Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Arm | Mbed Tls | <= 4.0.0 |
| Arm | Tf-Psa-Crypto | <= 1.0.0 |
Related Weaknesses (CWE)
References
- https://github.com/Mbed-TLS/TF-PSA-Crypto/releasesRelease Notes
- https://github.com/Mbed-TLS/mbedtls/releasesRelease Notes
- https://mbed-tls.readthedocs.io/en/latest/security-advisories/Vendor Advisory
- https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-aVendor Advisory
FAQ
What is CVE-2025-66442?
CVE-2025-66442 is a vulnerability with a CVSS score of 5.1 (MEDIUM). 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 aff...
How severe is CVE-2025-66442?
CVE-2025-66442 has been rated MEDIUM with a CVSS base score of 5.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-66442?
Check the references section above for vendor advisories and patch information. Affected products include: Arm Mbed Tls, Arm Tf-Psa-Crypto.