What is the CVSS score of CVE-2021-3505?

CVE-2021-3505 has a CVSS 3.1 base score of 5.5 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.4%.

Is there a public PoC exploit available for CVE-2021-3505?

Yes, a public proof-of-concept exploit is available for CVE-2021-3505. Prioritise patching immediately. EPSS: 0.4%.

Is there a patch available for CVE-2021-3505?

Yes, a patch is available for CVE-2021-3505. Update the affected software to the latest version immediately.

Libtpms CVE-2021-3505

MEDIUM

Insufficient Entropy (CWE-331)

2021-04-19 secalert@redhat.com

Information Disclosure Libtpms Enterprise Linux Fedora

5.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.5 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

CVE Published

Apr 19, 2021 - 21:15 nvd

MEDIUM 5.5

DescriptionNVD

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.

AnalysisAI

A flaw was found in libtpms in versions before 0.8.0. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. Public exploit code available.

Technical ContextAI

This vulnerability is classified under CWE-331. 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. Affected products include: Libtpms Project Libtpms, Redhat Enterprise Linux, Fedoraproject Fedora. Version information: before 0.8.0..

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.