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An issue was discovered in Mbed TLS before 2.28.2 and 3.x before 3.3.0. An adversary with access to precise enough information about memory accesses (typically an untrusted operating system attacking a secure enclave) can recover an RSA private key after observing the victim performing a single private-key operation if the window size (MBEDTLS_MPI_WINDOW_SIZE) used for the exponentiation is 3 or smaller.

🗓️ 17 Jan 2023 08:00:00Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 5 Views

Mbed TLS older versions flaw lets RSA key be recovered after one operation if window size ≤3 and memory access is observed.

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18 Feb 2026 10:50Current
5.4Medium risk
Vulners AI Score5.4
CVSS 3.15.3
EPSS0.00787
SSVC
5