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CVE-2021-3505

A flaw was found in libtpms in versions before 0.8.0. The TPM 2 implementation returns 2048 bit...

5.5 MediumFix available

A flaw was found in libtpms in versions before 0.8.0. The TPM 2 implementation returns 2048 bit keys with ~1984 bit strength due to a bug in the TCG specification. The bug is in the key creation algorithm in RsaAdjustPrimeCandidate(), which is called before the prime number check. The highest threat from this vulnerability is to data confidentiality.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.40%Down 0.2 points since Apr 20, 2021
90%50%10%1%

What each source reports

NVD Score used 5.5

A flaw was found in libtpms in versions before 0.8.0. The TPM 2 implementation returns 2048 bit keys with ~1984 bit strength due to a bug in the TCG specification. The bug is in the key creation algorithm in RsaAdjustPrimeCandidate(), which is called before the prime number check. The highest threat from this vulnerability is to data confidentiality.

Record
CVE-2021-3505
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0
2.1 LowAV:L/AC:L/Au:N/C:P/I:N/A:N
Weakness
CWE-331
Updated
2026-11-02
CVE List No score

A flaw was found in libtpms in versions before 0.8.0. The TPM 2 implementation returns 2048 bit keys with ~1984 bit strength due to a bug in the TCG specification. The bug is in the key creation algorithm in RsaAdjustPrimeCandidate(), which is called before the prime number check. The highest threat from this vulnerability is to data confidentiality.

Record
CVE-2021-3505
Weakness
CWE-331
Updated
2026-11-02
EUVDEUVD-2021-26824 No score

A flaw was found in libtpms in versions before 0.8.0. The TPM 2 implementation returns 2048 bit keys with ~1984 bit strength due to a bug in the TCG specification. The bug is in the key creation algorithm in RsaAdjustPrimeCandidate(), which is called before the prime number check. The highest threat from this vulnerability is to data confidentiality.

Record
EUVD-2021-26824
Updated
2026-11-03
GitHub AdvisoriesGHSA-239j-gmhr-4pcm No score

A flaw was found in libtpms in versions before 0.8.0. The TPM 2 implementation returns 2048 bit...

A flaw was found in libtpms in versions before 0.8.0. The TPM 2 implementation returns 2048 bit keys with ~1984 bit strength due to a bug in the TCG specification. The bug is in the key creation algorithm in RsaAdjustPrimeCandidate(), which is called before the prime number check. The highest threat from this vulnerability is to data confidentiality.

Record
GHSA-239j-gmhr-4pcm
Weakness
CWE-331
Updated
2026-11-02
OSV 5.5

A flaw was found in libtpms in versions before 0.8.0. The TPM 2 implementation returns 2048 bit keys with ~1984 bit strength due to a bug in the TCG specification. The bug is in the key creation algorithm in RsaAdjustPrimeCandidate(), which is called before the prime number check. The highest threat from this vulnerability is to data confidentiality.

Record
CVE-2021-3505
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVDEBIAN-CVE-2021-3505 5.5

A flaw was found in libtpms in versions before 0.8.0. The TPM 2 implementation returns 2048 bit keys with ~1984 bit strength due to a bug in the TCG specification. The bug is in the key creation algorithm in RsaAdjustPrimeCandidate(), which is called before the prime number check. The highest threat from this vulnerability is to data confidentiality.

Record
DEBIAN-CVE-2021-3505
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVOESA-2022-1959 5.5

libtpms security update

A library providing TPM functionality for VMs. Targeted for integration into Qemu.

Security Fix(es):

A flaw was found in libtpms in versions before 0.8.0. The TPM 2 implementation returns 2048 bit keys with ~1984 bit strength due to a bug in the TCG specification. The bug is in the key creation algorithm in RsaAdjustPrimeCandidate(), which is called before the prime number check. The highest threat from this vulnerability is to data confidentiality.(CVE-2021-3505)

Record
OESA-2022-1959
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVMGASA-2021-0590 No score

Updated libtpms/swtpm packages fix security vulnerability

CryptSym: fix AES output IV (CVE-2021-3505). Fixed a context save and suspend/resume problem when public keys are loaded. Reset too large size indicators in TPM2B to avoid access beyond buffer (CVE-2021-3623) Restore original value in buffer if unmarshalled one was illegal Fixed out-of-bounds access via specially crafted TPM 2 command packets (CVE-2021-3746) Marshal event sequence objects' hash state

Record
MGASA-2021-0590
Updated
2026-11-02
OSVopenSUSE-SU-2024:11004-1 No score

libtpms-devel-0.8.4-2.2 on GA media

These are all security issues fixed in the libtpms-devel-0.8.4-2.2 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11004-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
libtpms
Debian:12
 before 0.8.0~dev1-1
0.8.0~dev1-1
libtpms
Debian:13
 before 0.8.0~dev1-1
0.8.0~dev1-1
libtpms
Debian:14
 before 0.8.0~dev1-1
0.8.0~dev1-1
libtpms
Mageia:8
From an advisory covering 4 CVEs
 before 0.9.1-1.mga8
0.9.1-1.mga8
swtpm
Mageia:8
From an advisory covering 4 CVEs
 before 0.7.0-5.mga8
0.7.0-5.mga8
libtpms
openEuler:20.03-LTS-SP1
 before 0.7.3-7.oe1
0.7.3-7.oe1

History

History
RecordedChangedSources
affected, facts
aliases, productsEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-3505 is a medium vulnerability (CVSS 5.5) in Libtpms Project Libtpms, published April 19, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.40%, the 34th percentile. Fixed in libtpms 0.8.0~dev1-1.

References

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