What’s Vulnerable › Vulnerabilities

CVE-2021-3623

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-03-02 · updated 2026-06-17
• Weakness: CWE-787

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.

Affected products

• Fedoraproject Fedora: 34
• stefanberger libtpms: before 0.6.5; from 0.7.0 before 0.7.8; from 0.8.0 before 0.8.4 — fixed in 0.6.5, 0.7.8, 0.8.4
• Red Hat Enterprise Linux: 8.0

How to fix

Upgrade to a fixed version: stefanberger libtpms 0.6.5, 0.7.8, 0.8.4. Check the vendor advisory for mitigations.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1976806
• https://github.com/stefanberger/libtpms/commit/2e6173c
• https://github.com/stefanberger/libtpms/commit/2f30d62
• https://github.com/stefanberger/libtpms/commit/7981d9a
• https://github.com/stefanberger/libtpms/pull/223
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z7KZSYMTE7Z4BBEZUWO2DIMQDWMGEP46/
• https://bugzilla.redhat.com/show_bug.cgi?id=1976806
• https://github.com/stefanberger/libtpms/commit/2e6173c
• https://github.com/stefanberger/libtpms/commit/2f30d62
• https://github.com/stefanberger/libtpms/commit/7981d9a
• https://github.com/stefanberger/libtpms/pull/223
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z7KZSYMTE7Z4BBEZUWO2DIMQDWMGEP46/

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