Covert Timing Channel in mbed TLS - CVE-2025-54764
Published: October 17, 2025
Vulnerability identifier: #VU117337
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-54764
CWE-ID: CWE-385
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: ARM
Affected software:
mbed TLS
mbed TLS
Detailed vulnerability description
The vulnerability allows a remote attacker to decrypt data.
The vulnerability exists due to side channel in RSA key generation and operations when the following functions are used: mbedtls_rsa_gen_key(), psa_generate_key*(), mbedtls_rsa_complete(), mbedtls_mpi_inv_mod(). An attacker can fully recover the RSA private key.
How to mitigate CVE-2025-54764
Install updates from vendor's website.