CVE-2025-47917
mbedtls - security update
Description
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).
How to fix CVE-2025-47917
To remediate CVE-2025-47917, upgrade the affected package to a fixed version below.
- —upgrade to 3.6.4-r0 or later
- —upgrade to 2.16.9-0.1+deb11u3 or later
- —upgrade to 2.16.9-0.1+deb11u2 or later
- —upgrade to 2.16.9-0.1+deb11u3 or later
Is CVE-2025-47917 being exploited?
Moderate — EPSS is 8.4%. Track this CVE but it's not at the top of the prioritisation list.
Affected packages (4)
- from 0, < 3.6.4-r0
- from 0, < 2.16.9-0.1+deb11u3
- from 0, < 2.16.9-0.1+deb11u2
- from 0, < 2.16.9-0.1+deb11u3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |