CVE Alert: CVE-2025-47917

Vulnerability Summary: CVE-2025-47917

Mbed TLS before 3.6.4 allows a use-after-free in certain situations of applications that are developed in accordance with the documentation. The function mbedtls_x509_string_to_names() takes a head argument that is documented as an output argument. The documentation does not suggest that the function will free that pointer; however, the function does call mbedtls_asn1_free_named_data_list() on that argument, which performs a deep free(). As a result, application code that uses this function (relying only on documented behavior) is likely to still hold pointers to the memory blocks that were freed, resulting in a high risk of use-after-free or double-free. In particular, the two sample programs x509/cert_write and x509/cert_req are affected (use-after-free if the san string contains more than one DN).

Affected Endpoints:

No affected endpoints listed.

Published Date:

7/20/2025, 7:15:23 PM

🔥 CVSS Score:

Exploit Status:

Not Exploited

References:

• https://github.com/Mbed-TLS/mbedtls-docs/blob/main/security-advisories/mbedtls-security-advisory-2025-06-7.md
• https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/

Recommended Action:

No proposed action available. Please refer to vendor documentation for updates.

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