NCSC-2026-0338

Vulnerability from csaf_ncscnl - Published: 2026-09-03 13:09 - Updated: 2026-09-03 13:09
Summary
Kwetsbaarheden verholpen in Cisco Nexus 9000 Series, IOS XR Software en Secure Email
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 kwetsbaarheden verholpen in Cisco Nexus 9000 Series Switches met Silicon One technologie, Cisco IOS XR Software en Cisco Secure Email.
Interpretaties: De ernstigste kwetsbaarheid betreft Nexus 9000-switches: als TCP 43210 of 43211 bereikbaar is, kan een aanvaller zonder authenticatie code met rootrechten uitvoeren en de switch laten herstarten. De IOS XR-kwetsbaarheden kunnen, afhankelijk van platform en configuratie, diverse beveiligingsfuncties ondermijnen. De Secure Email-kwetsbaarheden kunnen alleen bij een man-in-the-middlepositie en S/MIME-gebruik leiden tot het ontsleutelen van e-mail en het aanpassen van verkeer tussen e-mail gateways.
Oplossingen: Cisco heeft updates uitgebracht voor Cisco Nexus 9000 Series Switches, IOS XR Software en Secure Email om de kwetsbaarheden te verhelpen. Zie bijgevoegde referenties voor meer informatie.
Kans: medium
Schade: high
CWE-354: Improper Validation of Integrity Check Value
CWE-1327: Binding to an Unrestricted IP Address
CVE-2026-20212

A vulnerability in Cisco Nexus 9000 Series Switches' Silicon One integration allows unauthenticated remote attackers to execute root-level code via accessible TCP ports 43210 and 43211, potentially causing device crashes and reloads.

9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-1327 - Binding to an Unrestricted IP Address
Affected products
Product Identifier Version Remediation
vers:unknown/*
Cisco / AsyncOS
 vers:unknown/*
vers:unknown/*
Cisco / Cisco IOS XR
 vers:unknown/*
vers:unknown/*
Cisco / Cisco IOS XR Software
 vers:unknown/*
vers:unknown/*
Cisco / Cisco NX-OS Software
 vers:unknown/*
vers:unknown/*
Cisco / Cisco Nexus 9000 Series Switches
 vers:unknown/*
vers:unknown/*
Cisco / Cisco Secure Email
 vers:unknown/*
vers:unknown/*
Cisco / Nexus
 vers:unknown/*
vers:unknown/*
Cisco / Secure Email Gateway
 vers:unknown/*
CVE-2026-20274

Cisco's IOS XR Software team conducted an internal security review resulting in software hardening releases that address multiple vulnerabilities, including improper resource control (CVE-2026-20274, CWE-664).

9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
Known affected 8 products, the same list as for CVE-2026-20212
CVE-2026-20275

Cisco's IOS XR Software team conducted an internal security review resulting in software hardening releases that fix multiple vulnerabilities, including incorrect calculation issues classified under CWE-682 and tracked by CVE-2026-20275.

8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
Known affected 8 products, the same list as for CVE-2026-20212
CVE-2026-20276

Cisco's IOS XR Software team conducted an internal security review resulting in software hardening releases that address multiple vulnerabilities related to insufficient control flow management (CVE-2026-20276, CWE-691).

8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Affected products
Known affected 8 products, the same list as for CVE-2026-20212
CVE-2026-20277

Cisco's IOS XR Software team conducted an internal security review resulting in software hardening releases that fix multiple vulnerabilities related to protection mechanism failures, including those classified under CWE-693 and tracked by CVE-2026-20277.

8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Affected products
Known affected 8 products, the same list as for CVE-2026-20212
CVE-2026-20278

Cisco's IOS XR Software team conducted an internal security review resulting in software hardening releases that address multiple vulnerabilities related to improper neutralization issues, including those classified under CWE-707 and tracked by CVE-2026-20278.

8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
Known affected 8 products, the same list as for CVE-2026-20212
CVE-2026-20279

Cisco's IOS XR Software team conducted an internal security review resulting in software hardening releases that address multiple vulnerabilities related to improper access control (CVE-2026-20279, CWE-284).

9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
Known affected 8 products, the same list as for CVE-2026-20212
CVE-2026-20280

Cisco's IOS XR Software team conducted an internal security review resulting in software hardening releases that address multiple vulnerabilities, including improper handling of exceptional conditions (CVE-2026-20280, CWE-703).

8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
Known affected 8 products, the same list as for CVE-2026-20212
CVE-2026-20354

Multiple vulnerabilities in Cisco Secure Email's S/MIME decryption allow unauthenticated remote attackers to recover plaintext from encrypted emails by exploiting insufficient message integrity validation via man-in-the-middle attacks.

5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE-354 - Improper Validation of Integrity Check Value
Affected products
Known affected 8 products, the same list as for CVE-2026-20212
CVE-2026-20355

Multiple vulnerabilities in Cisco Secure Email's S/MIME decryption allow unauthenticated remote attackers to recover plaintext from encrypted emails by exploiting insufficient message integrity validation via man-in-the-middle attacks.

5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE-354 - Improper Validation of Integrity Check Value
Affected products
Known affected 8 products, the same list as for CVE-2026-20212
References
To clipboard 

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        {
          "category": "description",
          "text": "Cisco\u0027s IOS XR Software team conducted an internal security review resulting in software hardening releases that fix multiple vulnerabilities related to protection mechanism failures, including those classified under CWE-693 and tracked by CVE-2026-20277.",
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        }
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            "CSAFPID-7",
            "CSAFPID-8"
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          "title": "Summary"
        }
      ],
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          "CSAFPID-2",
          "CSAFPID-3",
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          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8"
        ]
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            "CSAFPID-6",
            "CSAFPID-7",
            "CSAFPID-8"
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          "text": "Cisco\u0027s IOS XR Software team conducted an internal security review resulting in software hardening releases that address multiple vulnerabilities related to improper access control (CVE-2026-20279, CWE-284).",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20279 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20279.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",
            "CSAFPID-7",
            "CSAFPID-8"
          ]
        }
      ],
      "title": "CVE-2026-20279"
    },
    {
      "cve": "CVE-2026-20280",
      "notes": [
        {
          "category": "description",
          "text": "Cisco\u0027s IOS XR Software team conducted an internal security review resulting in software hardening releases that address multiple vulnerabilities, including improper handling of exceptional conditions (CVE-2026-20280, CWE-703).",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20280 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20280.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",
            "CSAFPID-7",
            "CSAFPID-8"
          ]
        }
      ],
      "title": "CVE-2026-20280"
    },
    {
      "cve": "CVE-2026-20354",
      "cwe": {
        "id": "CWE-354",
        "name": "Improper Validation of Integrity Check Value"
      },
      "notes": [
        {
          "category": "other",
          "text": "Improper Validation of Integrity Check Value",
          "title": "CWE-354"
        },
        {
          "category": "description",
          "text": "Multiple vulnerabilities in Cisco Secure Email\u0027s S/MIME decryption allow unauthenticated remote attackers to recover plaintext from encrypted emails by exploiting insufficient message integrity validation via man-in-the-middle attacks.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20354 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20354.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6",
            "CSAFPID-7",
            "CSAFPID-8"
          ]
        }
      ],
      "title": "CVE-2026-20354"
    },
    {
      "cve": "CVE-2026-20355",
      "cwe": {
        "id": "CWE-354",
        "name": "Improper Validation of Integrity Check Value"
      },
      "notes": [
        {
          "category": "other",
          "text": "Improper Validation of Integrity Check Value",
          "title": "CWE-354"
        },
        {
          "category": "description",
          "text": "Multiple vulnerabilities in Cisco Secure Email\u0027s S/MIME decryption allow unauthenticated remote attackers to recover plaintext from encrypted emails by exploiting insufficient message integrity validation via man-in-the-middle attacks.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20355 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20355.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6",
            "CSAFPID-7",
            "CSAFPID-8"
          ]
        }
      ],
      "title": "CVE-2026-20355"
    }
  ]
}



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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.