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    2 vulnerabilities found for Nut/Net TCP/IP Stack by Ethernut / egnite GmbH

    CVE-2026-120596 (GCVE-0-2026-120596)

    Vulnerability from nvd – Published: 2026-11-02 17:04 – Updated: 2026-11-02 17:17
    VLAI
    Title
    CVE-2026-120596
    Summary
    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.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-11-02 17:17 UTC
    CWE
    Assigner
    certcc CNA under the mitre root
    CNA scorecard E 42/100 over 172 records in the last 180 days details
    References
    Impacted products
    Show details on NVD website
    To clipboard 

    {
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              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
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              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
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              "userInteraction": "NONE",
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                "timestamp": "2026-11-02T17:17:32.319063Z",
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        ],
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              {
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                "description": "CWE-835 Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
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                "type": "CWE"
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            ]
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        ],
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
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        },
        {
          "descriptions": [
            {
              "description": "CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer",
              "lang": "en"
            }
          ]
        },
        {
          "descriptions": [
            {
              "description": "CWE-20 Improper Input Validation",
              "lang": "en"
            }
          ]
        }
      ],
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      "references": [
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    CVE-2026-120596 (GCVE-0-2026-120596)

    Vulnerability from cvelistv5 – Published: 2026-11-02 17:04 – Updated: 2026-11-02 17:17
    VLAI
    Title
    CVE-2026-120596
    Summary
    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.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-11-02 17:17 UTC
    CWE
    Assigner
    certcc CNA under the mitre root
    CNA scorecard E 42/100 over 172 records in the last 180 days details
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
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              "userInteraction": "NONE",
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        },
        "title": "CISA ADP Vulnrichment"
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            }
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        {
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            {
              "description": "CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer",
              "lang": "en"
            }
          ]
        },
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            {
              "description": "CWE-20 Improper Input Validation",
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