Timing Attack Affecting armmbed/mbedtls package, versions [,3.6.5)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-ARMMBEDMBEDTLS-13645028
- published21 Oct 2025
- disclosed20 Oct 2025
- creditChang Liu, Trevor E. Carlson, Cristiano Rodrigues, Marton Bognar, Sandro Pinto, Jo Van Bulck
Introduced: 20 Oct 2025
NewCVE-2025-54764 (opens in a new tab)How to fix?
Upgrade armmbed/mbedtls to version 3.6.5 or higher.
Overview
Affected versions of this package are vulnerable to Timing Attack via the mbedtls_mpi_mod_inv or mbedtls_mpi_gcd functions. An attacker can recover sensitive information from RSA operations by performing a local timing analysis.
Note: Applications that do not use RSA private keys and do not directly call mbedtls_mpi_inv_mod() or mbedtls_mpi_gcd() are not affected.
Workaround
Applications that do not generate RSA keys and do not import private RSA keys with mbedtls_rsa_import()+mbedtls_rsa_complete(), but use other RSA functions that are only vulnerable with MBEDTLS_RSA_NO_CRT, can recompile without MBEDTLS_RSA_NO_CRT.