Is CVE-2025-66442 actively exploited?

CVE-2025-66442 has no public evidence of in-the-wild exploitation as of 2026-04-03.

What is the CVSS score for CVE-2025-66442?

CVE-2025-66442 has a CVSS score of 5.1 (MEDIUM severity). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

How do I patch CVE-2025-66442?

Patch guidance is available from arm security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2025-66442.

Which products are affected by CVE-2025-66442?

2 products: arm mbed tls, arm tf-psa-crypto.

CVE-2025-66442 - remediation guidance & executive summary

Description

In 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.

CVSS Metrics

Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector: local
Complexity: high
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: none
Availability: none
Weaknesses: CWE-385

Metadata

Primary Vendor: ARM
Published: 4/1/2026
Last Modified: 4/3/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2025-66442

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary