CVE-2021-3565

Name: CVE-2021-3565
Creator: NVD / NIST
Published: 2021-06-04T12:15:07.557+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.9/10EPSS 1.34%

Last modified Jun 17, 2026

CVE-2021-3565 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. A flaw was found in tpm2-tools in versions before 5.1.1 and before 4.3.2. tpm2_import used a fixed AES key for the inner wrapper, potentially allowing a MITM attacker to unwrap the inner portion and reveal the key being imported. EPSS estimates a 1.34% chance of exploitation in the next 30 days.

Description

A flaw was found in tpm2-tools in versions before 5.1.1 and before 4.3.2. tpm2_import used a fixed AES key for the inner wrapper, potentially allowing a MITM attacker to unwrap the inner portion and reveal the key being imported. The highest threat from this vulnerability is to data confidentiality.

Metrics

CVSS 3.1

5.9/10

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

EPSS Probability

1.34%

67.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Tpm2-Tools Project	Tpm2-Tools	< 4.3.2
Tpm2-Tools Project	Tpm2-Tools	>= 5.1, < 5.1.1
Redhat	Enterprise Linux	8.0
Fedoraproject	Fedora	33
Fedoraproject	Fedora	34

References

Timeline

Published: Jun 4, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3565?

How severe is CVE-2021-3565?

CVE-2021-3565 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 1.34% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3565?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3565?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST