How severe is CVE-2025-52496?

CVE-2025-52496 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2025-52496 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-52496?

CVE-2025-52496 affects Arm Mbed Tls. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-52496?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-52496 have an EU (EUVD) identifier?

Yes. CVE-2025-52496 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-20081.

When was CVE-2025-52496 published?

CVE-2025-52496 was published on 2025-07-04 and last updated on 2026-06-17.

CVE-2025-52496

CVE-2025-52496 is a high-severity vulnerability in Arm Mbed Tls with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-733.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-20081
Weakness: CWE-733
Affected product: Arm Mbed Tls
Published: 2025-07-04
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-52496?: 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.
How severe is CVE-2025-52496?: CVE-2025-52496 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2025-52496 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-52496?: CVE-2025-52496 affects Arm Mbed Tls. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-52496?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-52496 have an EU (EUVD) identifier?: Yes. CVE-2025-52496 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-20081.
When was CVE-2025-52496 published?: CVE-2025-52496 was published on 2025-07-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*

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