ESF-IDF: Out-of-bounds Read in lwIP DHCP Server Option Parser_CVE-2026-45160

{
    "lastseen": "",
    "description": "ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.2.7, 5.3.5, 5.4.4, 5.5.4, and 6.0.1, an out-of-bounds read flaw exists in the DHCP server option parser (parse_options() in components/lwip/apps/dhcpserver/dhcpserver.c) shipped with ESP-IDF's lwIP component. The parser walks the BOOTP/DHCP options field without validating that each option's length byte and declared payload length stay within the received packet buffer. A crafted DHCP request can cause the parser to read past the end of the options buffer into adjacent heap memory. The issue affects the DHCP server used by ESP-IDF's SoftAP and any configuration where the device runs as a DHCP server on a local network. This issue has been patched in versions 5.2.8, 5.3.6, 5.4.5, 5.5.5, and 6.0.2.",
    "published": "2026-06-10T00:26:34.381Z",
    "modified": "2026-06-10T00:26:34.381Z",
    "type": "cve",
    "title": "ESF-IDF: Out-of-bounds Read in lwIP DHCP Server Option Parser",
    "source": "GitHub_M",
    "references": "https://github.com/espressif/esp-idf/security/advisories/GHSA-g764-gwc3-75m5\nhttps://github.com/espressif/esp-idf/commit/2bf4dd12002dbae60a4b21abff010ecb2b8ee82b\nhttps://github.com/espressif/esp-idf/commit/2da2db43fd7e0bcff9e7b95f54f388296bb6f911\nhttps://github.com/espressif/esp-idf/commit/8b4b5d5301815198d177974ffc24848f47748248\nhttps://github.com/espressif/esp-idf/commit/9f713dbc94982d917f2d12964b233cd9efa4aeba\nhttps://github.com/espressif/esp-idf/commit/d51b1076092487e533eadf8b48c9c8579d3a6712\nhttps://github.com/espressif/esp-idf/commit/fba5f995436a3e3139f768b6d8f1a74d5ce1d318",
    "id": "CVE-2026-45160",
    "bulletinFamily": "",
    "cwe": [
        "CWE-125"
    ],
    "cvelist": null,
    "sourceData": "espressif esp-idf = 5.2.7\nespressif esp-idf = 5.3.5\nespressif esp-idf = 5.4.4\nespressif esp-idf = 5.5.4\nespressif esp-idf = 6.0.1",
    "sourceHref": "",
    "cvss": {
        "score": 6.5,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "esp-idf",
    "version": "= 5.2.7",
    "vendor": "espressif",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}