Is CVE-2026-21444 in the CISA KEV catalog?

No. CVE-2026-21444 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-21444?

CVE-2026-21444 has a CVSS v3 base score of 5.5 (Moderate).

What is the EPSS score for CVE-2026-21444?

CVE-2026-21444 has an EPSS score of 0.07% (0th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-21444?

Upgrade libtpms on debian unstable to 0.10.2-1 or later.

CVE & CISA-KEV Catalog

CVE-2026-21444

MEDIUM

5.5

CVSS v3

NVD

Description

libtpms, a library that provides software emulation of a Trusted Platform Module, has a flaw in versions 0.10.0 and 0.10.1. The commonly used integration of libtpms with OpenSSL 3.x contained a vulnerability related to the returned IV (initialization vector) when certain symmetric ciphers were used. Instead of returning the last IV it returned the initial IV to the caller, thus weakening the subsequent encryption and decryption steps. The highest threat from this vulnerability is to data confidentiality. Version 0.10.2 fixes the issue. No known workarounds are available.

CWE-327 CWE-330

How to fix

Remediation Available

libtpmsDebian

Fixed in:0.10.2-1CVE-2026-21444

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

0.07%probability of exploitation in 30 days

0thpercentile

Low risk: more likely to be exploited than 0% of all known CVEs.

References

Patch2

Exploit1

github.com

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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 2026-02-25.