CVE-2025-59438

MEDIUM

Published Oct 21, 2025 Modified Oct 23, 2025 CWE-208

Description

Mbed TLS through 3.6.4 has an Observable Timing Discrepancy.

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CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Weakness Type (CWE)

CWE-208 CWE-208

Affected Products

Vendor	Product	Versions
arm	mbed_tls	< 3.6.5

References

Advisories & Patches

https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2025-10-invalid-padding-error/ https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/

Frequently Asked Questions

What is CVE-2025-59438? +

Mbed TLS through 3.6.4 has an Observable Timing Discrepancy. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2025-59438? +

CVE-2025-59438 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-59438? +

CVE-2025-59438 affects products from arm, specifically: mbed_tls. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-59438? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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