CVE-2026-20303

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Catalyst SD-WAN engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20303 are related to improper input validation issues that are grouped under the Common Weakness Enumeration (CWE) CWE-20.

CVSS v3 9.9 CRITICAL

9.9^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.1 / Impact : 6.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

References

Link	Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-sdwan-faLcR3K
https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification

Configurations

No configuration.

History

23 Oct 2026, 21:10

Type	Values Removed	Values Added
Summary		(es) Como parte del compromiso continuo de Cisco con la seguridad proactiva y la calidad del producto, el equipo de ingeniería de Cisco Catalyst SD-WAN ha llevado a cabo una revisión de seguridad interna exhaustiva. Esta revisión dio como resultado lanzamientos de fortalecimiento de software que abordan múltiples vulnerabilidades descubiertas internamente. Las vulnerabilidades rastreadas por CVE-2026-20303 están relacionadas con problemas de validación de entrada incorrecta que se agrupan bajo la enumeración de debilidades comunes (CWE) CWE-20.

Information

Published : 2026-08-05 17:16

Updated : 2026-10-23 21:10

NVD link : CVE-2026-20303

Mitre link : CVE-2026-20303

CVE.ORG link : CVE-2026-20303

JSON object : View

Products Affected

No product.

CWE

CWE-20

Improper Input Validation

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"20.15.5"}, {"status": "affected", "version": "20.15.5_LI_Images"}, {"status": "affected", "version": "20.12.7"}, {"status": "affected", "version": "20.12.7_LI_Images"}, {"status": "affected", "version": "20.9.9"}, {"status": "affected", "version": "20.9.9_LI_Images"}, {"status": "affected", "version": "20.18.2.2"}, {"status": "affected", "version": "20.18.2.2_LI_Images"}, {"status": "affected", "version": "20.12.5.4"}, {"status": "affected", "version": "20.12.5.4_LI_ Images"}, {"status": "affected", "version": "20.12.7.1_LI_Images"}, {"status": "affected", "version": "20.12.6.2_LI_Images"}, {"status": "affected", "version": "20.12.7.1"}, {"status": "affected", "version": "20.15.5.1"}, {"status": "affected", "version": "20.15.4.3"}, {"status": "affected", "version": "20.15.4.3_LI_Images"}, {"status": "affected", "version": "20.15.5.1_LI_Images"}, {"status": "affected", "version": "20.12.6.2"}, {"status": "affected", "version": "20.15.5.2"}, {"status": "affected", "version": "20.15.5.2_LI_Images"}, {"status": "affected", "version": "26.1.1.1_LI_Images"}, {"status": "affected", "version": "20.15.4.4"}, {"status": "affected", "version": "20.15.4.4_LI_Images"}, {"status": "affected", "version": "26.1.1.1"}, {"status": "affected", "version": "20.9.9.1_LI_Images"}, {"status": "affected", "version": "20.9.9.1"}, {"status": "affected", "version": "20.18.3.1_LI_Images"}, {"status": "affected", "version": "20.18.3.1"}, {"status": "affected", "version": "26.1.1.2"}, {"status": "affected", "version": "26.1.1.2_LI_Images"}, {"status": "affected", "version": "20.15.4.5"}, {"status": "affected", "version": "20.15.4.5_LI_Images"}, {"status": "affected", "version": "20.15.5.3"}, {"status": "affected", "version": "20.15.5.3_LI_Images"}, {"status": "affected", "version": "20.12.7.2_LI_Images"}, {"status": "affected", "version": "20.12.7.2"}, {"status": "affected", "version": "20.9.9.2"}, {"status": "affected", "version": "20.9.9.2_LI_Images"}, {"status": "affected", "version": "20.15.6"}, {"status": "affected", "version": "20.15.6_LI_Images"}], "defaultStatus": "unknown"}]}], "published": "2026-08-05T17:16:50.513", "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-sdwan-faLcR3K", "source": "psirt@cisco.com"}, {"url": "https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification", "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "psirt@cisco.com", "description": [{"lang": "en", "value": "CWE-20"}]}], "descriptions": [{"lang": "en", "value": "As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Catalyst SD-WAN engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.\r\n\r\nThe vulnerabilities tracked by CVE-2026-20303 are related to improper input validation issues that are grouped under the Common Weakness Enumeration (CWE) CWE-20."}, {"lang": "es", "value": "Como parte del compromiso continuo de Cisco con la seguridad proactiva y la calidad del producto, el equipo de ingenier\u00eda de Cisco Catalyst SD-WAN ha llevado a cabo una revisi\u00f3n de seguridad interna exhaustiva. Esta revisi\u00f3n dio como resultado lanzamientos de fortalecimiento de software que abordan m\u00faltiples vulnerabilidades descubiertas internamente.\n\nLas vulnerabilidades rastreadas por CVE-2026-20303 est\u00e1n relacionadas con problemas de validaci\u00f3n de entrada incorrecta que se agrupan bajo la enumeraci\u00f3n de debilidades comunes (CWE) CWE-20."}], "lastModified": "2026-10-23T21:10:00.157", "sourceIdentifier": "psirt@cisco.com"}