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CVE-2026-20267: Improper Access Control in Cisco Cisco IOS XE Software

0
Critical
VulnerabilityCVE-2026-20267cvecve-2026-20267
Published: 08/05/2026 (08/05/2026, 16:18:50 UTC)
Source: CVE Database V5
Vendor/Project: Cisco
Product: Cisco IOS XE Software

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 v3.1

Score 9.0critical

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected software

Affected versions
=17.2.1a=16.12.1y=16.12.3s=16.7.1b=16.6.2=16.6.5=16.12.1w=16.9.1d=17.3.1=16.9.4c=16.7.1=17.2.1=16.6.8=16.9.1b=16.9.2s=16.12.4=16.12.3a=17.1.1s=16.11.1a=16.7.2=16.11.1b=16.9.1s=16.9.3h=16.9.1c=16.6.5a=16.6.3=16.10.1f=17.2.1v=16.8.1e=16.9.3a=16.12.1a=16.12.1x=16.6.4s=16.10.1c=16.12.3=16.11.2=16.6.5b=16.12.2s=16.10.1b=16.7.3=16.6.7=16.9.6=16.9.2=16.10.1=16.12.1t=16.9.1=16.8.1a=16.9.3s=16.6.7a=16.12.2=16.11.1=16.9.3=16.11.1s=16.12.1=17.1.1=17.1.2=16.10.1d=17.1.1t=16.9.4=16.8.3=16.12.2t=16.9.5=16.8.1s=16.10.1e=16.8.2=16.6.4=16.8.1b=16.10.1a=16.12.1z=16.8.1c=16.9.1a=16.9.5f=16.6.4a=16.10.1g=16.8.1=16.6.6=16.9.2a=16.8.1d=16.10.3=16.7.1a=16.11.1c=16.10.1s=17.2.1r=17.1.1a=16.10.2=16.12.2a=16.12.1c=16.12.1s=16.7.4=17.2.2=16.9.8=16.9.7=17.1.3=17.3.1a=17.3.2a=16.12.5=17.3.1w=17.3.2=17.4.1=16.12.4a=17.4.1a=17.3.1x=17.3.3=16.6.9=17.2.3=17.5.1=16.12.1z1=16.12.5a=17.4.1b=17.3.1z=16.12.5b=17.4.2=17.3.3a=17.3.5=17.3.4=17.5.1a=16.12.6=17.6.1=16.12.1z2=16.6.10=17.3.4a=17.6.1a=17.7.1=17.6.1x=17.6.2=16.12.6a=17.3.4c=17.4.2a=17.3.4b=17.7.1a=16.12.7=17.8.1a=17.6.3a=17.6.3=17.7.2=17.7.1b=17.9.1w=17.3.5a=17.6.1z=16.12.8=17.8.1=17.9.1=17.6.4=17.3.5b=17.9.1a=17.3.6=17.10.1=16.9.8a=17.6.1z1=17.10.1a=17.9.2=17.6.5=17.9.1x=17.9.1y=16.9.8b=17.3.7=17.9.2a=17.9.3=16.12.9=17.11.1=17.10.1b=17.6.6=17.9.1x1=17.11.1a=17.9.3a=17.12.1=17.3.8=17.9.4=16.12.10=17.12.1w=17.9.1y1=17.12.1a=17.9.5=17.13.1=17.12.1x=17.12.2=17.14.1=17.9.4a=17.3.8a=17.6.6a=17.6.5a=17.6.7=16.12.10a=17.15.1=17.13.1a=17.12.2a=16.12.11=17.12.3=17.12.1y=17.12.1z=17.9.5a=17.14.1a=17.9.5b=17.6.8=16.12.12=17.12.4=17.9.6=17.17.1=17.16.1=17.15.1w=17.12.3a=17.9.5c=17.15.1a=17.12.1z1=17.15.2=17.15.1b=17.9.5d=17.15.1x=17.9.6a=17.12.1z2=17.6.8a=17.16.1a=16.12.13=17.15.3=17.9.7=17.12.5=17.15.1y=17.9.5e=17.12.4a=17.15.2a=17.15.2c=17.15.2b=17.12.1z3=17.9.5f=17.12.4b=17.12.5a=17.18.1=17.12.6=17.12.1z4=17.9.8=17.9.7a=17.15.3a=17.15.4=17.12.5b=17.15.3b=16.12.14=17.18.1z=17.9.7b=17.12.5c=26.1.1=17.18.1a=17.15.4a=17.18.2=17.18.1w=17.15.4b=17.12.6a=17.12.7=17.15.4c=17.9.9=17.12.5d=16.12.15=17.15.4s1=17.15.5=17.12.1z5=17.18.1x=17.12.1z6=17.15.4d=17.12.6b=17.4.1c=17.15.5a=17.18.1y=17.12.7a=17.18.3=17.12.7b=17.18.3a=26.1.1a=17.15.7=16.12.1617.2.1a16.12.1y16.12.3s16.7.1b16.6.216.6.516.12.1w16.9.1d17.3.116.9.4c16.7.117.2.116.6.816.9.1b16.9.2s16.12.416.12.3a17.1.1s16.11.1a16.7.216.11.1b16.9.1s16.9.3h16.9.1c16.6.5a16.6.316.10.1f17.2.1v16.8.1e16.9.3a16.12.1a16.12.1x16.6.4s16.10.1c16.12.316.11.216.6.5b16.12.2s16.10.1b16.7.316.6.716.9.616.9.216.10.116.12.1t16.9.116.8.1a16.9.3s16.6.7a16.12.216.11.116.9.316.11.1s16.12.117.1.117.1.216.10.1d17.1.1t16.9.416.8.316.12.2t16.9.516.8.1s16.10.1e16.8.216.6.416.8.1b16.10.1a16.12.1z16.8.1c16.9.1a16.9.5f16.6.4a16.10.1g16.8.116.6.616.9.2a16.8.1d16.10.316.7.1a16.11.1c16.10.1s17.2.1r17.1.1a16.10.216.12.2a16.12.1c16.12.1s16.7.417.2.216.9.816.9.717.1.317.3.1a17.3.2a16.12.517.3.1w17.3.217.4.116.12.4a17.4.1a17.3.1x17.3.316.6.917.2.317.5.116.12.1z116.12.5a17.4.1b17.3.1z16.12.5b17.4.217.3.3a17.3.517.3.417.5.1a16.12.617.6.116.12.1z216.6.1017.3.4a17.6.1a17.7.117.6.1x17.6.216.12.6a17.3.4c17.4.2a17.3.4b17.7.1a16.12.717.8.1a17.6.3a17.6.317.7.217.7.1b17.9.1w17.3.5a17.6.1z16.12.817.8.117.9.117.6.417.3.5b17.9.1a17.3.617.10.116.9.8a17.6.1z117.10.1a17.9.217.6.517.9.1x17.9.1y16.9.8b17.3.717.9.2a17.9.316.12.917.11.117.10.1b17.6.617.9.1x117.11.1a17.9.3a17.12.117.3.817.9.416.12.1017.12.1w17.9.1y117.12.1a17.9.517.13.117.12.1x17.12.217.14.117.9.4a17.3.8a17.6.6a17.6.5a17.6.716.12.10a17.15.117.13.1a17.12.2a16.12.1117.12.317.12.1y17.12.1z17.9.5a17.14.1a17.9.5b17.6.816.12.1217.12.417.9.617.17.117.16.117.15.1w17.12.3a17.9.5c17.15.1a17.12.1z117.15.217.15.1b17.9.5d17.15.1x17.9.6a17.12.1z217.6.8a17.16.1a16.12.1317.15.317.9.717.12.517.15.1y17.9.5e17.12.4a17.15.2a17.15.2c17.15.2b17.12.1z317.9.5f17.12.4b17.12.5a17.18.117.12.617.12.1z417.9.817.9.7a17.15.3a17.15.417.12.5b17.15.3b16.12.1417.18.1z17.9.7b17.12.5c26.1.117.18.1a17.15.4a17.18.217.18.1w17.15.4b17.12.6a17.12.717.15.4c17.9.917.12.5d16.12.1517.15.4s117.15.517.12.1z517.18.1x17.12.1z617.15.4d17.12.6b17.4.1c17.15.5a17.18.1y17.12.7a17.18.317.12.7b17.18.3a26.1.1a17.15.716.12.16

Technical Details

Data Version
5.2
Assigner Short Name
cisco
Date Reserved
2025-10-08T11:59:15.402Z
Cvss Version
3.1
State
PUBLISHED
Remediation Level
null

Threat ID: 6a736b60bf8831d5392da488

Added to database: 08/05/2026, 16:57:04 UTC

Last updated: 08/05/2026, 18:01:59 UTC

Views: 2

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