CVE-2025-66442
MEDIUM
5.1
CVSS Score
Published: April 1, 2026 at 12:00 AM UTC
Updated: June 17, 2026 at 09:56 AM UTC
4 products affected across 2 vendorsmbed TLSTf Psa CryptoMbedtls
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Severity
MEDIUM5.1
Exploit prediction
EPSS 0.3%
SSVC
No known exploit
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v ≤ 1.0.0
v ≤ 4.0.0
v ≤ 1.0.0
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (4)
SSVC — Action Prioritization
SSVCNo known exploitNot automatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
5.1MEDIUMCISA-ADP
- Attack Vector
- LOCAL
- Complexity
- HIGH
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- NONE
- Availability
- NONE
Vector?
Quick Info
StatusANALYZED
CWE
CWE-385
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