NCSC-2026-0406

Vulnerability from csaf_ncscnl - Published: 2026-10-08 08:08 - Updated: 2026-10-08 08:08
Summary
Kwetsbaarheden verholpen in Cisco NX-OS Software
Notes
The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions: NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein. NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory. This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings.
Feiten: Cisco heeft meerdere kwetsbaarheden verholpen in Cisco NX-OS Software.
Interpretaties: De kwetsbaarheden betreffen verschillende componenten van Cisco NX-OS Software. - Een kwetsbaarheid in de Python interpreter maakt het mogelijk voor een geauthenticeerde lokale aanvaller met lage privileges om de Python sandbox te ontsnappen en willekeurige commando's op het onderliggende besturingssysteem uit te voeren. - Een andere kwetsbaarheid in de NX-API feature laat ongeauthenticeerde externe aanvallers toe om via onvoldoende inputvalidatie van HTTP-verzoeken willekeurige code met rootrechten uit te voeren of een denial of service te veroorzaken. - Daarnaast kunnen ongeauthenticeerde externe aanvallers door het ontbreken van adequate rate limiting op bepaalde protocollen systeembronnen uitputten, wat leidt tot tijdelijke verstoringen in routing en control plane protocollen. - Verder zijn er meerdere intern ontdekte kwetsbaarheden die betrekking hebben op improper neutralization (CWE-707), improper access control (CWE-284), improper input validation (CWE-20), out-of-bounds read (CWE-125), improper handling of exceptional conditions (CWE-703) en out-of-bounds write (CWE-787). Deze kwetsbaarheden kunnen leiden tot verschillende vormen van ongeautoriseerde toegang, systeeminstabiliteit of verstoring van de werking van het netwerkbesturingssysteem. De kwetsbaarheden zijn geïdentificeerd tijdens interne beveiligingsreviews door het engineeringteam van Cisco en voor zover bekend is geen van de kwetsbaarheden actief misbruikt.
Oplossingen: Cisco heeft software hardening updates uitgebracht voor Cisco NX-OS Software om deze kwetsbaarheden te verhelpen. Zie bijgevoegde referenties voor meer informatie.
Kans: medium
Schade: high
CWE-122: Heap-based Buffer Overflow
CWE-125: Out-of-bounds Read
CWE-653: Improper Isolation or Compartmentalization
CWE-770: Allocation of Resources Without Limits or Throttling
CWE-787: Out-of-bounds Write
CVE-2026-20032

A vulnerability in Cisco NX-OS Software's Python interpreter allows an authenticated local attacker with low privileges to escape the Python sandbox and execute arbitrary commands on the underlying operating system due to insufficient input validation.

4.4 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CWE-653 - Improper Isolation or Compartmentalization
Affected products
Product Identifier Version Remediation
vers:unknown/*
Cisco / Cisco MDS 9000 Multilayer Directors and Fabric Switches
 vers:unknown/*
vers:unknown/*
Cisco / Cisco Nexus 3000 Series Switches
 vers:unknown/*
vers:unknown/*
Cisco / Cisco Nexus 7000 Series Switches
 vers:unknown/*
vers:unknown/*
Cisco / Cisco Nexus 9000 Series Switches
 vers:unknown/*
vers:unknown/*
Cisco / Cisco Unified Computing System (Managed)
 vers:unknown/*
vers:unknown/*
Cisco / NX-OS
 vers:unknown/*
CVE-2026-20173

A vulnerability in Cisco NX-OS Software allows unauthenticated remote attackers to cause denial of service by exhausting system resources through improper rate limiting on certain protocols, disrupting routing and control plane functions.

5.8 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
CWE-770 - Allocation of Resources Without Limits or Throttling
Affected products
Known affected 6 products, the same list as for CVE-2026-20032
CVE-2026-76453

Cisco's NX-OS engineering team conducted an internal security review resulting in software hardening releases that address multiple vulnerabilities related to improper neutralization issues, including CVE-2026-76453.

8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-125 - Out-of-bounds Read
Affected products
Known affected 6 products, the same list as for CVE-2026-20032
CVE-2026-76455

Cisco's NX-OS engineering team conducted an internal security review resulting in software hardening releases that fix multiple vulnerabilities related to improper access control (CVE-2026-76455, CWE-284).

9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-125 - Out-of-bounds Read
Affected products
Known affected 6 products, the same list as for CVE-2026-20032
CVE-2026-76456

Cisco's NX-OS engineering team conducted an internal security review resulting in software hardening releases that fix multiple vulnerabilities related to improper input validation, including CVE-2026-76456 and CWE-20.

8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE-125 - Out-of-bounds Read
Affected products
Known affected 6 products, the same list as for CVE-2026-20032
CVE-2026-76457

Cisco's NX-OS engineering team conducted an internal security review resulting in software hardening releases that fix multiple vulnerabilities, including an out-of-bounds read issue tracked as CVE-2026-76457 and CWE-125.

8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE-125 - Out-of-bounds Read
Affected products
Known affected 6 products, the same list as for CVE-2026-20032
CVE-2026-76458

Cisco's NX-OS engineering team conducted an internal security review resulting in software hardening releases that fix multiple vulnerabilities related to improper handling of exceptional conditions (CVE-2026-76458, CWE-703).

8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE-125 - Out-of-bounds Read
Affected products
Known affected 6 products, the same list as for CVE-2026-20032
CVE-2026-76459

Cisco's NX-OS engineering team conducted an internal security review resulting in software hardening releases that fix multiple vulnerabilities, including out-of-bounds write issues classified under CWE-787 and tracked by CVE-2026-76459.

8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-787 - Out-of-bounds Write
Affected products
Known affected 6 products, the same list as for CVE-2026-20032
CVE-2026-76471

A vulnerability in Cisco NX-OS Software's NX-API feature allows unauthenticated remote attackers to execute arbitrary code with root privileges or cause denial of service via crafted HTTP requests due to insufficient input validation.

9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-122 - Heap-based Buffer Overflow
Affected products
Known affected 6 products, the same list as for CVE-2026-20032
References
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          "text": "Out-of-bounds Read",
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          "text": "Out-of-bounds Write",
          "title": "CWE-787"
        },
        {
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          "title": "Summary"
        }
      ],
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          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6"
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          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6"
          ]
        }
      ],
      "title": "CVE-2026-76456"
    },
    {
      "cve": "CVE-2026-76457",
      "cwe": {
        "id": "CWE-125",
        "name": "Out-of-bounds Read"
      },
      "notes": [
        {
          "category": "other",
          "text": "Out-of-bounds Read",
          "title": "CWE-125"
        },
        {
          "category": "other",
          "text": "Out-of-bounds Write",
          "title": "CWE-787"
        },
        {
          "category": "description",
          "text": "Cisco\u0027s NX-OS engineering team conducted an internal security review resulting in software hardening releases that fix multiple vulnerabilities, including an out-of-bounds read issue tracked as CVE-2026-76457 and CWE-125.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-76457 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-76457.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6"
          ]
        }
      ],
      "title": "CVE-2026-76457"
    },
    {
      "cve": "CVE-2026-76458",
      "cwe": {
        "id": "CWE-125",
        "name": "Out-of-bounds Read"
      },
      "notes": [
        {
          "category": "other",
          "text": "Out-of-bounds Read",
          "title": "CWE-125"
        },
        {
          "category": "other",
          "text": "Out-of-bounds Write",
          "title": "CWE-787"
        },
        {
          "category": "description",
          "text": "Cisco\u0027s NX-OS engineering team conducted an internal security review resulting in software hardening releases that fix multiple vulnerabilities related to improper handling of exceptional conditions (CVE-2026-76458, CWE-703).",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-76458 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-76458.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6"
          ]
        }
      ],
      "title": "CVE-2026-76458"
    },
    {
      "cve": "CVE-2026-76459",
      "cwe": {
        "id": "CWE-787",
        "name": "Out-of-bounds Write"
      },
      "notes": [
        {
          "category": "other",
          "text": "Out-of-bounds Write",
          "title": "CWE-787"
        },
        {
          "category": "other",
          "text": "Out-of-bounds Read",
          "title": "CWE-125"
        },
        {
          "category": "description",
          "text": "Cisco\u0027s NX-OS engineering team conducted an internal security review resulting in software hardening releases that fix multiple vulnerabilities, including out-of-bounds write issues classified under CWE-787 and tracked by CVE-2026-76459.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-76459 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-76459.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6"
          ]
        }
      ],
      "title": "CVE-2026-76459"
    },
    {
      "cve": "CVE-2026-76471",
      "cwe": {
        "id": "CWE-122",
        "name": "Heap-based Buffer Overflow"
      },
      "notes": [
        {
          "category": "other",
          "text": "Heap-based Buffer Overflow",
          "title": "CWE-122"
        },
        {
          "category": "description",
          "text": "A vulnerability in Cisco NX-OS Software\u0027s NX-API feature allows unauthenticated remote attackers to execute arbitrary code with root privileges or cause denial of service via crafted HTTP requests due to insufficient input validation.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-76471 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-76471.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6"
          ]
        }
      ],
      "title": "CVE-2026-76471"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.