Integer Underflow in ICMP Echo Reply Processing in FreeRTOS-Plus-TCP_CVE-2026-7423

{
    "lastseen": "",
    "description": "Integer underflow in the ICMP and ICMPv6 echo reply handlers in FreeRTOS-Plus-TCP before V4.4.1 and V4.2.6 allows an adjacent network user to cause a denial of service (device crash) when outgoing ping support is enabled, because header sizes are subtracted from a packet length field without validating the field is large enough, resulting in a heap out-of-bounds read of up to approximately 65KB.\n\n\n\nTo mitigate this issue, users should upgrade to the fixed version when available.",
    "published": "2026-04-29T18:36:28.353Z",
    "modified": "2026-04-29T19:08:11.602Z",
    "type": "cve",
    "title": "Integer Underflow in ICMP Echo Reply Processing in FreeRTOS-Plus-TCP",
    "source": "AMZN",
    "references": "https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1\nhttps://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6\nhttps://aws.amazon.com/security/security-bulletins/2026-021-aws/\nhttps://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-7r59-2pgv-9v2r",
    "id": "CVE-2026-7423",
    "bulletinFamily": "",
    "cwe": [
        "CWE-191"
    ],
    "cvelist": null,
    "sourceData": "AWS FreeRTOS-Plus-TCP 4.0.0\nAWS FreeRTOS-Plus-TCP 4.3.0",
    "sourceHref": "",
    "cvss": {
        "score": 5.3,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:A/AC:H/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": "FreeRTOS-Plus-TCP",
    "version": "4.0.0",
    "vendor": "AWS",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}