CVE-2025-66442

MEDIUM EPSS 18.6%
Published Apr 1, 20262mo ago · Modified Jun 17, 20261w ago
5.1 CVSS 3.1
Medium
Find Similar
Published Apr 1, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
5.1
Exploitability
1.4
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector Local
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability None

Threat Intelligence

EPSS Exploit Probability
18.6% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-385

Affected Products 2

VendorProductVersionRange
armmbed_tls* ≤4.0.0
armtf-psa-crypto* ≤1.0.0

References 4

  • github.com https://github.com/Mbed-TLS/TF-PSA-Crypto/releases
    Release Notes
  • github.com https://github.com/Mbed-TLS/mbedtls/releases
    Release Notes
  • mbed-tls.readthedocs.io https://mbed-tls.readthedocs.io/en/latest/security-advisories/
    Vendor Advisory
  • mbed-tls.readthedocs.io https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-compiler-induced-constant-time-violations/
    Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.