What’s Vulnerable › Vulnerabilities

CVE-2025-54764

• Severity: medium (CVSS 6.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-10-20 · updated 2026-06-17
• Weakness: CWE-208

Description

Mbed TLS before 3.6.5 allows a local timing attack against certain RSA operations, and direct calls to mbedtls_mpi_mod_inv or mbedtls_mpi_gcd.

Affected products

• mbedtls: before 3.6.5 — fixed in 3.6.5

How to fix

Upgrade to a fixed version: mbedtls 3.6.5. Check the vendor advisory for mitigations.

References

• https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2025-10-ssbleed-mstep/
• https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/

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