What is CVE-2021-3569?

CVE-2021-3569 is a medium-severity vulnerability in Libtpms Project, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.5/10. Published 2021-06-03.

How severe is CVE-2021-3569?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Buffer overflow in Libtpms Project

CVE-2021-3569

A stack corruption bug was found in libtpms in versions before 0.7.2 and before 0.8.0 while decrypting data using RSA. This flaw could result in a SIGBUS (bad memory access) and termination of swtpm. The highest threat from this vulnerability is to system availability.

Vulnerability class: Buffer Overflow

Published 2021-06-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.003 (15.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 15.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Libtpms Project
Red Hat Enterprise Linux — versions 8.0
Libtpms — versions libtpms 0.7.2, libtpms 0.8.0

Weakness classification (CWE)

References

bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-3569?: CVE-2021-3569 is a medium-severity vulnerability in Libtpms Project, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.5/10. Published 2021-06-03.
How severe is CVE-2021-3569?: Medium severity. CVSS v3 base score is 5.5 out of 10.