CVE-2020-26933

Name: CVE-2020-26933
Creator: NVD / NIST
Published: 2020-11-18T17:15:11.68+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6/10EPSS 0.30%

Last modified Jun 17, 2026

CVE-2020-26933 is a medium-severity vulnerability rated 6/10 on the CVSS scale. Trusted Computing Group (TCG) Trusted Platform Module Library Family 2.0 Library Specification Revisions 1.38 through 1.59 has Incorrect Access Control during a non-orderly TPM shut-down that uses USE_DA_USED. Improper initialization of this shut-down may result in susceptibility to a dictionary attack.. EPSS estimates a 0.30% chance of exploitation in the next 30 days.

Description

Trusted Computing Group (TCG) Trusted Platform Module Library Family 2.0 Library Specification Revisions 1.38 through 1.59 has Incorrect Access Control during a non-orderly TPM shut-down that uses USE_DA_USED. Improper initialization of this shut-down may result in susceptibility to a dictionary attack.

Metrics

CVSS 3.1

6/10

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

EPSS Probability

0.30%

21.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-665

Affected Software

Vendor	Product	Versions	Update
Trustedcomputinggroup	Trusted Platform Module	2.0	Revision 1.38

References

https://trustedcomputinggroup.org/about/security/Vendor Advisory
https://trustedcomputinggroup.org/wp-content/uploads/TCGVRT004-Advisory-FINAL.pdfVendor Advisory
https://trustedcomputinggroup.org/about/security/Vendor Advisory
https://trustedcomputinggroup.org/wp-content/uploads/TCGVRT004-Advisory-FINAL.pdfVendor Advisory

Timeline

Published: Nov 18, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-26933?

How severe is CVE-2020-26933?

CVE-2020-26933 has a CVSS score of 6/10 (MEDIUM severity). The EPSS model estimates a 0.30% probability of exploitation in the next 30 days.

How do I fix CVE-2020-26933?

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-2020-26933?

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

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Source: NVD / NIST