CVE-2025-49600
4.9 · MEDIUMOverview
CVE-2025-49600 is a medium-severity vulnerability affecting trustedfirmware mbed_tls. It was published on July 4, 2025 and has a CVSS 3.1 base score of 4.9 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 4.9, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
Technical Description
In MbedTLS 3.3.0 before 3.6.4, mbedtls_lms_verify may accept invalid signatures if hash computation fails and internal errors go unchecked, enabling LMS (Leighton-Micali Signature) forgery in a fault scenario. Specifically, unchecked return values in mbedtls_lms_verify allow an attacker (who can induce a hardware hash accelerator fault) to bypass LMS signature verification by reusing stale stack data, resulting in acceptance of an invalid signature. In mbedtls_lms_verify, the return values of the internal Merkle tree functions create_merkle_leaf_value and create_merkle_internal_value are not checked. These functions return an integer that indicates whether the call succeeded or not. If a failure occurs, the output buffer (Tc_candidate_root_node) may remain uninitialized, and the result of the signature verification is unpredictable. When the software implementation of SHA-256 is used, these functions will not fail. However, with hardware-accelerated hashing, an attacker could use fault
Remediation
Check the references section for vendor advisories and patches from trustedfirmware. 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 |
|---|---|---|---|
| trustedfirmware | mbed_tls | >= 3.3.0, < 3.6.4 | Affected |
Frequently Asked Questions
What is CVE-2025-49600?
CVE-2025-49600 is a medium-severity vulnerability affecting trustedfirmware mbed_tls. It was published on July 4, 2025 and has a CVSS 3.1 base score of 4.9 (MEDIUM).
How severe is CVE-2025-49600?
This vulnerability has a CVSS 3.1 base score of 4.9, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2025-49600?
Check the references section for vendor advisories and patches from trustedfirmware. 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-2025-49600?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-49600 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
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