JLSEC-2025-204 Medium 5.3

An issue was discovered in Arm Mbed TLS before 2.23.0

JLSEC Published: Nov 21, 2025
Modified: Jul 17, 2026
Severity: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Affected Packages: MbedTLS_jll < 2.16.8+0
Upstream: CVE-2020-36421

An issue was discovered in Arm Mbed TLS before 2.23.0. Because of a side channel in modular exponentiation, an RSA private key used in a secure enclave could be disclosed.

References

https://bugs.gentoo.org/730752
https://github.com/ARMmbed/mbedtls/issues/3394
https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.7
https://github.com/ARMmbed/mbedtls/releases/tag/v2.23.0
https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html