CVE-2025-66442

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Summary

CVECVE-2025-66442
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-01 20:16:22 UTC
Updated2026-04-03 20:04:38 UTC
DescriptionIn Mbed TLS through 4.0.0, there is a compiler-induced timing side channel (in RSA and CBC/ECB decryption) that only occurs with LLVM's select-optimize feature. TF-PSA-Crypto through 1.0.0 is also affected.

Risk And Classification

Primary CVSS: v3.1 5.1 MEDIUM from ADP

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

EPSS: 0.000210000 probability, percentile 0.057420000 (date 2026-04-07)

Problem Types: CWE-385 | n/a | CWE-385 CWE-385 Covert Timing Channel

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED5.1MEDIUMCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary5.1MEDIUMCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Arm Mbed Tls All All All All
Application Arm Tf-psa-crypto All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
mbed-tls.readthedocs.io/en/latest/security-advisories [email protected] mbed-tls.readthedocs.io Vendor Advisory
github.com/Mbed-TLS/TF-PSA-Crypto/releases [email protected] github.com Release Notes
github.com/Mbed-TLS/mbedtls/releases [email protected] github.com Release Notes
mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-... [email protected] mbed-tls.readthedocs.io Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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