Is CVE-2021-3505 in the CISA KEV catalog?

No. CVE-2021-3505 is not currently on the CISA Known Exploited Vulnerabilities list.

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

CVE-2021-3505 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2021-3505?

CVE-2021-3505 has an EPSS score of 0.40% (33th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3505?

Upgrade libtpms on debian 12 to 0.8.0~dev1-1 or later.

CVE & CISA-KEV Catalog

CVE-2021-3505

MEDIUM

5.5

CVSS v3

NVD

Description

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.

CWE-331

How to fix

Remediation Available

libtpmsDebian

Fixed in:0.8.0~dev1-1CVE-2021-3505

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.40%probability of exploitation in 30 days

33rdpercentile

Low risk: more likely to be exploited than 33% of all known CVEs.

References

Patch2

Other references1

lists.fedoraproject.org

Related Vulnerabilities

Other CWE-331 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2008-1447	Medium	6.8	95%	-	Fix
CVE-2018-18326	High	7.5	54%	-	-
CVE-2018-15812	High	7.5	47%	-	-
CVE-2023-38357	Medium	5.3	5.3%	-	Fix
CVE-2015-3405	High	7.5	5.3%	-	Fix
CVE-2008-2108	Critical	9.8	4.3%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.