A stack corruption bug was found in libtpms in versions before 0.7.2 and before 0.8.0 while decrypting data using RSA.

published 2021-06-03 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-26879

cvss: 5.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 17%
public exploits: 0; none known

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.

Patch / fix

fixed in 1 distros 1 links 1

libtpms_project libtpms 0.7.2, 0.8.0

libtpms Debian 14, Debian 13, Debian 12 0.8.2-1

debian advisories DEBIAN-CVE-2021-3569

bugzilla.redhat.com/show_bug.cgi?id=1964358 advisory

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-3569 updated 2026-11-07 cvss 6.2

libtpms: stack corruption bug in RSA decryption

Red Hat Enterprise Linux 8 Advanced Virtualization libtpms
affected: no fix planned “Will not fix”
Red Hat Enterprise Linux 8 Advanced Virtualization libtpms Red Hat Enterprise Linux 9 libtpms
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 17% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	2.1	AV:L/AC:L/Au:N/C:N/I:N/A:P

Affected products

n/a libtpms

Classification

Weakness

CWE-120 Buffer Copy without Checking Size of Input
CWE-787 Out-of-bounds Write

References

bugzilla.redhat.com /show_bug.cgi?id=1964358
issue-tracking, patch, third-party-advisory

Sources

CVE List CVE-2021-3569
NVD CVE-2021-3569

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary