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CVE-2025-52496

Arm Mbed Tls vulnerability

7.8 HIGHPublic exploitEPSS 0.21%
  1. Published4 Jul 2025

Description

Mbed TLS before 3.6.4 has a race condition in AESNI detection if certain compiler optimizations occur. An attacker may be able to extract an AES key from a multithreaded program, or perform a GCM forgery.

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

Affected products

Arm Mbed Tls< 3.6.4

Remediation

Fixed in
Arm Mbed Tls≥ 3.6.4

References

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Frequently asked

Is CVE-2025-52496 being actively exploited?

CVE-2025-52496 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.21%.

How severe is CVE-2025-52496?

CVE-2025-52496 has a CVSS 3.1 base score of 7.8, rated high. EPSS estimates a 0.21% probability of exploitation.

Which products are affected by CVE-2025-52496?

Affected products include Arm Mbed Tls.

How do I fix CVE-2025-52496?

Upgrade affected software to a fixed version, for example Arm Mbed Tls 3.6.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-52496 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.