CVE-2025-66442
MEDIUMCVSS 5.1/10EPSS 0.27%
Last modified
CVE-2025-66442 is a medium-severity vulnerability rated 5.1/10 on the CVSS scale. 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.. EPSS estimates a 0.27% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Arm | Mbed Tls | <= 4.0.0 |
| Arm | Tf-Psa-Crypto | <= 1.0.0 |
References
- https://github.com/Mbed-TLS/TF-PSA-Crypto/releasesRelease Notes
- https://github.com/Mbed-TLS/mbedtls/releasesRelease Notes
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2025-66442?
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.
How severe is CVE-2025-66442?
CVE-2025-66442 has a CVSS score of 5.1/10 (MEDIUM severity). The EPSS model estimates a 0.27% probability of exploitation in the next 30 days.
How do I fix CVE-2025-66442?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
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Are you affected by CVE-2025-66442?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST