CVE-2021-3623

Name: CVE-2021-3623
Creator: NVD / NIST
Published: 2022-03-02T23:15:08.623+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.31%

Last modified Jun 17, 2026

CVE-2021-3623 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. A flaw was found in libtpms. The flaw can be triggered by specially-crafted TPM 2 command packets containing illegal values and may lead to an out-of-bounds access when the volatile state of the TPM 2 is marshalled/written or unmarshalled/read. EPSS estimates a 0.31% chance of exploitation in the next 30 days.

Description

A flaw was found in libtpms. The flaw can be triggered by specially-crafted TPM 2 command packets containing illegal values and may lead to an out-of-bounds access when the volatile state of the TPM 2 is marshalled/written or unmarshalled/read. The highest threat from this vulnerability is to system availability.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

0.31%

22.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Libtpms Project	Libtpms	< 0.6.5
Libtpms Project	Libtpms	>= 0.7.0, < 0.7.8
Libtpms Project	Libtpms	>= 0.8.0, < 0.8.4
Redhat	Enterprise Linux	8.0
Fedoraproject	Fedora	34

References

https://bugzilla.redhat.com/show_bug.cgi?id=1976806Issue Tracking, Patch, Third Party Advisory
https://github.com/stefanberger/libtpms/commit/2e6173cPatch, Third Party Advisory
https://github.com/stefanberger/libtpms/commit/2f30d62Patch, Third Party Advisory
https://github.com/stefanberger/libtpms/commit/7981d9aPatch, Third Party Advisory
https://github.com/stefanberger/libtpms/pull/223Issue Tracking, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z7KZSYMTE7Z4BBEZUWO2DIMQDWMGEP46/
https://bugzilla.redhat.com/show_bug.cgi?id=1976806Issue Tracking, Patch, Third Party Advisory
https://github.com/stefanberger/libtpms/commit/2e6173cPatch, Third Party Advisory
https://github.com/stefanberger/libtpms/commit/2f30d62Patch, Third Party Advisory
https://github.com/stefanberger/libtpms/commit/7981d9aPatch, Third Party Advisory
https://github.com/stefanberger/libtpms/pull/223Issue Tracking, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z7KZSYMTE7Z4BBEZUWO2DIMQDWMGEP46/

Timeline

Published: Mar 2, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3623?

How severe is CVE-2021-3623?

CVE-2021-3623 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.31% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3623?

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-2021-3623?

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

Scan your code now

Source: NVD / NIST