{
    "id": "CVE-2025-47917",
    "published": "2025-07-20 19:15:23",
    "last_modified": "2026-06-17 09:28:50",
    "cvss_score": "8.9",
    "cvss_severity": "HIGH",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:H",
    "cwe": "CWE-416",
    "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).",
    "epss_score": "0.02275",
    "epss_percentile": "0.82646",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-10-13 18:17:50",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "arm",
            "product": "mbed_tls"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "52427",
            "title": "Mbed TLS 3.6.4 - Use-After-Free",
            "date": "2025-09-16",
            "url": "https://www.exploit-db.com/exploits/52427"
        }
    ],
    "refs_list": [
        "https://github.com/Mbed-TLS/mbedtls-docs/blob/main/security-advisories/mbedtls-security-advisory-2025-06-7.md",
        "https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/",
        "https://lists.debian.org/debian-lts-announce/2025/08/msg00013.html",
        "https://lists.debian.org/debian-lts-announce/2025/08/msg00025.html"
    ]
}