CVE-2025-47917
8.9 · HIGHOverview
CVE-2025-47917 is a high-severity vulnerability affecting arm mbed_tls. It was published on July 20, 2025 and has a CVSS 3.1 base score of 8.9 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.9, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
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).
Remediation
Check the references section for vendor advisories and patches from arm. Update mbed_tls to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| arm | mbed_tls | >= 0, < 3.6.4 | Affected |
References
Frequently Asked Questions
What is CVE-2025-47917?
CVE-2025-47917 is a high-severity vulnerability affecting arm mbed_tls. It was published on July 20, 2025 and has a CVSS 3.1 base score of 8.9 (HIGH).
How severe is CVE-2025-47917?
This vulnerability has a CVSS 3.1 base score of 8.9, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2025-47917?
Check the references section for vendor advisories and patches from arm. Update mbed_tls to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-47917?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-47917 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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