CVE-2026-20303 - Vulnerability Details

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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact total

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors	Products

References

Link	Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-sdwan-faLcR3K

History

Wed, 05 Aug 2026 18:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Wed, 05 Aug 2026 17:00:00 +0000

Type	Values Removed	Values Added
Description		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.
Title		Cisco Catalyst SD-WAN Security Hardening Release - Input Validation Vulnerabilities
Weaknesses		CWE-20
References		https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-sdwan-faLcR3K
Metrics		cvssV3_1 `{'score': 9.9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'}`

MITRE

Status: PUBLISHED

Assigner: cisco

Published: 2026-08-05T16:29:52.593Z

Updated: 2026-08-05T17:45:12.920Z

Reserved: 2025-10-08T11:59:15.408Z

Link: CVE-2026-20303

Vulnrichment

Updated: 2026-08-05T17:38:56.268Z

NVD

No data.

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-08-05T19:15:03Z

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{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-20303", "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "state": "PUBLISHED", "assignerShortName": "cisco", "dateReserved": "2025-10-08T11:59:15.408Z", "datePublished": "2026-08-05T16:29:52.593Z", "dateUpdated": "2026-08-05T16:29:52.593Z"}, "containers": {"cna": {"title": "Cisco Catalyst SD-WAN Security Hardening Release - Input Validation Vulnerabilities", "metrics": [{"format": "cvssV3_1", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 9.9, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}}], "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."}], "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-sdwan-faLcR3K", "name": "cisco-sa-hardening-sdwan-faLcR3K"}], "exploits": [{"lang": "en", "value": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory."}], "source": {"advisory": "cisco-sa-hardening-sdwan-faLcR3K", "discovery": "INTERNAL", "defects": ["CSCwu06016"]}, "problemTypes": [{"descriptions": [{"lang": "en", "description": "Improper Input Validation", "type": "cwe", "cweId": "CWE-20"}]}], "affected": [{"vendor": "Cisco", "product": "Cisco Catalyst SD-WAN Controller", "versions": [{"version": 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"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", "status": "affected"}], "defaultStatus": "unknown"}], "providerMetadata": {"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "shortName": "cisco", "dateUpdated": "2026-08-05T16:29:52.593Z"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-20303", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-08-05T17:35:28.618206Z"}}}], "providerMetadata": {"shortName": "CISA-ADP", "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "dateUpdated": "2026-08-05T17:38:56.268Z"}, "title": "CISA ADP Vulnrichment"}]}}

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

Exploitation none

Automatable no

Technical Impact total

Affected Vendors & Products

JSON object

JSON object

JSON object

JSON object

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