What is CVE-2025-52497?

CVE-2025-52497 is a medium-severity vulnerability in Mbed Mbedtls, classified under Off-by-one Error. CVSS score: 4.8/10. Published 2025-07-04.

How severe is CVE-2025-52497?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Is CVE-2025-52497 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Mbed Mbedtls

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.

EPSS: 0.004 (58.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L.

Affected products

Mbed Mbedtls — versions 0

Weakness classification (CWE)

CWE-193 — Off-by-one Error

Public proof-of-concept exploits

w4zu/Debian_

References

github.com/Mbed-TLS/mbedtls-docs/blob/main/security-advisories/mbedtls-security…

Frequently asked questions

What is CVE-2025-52497?: CVE-2025-52497 is a medium-severity vulnerability in Mbed Mbedtls, classified under Off-by-one Error. CVSS score: 4.8/10. Published 2025-07-04.
How severe is CVE-2025-52497?: Medium severity. CVSS v3 base score is 4.8 out of 10.
Is CVE-2025-52497 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.