How severe is CVE-2025-52497?

CVE-2025-52497 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability low.

Is CVE-2025-52497 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-52497?

CVE-2025-52497 affects Arm Mbed Tls. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-52497?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-52497 have an EU (EUVD) identifier?

Yes. CVE-2025-52497 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-20082.

When was CVE-2025-52497 published?

CVE-2025-52497 was published on 2025-07-04 and last updated on 2026-06-17.

CVE-2025-52497

CVE-2025-52497 is a medium-severity vulnerability in Arm Mbed Tls with a CVSS 3.x base score of 4.8. 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-193.

Key facts

Severity: Medium (CVSS 3.x base score 4.8)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-20082
Weakness: CWE-193
Affected product: Arm Mbed Tls
Published: 2025-07-04
Last modified: 2026-06-17

Description

Mbed TLS before 3.6.4 has a PEM parsing one-byte heap-based buffer underflow, in mbedtls_pem_read_buffer and two mbedtls_pk_parse functions, via untrusted PEM input.

Frequently asked questions

What is CVE-2025-52497?: Mbed TLS before 3.6.4 has a PEM parsing one-byte heap-based buffer underflow, in mbedtls_pem_read_buffer and two mbedtls_pk_parse functions, via untrusted PEM input.
How severe is CVE-2025-52497?: CVE-2025-52497 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability low.
Is CVE-2025-52497 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-52497?: CVE-2025-52497 affects Arm Mbed Tls. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-52497?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-52497 have an EU (EUVD) identifier?: Yes. CVE-2025-52497 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-20082.
When was CVE-2025-52497 published?: CVE-2025-52497 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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