CVE-2026-20267
Received Received - Intake

Improper Access Control in Cisco IOS XE Software

Publication date: 2026-08-05

Last updated on: 2026-08-05

Assigner: Cisco Systems, Inc.

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 software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20267 are related to improper access control issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-284.

CVSS Scores

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Meta Information

Published
2026-08-05
Last Modified
2026-08-05
Generated
2026-08-05
AI Q&A
2026-08-05
EPSS Evaluated
N/A
NVD
CVE-2026-20267
EUVD
EUVD-2026-53453

Affected Vendors & Products

Showing 11 associated CPEs
Vendor Product Version / Range
cisco ios_xe *
cisco ios_xe 17.9.10
cisco ios_xe 17.12.8
cisco ios_xe 17.15.6
cisco ios_xe 17.18.4
cisco ios_xe 26.1.2
cisco ios_xe 17.9
cisco ios_xe 17.12
cisco ios_xe 17.15
cisco ios_xe 17.18
cisco ios_xe 26.1

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-284 The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

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Executive Summary

CVE-2026-20267 is a vulnerability in Cisco IOS XE Software discovered during an internal security review. It falls under CWE-284, which covers improper access control issues such as authorization, authentication, privilege management, and bypasses. The vulnerability has a critical CVSS base score of 9.0.

Detection Guidance

Detection requires checking Cisco IOS XE Software versions against affected releases (17.9, 17.12, 17.15, 17.18, 26.1). Use commands like 'show version' to verify software versions. Compare against fixed releases (e.g., 17.9.10, 17.12.8).

Impact Analysis

This vulnerability could allow unauthorized access, privilege escalation, or control over affected Cisco IOS XE devices. Since it affects multiple software releases, systems running vulnerable versions may be compromised, leading to potential data breaches or device manipulation.

Compliance Impact

The vulnerability's improper access control (CWE-284) could lead to unauthorized access, compromising data confidentiality and integrity. This may violate compliance requirements under GDPR (data protection) and HIPAA (healthcare data security) by enabling unauthorized data breaches or access to sensitive information.

Mitigation Strategies

Upgrade to fixed software releases such as 17.9.10, 17.12.8, 17.15.6, 17.18.4, or 26.1.2. No workarounds are available.

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