NCSC-2026-0277

Vulnerability from csaf_ncscnl - Published: 2026-08-06 07:18 - Updated: 2026-08-06 07:18
Summary
Kwetsbaarheden verholpen in Cisco Catalyst SD-WAN
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 Catalyst SD-WAN.
Interpretaties: De gevonden problemen betreffen onder andere onjuiste inputvalidatie, onjuiste toegangscontrole, onjuiste linkresolutie voorafgaand aan bestandsaccess en het opslaan van gevoelige informatie in cleartext. Door deze kwetsbaarheden kan de software mogelijk onbedoeld gedrag vertonen bij het verwerken van invoer, het controleren van toegangsrechten, het openen van bestanden, en het beschermen van gevoelige data.
Oplossingen: Cisco heeft updates uitgebracht. Zie bijgevoegde referenties voor meer informatie.
Kans: medium
Schade: high
CWE-20: Improper Input Validation
CWE-59: Improper Link Resolution Before File Access ('Link Following')
CWE-284: Improper Access Control
CWE-312: Cleartext Storage of Sensitive Information
CWE-1284: Improper Validation of Specified Quantity in Input
CVE-2026-20303

Cisco's Catalyst SD-WAN engineering teams conducted internal security reviews resulting in software hardening releases that address multiple vulnerabilities, including improper input validation (CVE-2026-20303, CWE-20).

9.9 (Critical)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE-1284 - Improper Validation of Specified Quantity in Input
Affected products
Product Identifier Version Remediation
vers:unknown/*
Cisco / Catalyst SD-WAN Manager
 vers:unknown/*
vers:unknown/*
Cisco / Cisco Catalyst SD-WAN Controller
 vers:unknown/*
CVE-2026-20304

Cisco's Catalyst SD-WAN engineering team conducted internal security reviews resulting in software hardening releases that address multiple vulnerabilities, including improper access control (CVE-2026-20304, CWE-284).

9.9 (Critical)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE-1284 - Improper Validation of Specified Quantity in Input
Affected products
Product Identifier Version Remediation
vers:unknown/*
Cisco / Catalyst SD-WAN Manager
 vers:unknown/*
vers:unknown/*
Cisco / Cisco Catalyst SD-WAN Controller
 vers:unknown/*
CVE-2026-20310

Cisco's Catalyst SD-WAN engineering team conducted an internal security review resulting in software hardening releases that address multiple vulnerabilities, including improper link resolution before file access (CVE-2026-20310, CWE-59).

9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Affected products
Product Identifier Version Remediation
vers:unknown/*
Cisco / Catalyst SD-WAN Manager
 vers:unknown/*
vers:unknown/*
Cisco / Cisco Catalyst SD-WAN Controller
 vers:unknown/*
CVE-2026-20312

Cisco's Catalyst SD-WAN engineering teams conducted internal security reviews resulting in software hardening releases that address multiple vulnerabilities, including cleartext storage of sensitive information (CVE-2026-20312, CWE-312).

8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-312 - Cleartext Storage of Sensitive Information
Affected products
Product Identifier Version Remediation
vers:unknown/*
Cisco / Catalyst SD-WAN Manager
 vers:unknown/*
vers:unknown/*
Cisco / Cisco Catalyst SD-WAN Controller
 vers:unknown/*
CVE-2026-20313

Cisco's Catalyst SD-WAN engineering team conducted an internal security review resulting in software hardening releases that address multiple vulnerabilities, including CVE-2026-20313 related to improper link resolution before file access.

7.7 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
CWE-1284 - Improper Validation of Specified Quantity in Input
Affected products
Product Identifier Version Remediation
vers:unknown/*
Cisco / Catalyst SD-WAN Manager
 vers:unknown/*
vers:unknown/*
Cisco / Cisco Catalyst SD-WAN Controller
 vers:unknown/*
References
To clipboard 

{
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    "distribution": {
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    "notes": [
      {
        "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 Cisco Catalyst SD-WAN.",
        "title": "Feiten"
      },
      {
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        "text": "De gevonden problemen betreffen onder andere onjuiste inputvalidatie, onjuiste toegangscontrole, onjuiste linkresolutie voorafgaand aan bestandsaccess en het opslaan van gevoelige informatie in cleartext. Door deze kwetsbaarheden kan de software mogelijk onbedoeld gedrag vertonen bij het verwerken van invoer, het controleren van toegangsrechten, het openen van bestanden, en het beschermen van gevoelige data.",
        "title": "Interpretaties"
      },
      {
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        "title": "Oplossingen"
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          "text": "Improper Link Resolution Before File Access (\u0027Link Following\u0027)",
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        }
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    }
  ]
}



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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.


Detection rules are retrieved from Rulezet.