{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-120596",
        "assignerOrgId": "37e5125f-f79b-445b-8fad-9564f167944b",
        "state": "PUBLISHED",
        "assignerShortName": "certcc",
        "dateReserved": "2026-11-02T16:58:49.331Z",
        "datePublished": "2026-11-02T17:04:18.611Z",
        "dateUpdated": "2026-11-02T17:17:35.066Z"
    },
    "containers": {
        "cna": {
            "title": "CVE-2026-120596",
            "descriptions": [
                {
                    "lang": "en",
                    "value": "A remotely exploitable denial-of-service vulnerability exists in the TCP options parser of the Nut/Net TCP/IP stack included in Nut/OS, developed by Ethernut/Egnite. Nut/OS releases up to version 5.1 are affected. An unauthenticated attacker can send a single TCP segment containing an unknown TCP option with a length byte of zero to any open TCP port on a vulnerable device. When processed, this malformed option triggers an infinite loop in the function NutTcpInputOptions, permanently blocking the TCP processing thread and rendering all TCP-based services unresponsive until the device is rebooted."
                }
            ],
            "source": {
                "discovery": "UNKNOWN"
            },
            "affected": [
                {
                    "vendor": "Ethernut / egnite GmbH",
                    "product": "Nut/Net TCP/IP Stack",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "Nut/OS 5.1"
                        }
                    ]
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "description": "CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "description": "CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "description": "CWE-20 Improper Input Validation"
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://www.ethernut.de/en/download/index.html"
                }
            ],
            "x_generator": {
                "engine": "VINCE 3.0.52",
                "env": "prod",
                "origin": "https://cveawg.mitre.org/api/cve/CVE-2026-120596"
            },
            "providerMetadata": {
                "orgId": "37e5125f-f79b-445b-8fad-9564f167944b",
                "shortName": "certcc",
                "dateUpdated": "2026-11-02T17:04:18.611Z"
            }
        },
        "adp": [
            {
                "problemTypes": [
                    {
                        "descriptions": [
                            {
                                "type": "CWE",
                                "cweId": "CWE-835",
                                "lang": "en",
                                "description": "CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')"
                            }
                        ]
                    }
                ],
                "metrics": [
                    {
                        "cvssV3_1": {
                            "scope": "UNCHANGED",
                            "version": "3.1",
                            "baseScore": 7.5,
                            "attackVector": "NETWORK",
                            "baseSeverity": "HIGH",
                            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                            "integrityImpact": "NONE",
                            "userInteraction": "NONE",
                            "attackComplexity": "LOW",
                            "availabilityImpact": "HIGH",
                            "privilegesRequired": "NONE",
                            "confidentialityImpact": "NONE"
                        }
                    },
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-11-02T17:17:32.319063Z",
                                "id": "CVE-2026-120596",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-11-02T17:17:35.066Z"
                }
            }
        ]
    }
}