CVE-2025-479178.9HighCWE-416

CVE-2025-47917: mbedtls vulnerability

Mbed · mbedtls

Fixed in 3.6.4 · Affected: mbedtls before 3.6.4 · Exploitation: possible (1 to 10%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

2.4%probability of exploitation in the next 30 days

84th percentile

050100

Higher than 84% of scored CVEs

8.9HighCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

Mbed TLS before 3.6.4 allows a use-after-free in certain situations of applications that are developed in accordance with the documentation. The function mbedtls_x509_string_to_names() takes a head argument that is documented as an output argument. The documentation does not suggest that the function will free that pointer; however, the function does call mbedtls_asn1_free_named_data_list() on that argument, which performs a deep free(). As a result, application code that uses this function (relying only on documented behavior) is likely to still hold pointers to the memory blocks that were freed, resulting in a high risk of use-after-free or double-free. In particular, the two sample programs x509/cert_write and x509/cert_req are affected (use-after-free if the san string contains more than one DN).

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

Mbed · mbedtlsbefore 3.6.4

On the Atlas

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Exploitation: Possible (1 to 10%). EPSS between 1% and 10%.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Use After Free · Memory Corruption
Vendor: Mbed
Published: July 2025
Band: Possible (1 to 10%), July 2025

CoverageNo articles yet

No CyberSIXT article names CVE-2025-47917 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.