CVE-2026-20273 - Vulnerability Details

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XE Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities.

The vulnerabilities tracked by CVE-2026-20273 are related to improper input validation issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-20.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00252.

Exploitation none

Automatable yes

Technical Impact partial

Vendors	Products
Cisco Subscribe	Ios Xe Software Subscribe

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
Cisco Subscribe	Ios Xe Software Subscribe

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References

Link	Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-iosxe-V8NMuMZJ
https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification

History

Fri, 14 Aug 2026 21:30:00 +0000

Type	Values Removed	Values Added
References		https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification

Fri, 07 Aug 2026 09:30:00 +0000

Type	Values Removed	Values Added
First Time appeared		Cisco Cisco ios Xe Software
Vendors & Products		Cisco Cisco ios Xe Software

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

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, '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 IOS XE Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20273 are related to improper input validation issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-20.
Title		Cisco IOS XE Software Security Hardening Release
Weaknesses		CWE-20
References		https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-iosxe-V8NMuMZJ
Metrics		cvssV3_1 `{'score': 8.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H'}`

Projects

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MITRE

Status: PUBLISHED

Assigner: cisco

Published: 2026-08-05T16:19:38.482Z

Updated: 2026-08-14T21:00:51.637Z

Reserved: 2025-10-08T11:59:15.403Z

Link: CVE-2026-20273

Vulnrichment

Updated: 2026-08-05T17:39:09.576Z

NVD

Status : Undergoing Analysis

Published: 2026-08-05T17:16:49.290

Modified: 2026-08-14T21:17:15.437

Link: CVE-2026-20273

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-08-07T09:15:07Z

Weaknesses

CWE-20

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This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities.\r\n\r\nThe vulnerabilities tracked by CVE-2026-20273 are related to improper input validation issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-20."}], "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-iosxe-V8NMuMZJ", "name": "cisco-sa-hardening-iosxe-V8NMuMZJ"}], "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-iosxe-V8NMuMZJ", "discovery": "INTERNAL", "defects": ["CSCwu18860"]}, "problemTypes": [{"descriptions": [{"lang": "en", "description": "Improper Input Validation", "type": "cwe", "cweId": "CWE-20"}]}], "affected": [{"vendor": "Cisco", "product": "Cisco IOS XE Software", "versions": [{"version": 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"affected", "version": "17.15.4d"}, {"status": "affected", "version": "17.12.6b"}, {"status": "affected", "version": "17.4.1c"}, {"status": "affected", "version": "17.15.5a"}, {"status": "affected", "version": "17.18.1y"}, {"status": "affected", "version": "17.12.7a"}, {"status": "affected", "version": "17.18.3"}, {"status": "affected", "version": "17.12.7b"}, {"status": "affected", "version": "17.18.3a"}, {"status": "affected", "version": "26.1.1a"}, {"status": "affected", "version": "17.15.7"}, {"status": "affected", "version": "16.12.16"}]}], "source": "[email protected]"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XE Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities.\r\n\r\nThe vulnerabilities tracked by CVE-2026-20273 are related to improper input validation issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-20."}], "id": "CVE-2026-20273", "lastModified": "2026-08-14T21:17:15.437", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.0, "source": "[email protected]", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-20273", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-05T17:34:21.831655Z", "version": "2.0.3"}}]}, "published": "2026-08-05T17:16:49.290", "references": [{"source": "[email protected]", "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-iosxe-V8NMuMZJ"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Undergoing Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}], "source": "[email protected]", "type": "Secondary"}]}

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"17.12.5d"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "16.12.15"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.15.4s1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.15.5"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.12.1z5"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.18.1x"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.12.1z6"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.15.4d"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.12.6b"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.4.1c"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.15.5a"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.18.3"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.12.7a"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.18.3a"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "26.1.1a"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.15.7"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "16.12.16"}}], "enrichment": {"confidence": 88.0, "confidence_source": "matching", "scores": [{"score": 88.0, "source": "matching"}]}, "original": {"product": "Cisco IOS XE Software", "source": "cna", "vendor": "Cisco"}, "product": "ios_xe_software", "vendor": "cisco"}], "created": "2026-08-05T20:00:12.185390+00:00", "updated": "2026-08-07T09:15:07.137781+00:00", "vendors": ["cisco", "cisco$PRODUCT$ios_xe_software"]}

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

Exploitation none

Automatable yes

Technical Impact partial

Affected Vendors & Products

Projects

JSON object

JSON object

JSON object

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