NCSC-2026-0071

Vulnerability from csaf_ncscnl - Published: 2026-02-25 17:11 - Updated: 2026-03-06 12:07
Summary
Kwetsbaarheden verholpen in Cisco Catalyst SD-WAN Manager

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 de Cisco Catalyst SD-WAN Manager.
Interpretaties
De kwetsbaarheden bevinden zich in de peering authenticatiemechanismen van de Cisco Catalyst SD-WAN Controller en Manager producten. Deze kwetsbaarheden stellen een niet-geauthenticeerde externe aanvaller in staat om het authenticatieproces te omzeilen, waardoor administratieve privileges op de getroffen systemen kunnen worden verkregen. Daarnaast kunnen aanvallers root-level privileges verkrijgen, wat kan leiden tot ongeautoriseerde toegang tot gevoelige informatie en de mogelijkheid om willekeurige bestanden te overschrijven, wat kan resulteren in verdere exploitatie of systeeminstabiliteit. De meest ernstige kwetsbaarheid, met kenmerk CVE-2026-20127, kan door een ongeauthenticeerde kwaadwillende worden misbruikt om op afstand willekeurige code uit te voeren met hoge administratieve rechten. Cisco geeft aan dat actief misbruik van deze kwetsbaarheid bekend is. Na misbruik van deze kwetsbaarheid zou de kwaadwillende de kwetsbaarheid met kenmerk CVE-2022-20775 gebruiken om de rechten te escaleren tot root. Dit doet de actor door het systeem te downgraden naar een versie waarin CVE-2022-20775 niet verholpen is, de rechten middels deze kwetsbaarheid te verhogen naar root en vervolgens het systeem weer terug te zetten in de oorspronkelijke versie. Er is publieke Proof-of-Concept-code (PoC) verschenen die de kwetsbaarheid met kenmerk CVE-2026-20127 aantoont en mogelijk misbruikt. De kans op grootschalig misbruik neemt hierdoor toe en het NCSC verwacht een significante toename in scan- en misbruikverkeer. Het NCSC adviseert met klem de update zo spoedig mogelijk te installeren. Ook van de kwetsbaarheden met kenmerk CVE-2026-20122 en CVE-2026-20128 meldt Cisco berichten te ontvangen dat deze actief worden misbruikt. Voor deze kwetsbaarheden is (nog) geen publieke Proof-of-Concept-code of exploit beschikbaar.
Oplossingen
Cisco heeft updates uitgebracht om de kwetsbaarheden te verhelpen. In een blog geeft Talos informatie over het bekende misbruik en is er een validatie checklist beschikbaar gesteld met uitleg hoe deze kan worden toegepast. Zie bijgevoegde referenties voor meer informatie.
Kans
high
Schade
high
CWE-200
Exposure of Sensitive Information to an Unauthorized Actor
CWE-257
Storing Passwords in a Recoverable Format
CWE-287
Improper Authentication
CWE-648
Incorrect Use of Privileged APIs
To clipboard 

{
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    "notes": [
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        "category": "legal_disclaimer",
        "text": "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:\n\n    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.\n\n    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.\n    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."
      },
      {
        "category": "description",
        "text": "Cisco heeft meerdere kwetsbaarheden verholpen in de Cisco Catalyst SD-WAN Manager.",
        "title": "Feiten"
      },
      {
        "category": "description",
        "text": "De kwetsbaarheden bevinden zich in de peering authenticatiemechanismen van de Cisco Catalyst SD-WAN Controller en Manager producten. Deze kwetsbaarheden stellen een niet-geauthenticeerde externe aanvaller in staat om het authenticatieproces te omzeilen, waardoor administratieve privileges op de getroffen systemen kunnen worden verkregen. Daarnaast kunnen aanvallers root-level privileges verkrijgen, wat kan leiden tot ongeautoriseerde toegang tot gevoelige informatie en de mogelijkheid om willekeurige bestanden te overschrijven, wat kan resulteren in verdere exploitatie of systeeminstabiliteit.\n\nDe meest ernstige kwetsbaarheid, met kenmerk CVE-2026-20127, kan door een ongeauthenticeerde kwaadwillende worden misbruikt om op afstand willekeurige code uit te voeren met hoge administratieve rechten. Cisco geeft aan dat actief misbruik van deze kwetsbaarheid bekend is.\n\nNa misbruik van deze kwetsbaarheid zou de kwaadwillende de kwetsbaarheid met kenmerk CVE-2022-20775 gebruiken om de rechten te escaleren tot root. Dit doet de actor door het systeem te downgraden naar een versie waarin CVE-2022-20775 niet verholpen is, de rechten middels deze kwetsbaarheid te verhogen naar root en vervolgens het systeem weer terug te zetten in de oorspronkelijke versie.\n\nEr is publieke Proof-of-Concept-code (PoC) verschenen die de kwetsbaarheid met kenmerk CVE-2026-20127 aantoont en mogelijk misbruikt. De kans op grootschalig misbruik neemt hierdoor toe en het NCSC verwacht een significante toename in scan- en misbruikverkeer. Het NCSC adviseert met klem de update zo spoedig mogelijk te installeren.\n\nOok van de kwetsbaarheden met kenmerk CVE-2026-20122 en CVE-2026-20128 meldt Cisco berichten te ontvangen dat deze actief worden misbruikt. Voor deze kwetsbaarheden is (nog) geen publieke Proof-of-Concept-code of exploit beschikbaar.",
        "title": "Interpretaties"
      },
      {
        "category": "description",
        "text": "Cisco heeft updates uitgebracht om de kwetsbaarheden te verhelpen. In een blog geeft Talos informatie over het bekende misbruik en is er een validatie checklist  beschikbaar gesteld met uitleg hoe deze kan worden toegepast. Zie bijgevoegde referenties voor meer informatie.",
        "title": "Oplossingen"
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        "text": "Improper Authentication",
        "title": "CWE-287"
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      {
        "category": "general",
        "text": "Incorrect Use of Privileged APIs",
        "title": "CWE-648"
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    "publisher": {
      "category": "coordinator",
      "contact_details": "cert@ncsc.nl",
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        "summary": "Reference",
        "url": "https://blog.talosintelligence.com/uat-8616-sd-wan"
      },
      {
        "category": "external",
        "summary": "Reference",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-authbp-qwCX8D4v"
      },
      {
        "category": "external",
        "summary": "Reference",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk"
      }
    ],
    "title": "Kwetsbaarheden verholpen in Cisco Catalyst SD-WAN Manager",
    "tracking": {
      "current_release_date": "2026-03-06T12:07:02.595940Z",
      "generator": {
        "date": "2025-08-04T16:30:00Z",
        "engine": {
          "name": "V.A.",
          "version": "1.3"
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      },
      "id": "NCSC-2026-0071",
      "initial_release_date": "2026-02-25T17:11:09.013125Z",
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        {
          "date": "2026-03-06T12:07:02.595940Z",
          "number": "1.0.2",
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          "title": "Summary"
        }
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            "version": "3.1"
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          "products": [
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            "CSAFPID-2"
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      "title": "CVE-2026-20128"
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      "cwe": {
        "id": "CWE-200",
        "name": "Exposure of Sensitive Information to an Unauthorized Actor"
      },
      "notes": [
        {
          "category": "other",
          "text": "Exposure of Sensitive Information to an Unauthorized Actor",
          "title": "CWE-200"
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        {
          "category": "other",
          "text": "Storing Passwords in a Recoverable Format",
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        {
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          "title": "CWE-287"
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        {
          "category": "other",
          "text": "Incorrect Use of Privileged APIs",
          "title": "CWE-648"
        },
        {
          "category": "description",
          "text": "Multiple vulnerabilities in Cisco Catalyst SD-WAN Manager, including an API user authentication flaw, allow unauthenticated remote attackers to gain netadmin-level access, escalate privileges to root, access sensitive data, and overwrite arbitrary files in versions prior to 20.18.",
          "title": "Summary"
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          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20129.json"
        }
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          "products": [
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            "CSAFPID-2"
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      "title": "CVE-2026-20129"
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    {
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        "id": "CWE-200",
        "name": "Exposure of Sensitive Information to an Unauthorized Actor"
      },
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        {
          "category": "other",
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          "title": "CWE-200"
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        {
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          "text": "Storing Passwords in a Recoverable Format",
          "title": "CWE-257"
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        {
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          "title": "CWE-287"
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        {
          "category": "other",
          "text": "Incorrect Use of Privileged APIs",
          "title": "CWE-648"
        },
        {
          "category": "description",
          "text": "Multiple vulnerabilities in Cisco Catalyst SD-WAN Manager allow unauthenticated remote attackers to access sensitive information, escalate privileges to root, and overwrite arbitrary files via insufficient file system access restrictions in the system\u0027s API.",
          "title": "Summary"
        }
      ],
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          "CSAFPID-2"
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          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-20133.json"
        }
      ],
      "scores": [
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
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            "CSAFPID-2"
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      "title": "CVE-2026-20133"
    }
  ]
}


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Sightings

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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.



Detection rules are retrieved from Rulezet.