MEDIUM
CVE-2025-66442
CWE-385Published: April 1, 2026· Updated: Apr 3, 2026
5.1
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:2.2th
Official 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.
Technical Analysis
CVE-2025-66442 requires local access, meaning attackers must already have a foothold on the target system.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 5.1.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorLocal
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected Vendors & Products
arm2 products
mbed tlstf-psa-crypto
Source: NVD CPE · 2 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (4)
→
https://github.com/Mbed-TLS/TF-PSA-Crypto/releasesRelease Notes
→
https://github.com/Mbed-TLS/mbedtls/releasesRelease Notes
→
Quick Facts
CVE IDCVE-2025-66442
CVSS Score5.1 / 10
SeverityMEDIUM
WeaknessCWE-385
CISA KEVNo
EPSS (30d)0.01%
Affected1 vendor
PublishedApr 1, 2026
Related CVEs (CWE-385)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2025-66442 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.