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Fencer Intel
medium 5.9

CVE-2021-3565 json

A flaw was found in tpm2-tools in versions before 5.1.1 and before 4.3.2.

published 5y ago modified 4mo ago also EUVD-2021-26875

cvss
5.9
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 71%
public exploits
0
none known

Summary

A flaw was found in tpm2-tools in versions before 5.1.1 and before 4.3.2. tpm2_import used a fixed AES key for the inner wrapper, potentially allowing a MITM attacker to unwrap the inner portion and reveal the key being imported. The highest threat from this vulnerability is to data confidentiality.

Patch / fix

  • tpm2-tools_project tpm2-tools 4.3.2, 5.1.1
  • tpm2-tools Debian 14, Debian 13, Debian 12 5.0-2

debian advisories DEBIAN-CVE-2021-3565

  • tpm2-tools RHEL 8 4.1.1-5.el8

red hat advisories RHSA-2021:4413

  • tpm2.0-tools SLE Module for Basesystem 15 SP2 4.1-3.3.1
  • tpm2.0-tools SLE Module for Basesystem 15 SP3 4.3.0-4.3.1

suse advisories SUSE-SU-2021:1999-1SUSE-SU-2021:1998-1

  • tpm2.0-tools openSUSE Tumbleweed 5.1.1-3.2
  • tpm2.0-tools openSUSE Leap 15.3 4.3.0-4.3.1
  • tpm2.0-tools openSUSE Leap 15.2 4.1-lp152.2.3.1

opensuse advisories openSUSE-SU-2024:11471-1openSUSE-SU-2021:1998-1openSUSE-SU-2021:0934-1

  • tpm2-tools AlmaLinux 8 4.1.1-5.el8

almalinux advisories ALSA-2021:4413

  • tpm2-tools Rocky Linux 8 4.1.1-5.el8

rocky linux advisories RLSA-2021:4413

  • tpm2-tools CBL-Mariner 2.0 4.2-2

azure linux advisories AZL-6923

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • tpm2-tools Arch Linux 5.1.1-1

arch linux advisories AVG-1986

Is CVE-2021-3565 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2021-3565 updated cvss 4.4

tpm2-tools: fixed AES wrapping key in tpm2_import

  • Red Hat Enterprise Linux BaseOS (v. 8) tpm2-tools 4.1.1-5.el8
    fixed: vendor fix RHSA-2021:4413
  • Red Hat Enterprise Linux 7 tpm2-tools Red Hat Enterprise Linux 9 tpm2-tools
    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

1.33% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N

Affected products

  • n/a tpm2-tools

Classification

Weakness
  • CWE-665 Improper Initialization
  • CWE-798 Use of Hard-coded Credentials

References

Sources

Fencer Intel 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.