
0.10