CVE-2026-20273

Published: Aug 5, 2026Modified: Aug 17, 2026

8.6

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Exploitability: 3.9 / Impact: 4.0

Source: psirt@cisco.com (Secondary)

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.

Affected (267)

Products: Cisco: Ios Xe

Cisco

1 product

Ios Xe

Configuration A

267 vulnerable

Vulnerable Software	Affected Versions
Cisco Ios Xe	Version 16.10.1
Cisco Ios Xe	Version 16.10.1a
Cisco Ios Xe	Version 16.10.1b
Cisco Ios Xe	Version 16.10.1c
Cisco Ios Xe	Version 16.10.1d
Cisco Ios Xe	Version 16.10.1e
Cisco Ios Xe	Version 16.10.1f
Cisco Ios Xe	Version 16.10.1g
Cisco Ios Xe	Version 16.10.1s
Cisco Ios Xe	Version 16.10.2
Cisco Ios Xe	Version 16.10.3
Cisco Ios Xe	Version 16.11.1
Cisco Ios Xe	Version 16.11.1a
Cisco Ios Xe	Version 16.11.1b
Cisco Ios Xe	Version 16.11.1c
Cisco Ios Xe	Version 16.11.1s
Cisco Ios Xe	Version 16.11.2
Cisco Ios Xe	Version 16.12.10
Cisco Ios Xe	Version 16.12.10a
Cisco Ios Xe	Version 16.12.11
Cisco Ios Xe	Version 16.12.12
Cisco Ios Xe	Version 16.12.13
Cisco Ios Xe	Version 16.12.14
Cisco Ios Xe	Version 16.12.15
Cisco Ios Xe	Version 16.12.16
Cisco Ios Xe	Version 16.12.1
Cisco Ios Xe	Version 16.12.1a
Cisco Ios Xe	Version 16.12.1c
Cisco Ios Xe	Version 16.12.1s
Cisco Ios Xe	Version 16.12.1t
Cisco Ios Xe	Version 16.12.1w
Cisco Ios Xe	Version 16.12.1x
Cisco Ios Xe	Version 16.12.1y
Cisco Ios Xe	Version 16.12.1z1
Cisco Ios Xe	Version 16.12.1z2
Cisco Ios Xe	Version 16.12.1z
Cisco Ios Xe	Version 16.12.2
Cisco Ios Xe	Version 16.12.2a
Cisco Ios Xe	Version 16.12.2s
Cisco Ios Xe	Version 16.12.2t
Cisco Ios Xe	Version 16.12.3
Cisco Ios Xe	Version 16.12.3a
Cisco Ios Xe	Version 16.12.3s
Cisco Ios Xe	Version 16.12.4
Cisco Ios Xe	Version 16.12.4a
Cisco Ios Xe	Version 16.12.5
Cisco Ios Xe	Version 16.12.5a
Cisco Ios Xe	Version 16.12.5b
Cisco Ios Xe	Version 16.12.6
Cisco Ios Xe	Version 16.12.6a
Cisco Ios Xe	Version 16.12.7
Cisco Ios Xe	Version 16.12.8
Cisco Ios Xe	Version 16.12.9
Cisco Ios Xe	Version 16.6.10
Cisco Ios Xe	Version 16.6.2
Cisco Ios Xe	Version 16.6.3
Cisco Ios Xe	Version 16.6.4
Cisco Ios Xe	Version 16.6.4a
Cisco Ios Xe	Version 16.6.4s
Cisco Ios Xe	Version 16.6.5
Cisco Ios Xe	Version 16.6.5a
Cisco Ios Xe	Version 16.6.5b
Cisco Ios Xe	Version 16.6.6
Cisco Ios Xe	Version 16.6.7
Cisco Ios Xe	Version 16.6.7a
Cisco Ios Xe	Version 16.6.8
Cisco Ios Xe	Version 16.6.9
Cisco Ios Xe	Version 16.7.1
Cisco Ios Xe	Version 16.7.1a
Cisco Ios Xe	Version 16.7.1b
Cisco Ios Xe	Version 16.7.2
Cisco Ios Xe	Version 16.7.3
Cisco Ios Xe	Version 16.7.4
Cisco Ios Xe	Version 16.8.1
Cisco Ios Xe	Version 16.8.1a
Cisco Ios Xe	Version 16.8.1b
Cisco Ios Xe	Version 16.8.1c
Cisco Ios Xe	Version 16.8.1d
Cisco Ios Xe	Version 16.8.1e
Cisco Ios Xe	Version 16.8.1s
Cisco Ios Xe	Version 16.8.2
Cisco Ios Xe	Version 16.8.3
Cisco Ios Xe	Version 16.9.1
Cisco Ios Xe	Version 16.9.1a
Cisco Ios Xe	Version 16.9.1b
Cisco Ios Xe	Version 16.9.1c
Cisco Ios Xe	Version 16.9.1d
Cisco Ios Xe	Version 16.9.1s
Cisco Ios Xe	Version 16.9.2
Cisco Ios Xe	Version 16.9.2a
Cisco Ios Xe	Version 16.9.2s
Cisco Ios Xe	Version 16.9.3
Cisco Ios Xe	Version 16.9.3a
Cisco Ios Xe	Version 16.9.3h
Cisco Ios Xe	Version 16.9.3s
Cisco Ios Xe	Version 16.9.4
Cisco Ios Xe	Version 16.9.4c
Cisco Ios Xe	Version 16.9.5
Cisco Ios Xe	Version 16.9.5f
Cisco Ios Xe	Version 16.9.6
Cisco Ios Xe	Version 16.9.7
Cisco Ios Xe	Version 16.9.8
Cisco Ios Xe	Version 16.9.8a
Cisco Ios Xe	Version 16.9.8b
Cisco Ios Xe	Version 17.1.1
Cisco Ios Xe	Version 17.1.1a
Cisco Ios Xe	Version 17.1.1s
Cisco Ios Xe	Version 17.1.1t
Cisco Ios Xe	Version 17.1.2
Cisco Ios Xe	Version 17.1.3
Cisco Ios Xe	Version 17.10.1
Cisco Ios Xe	Version 17.10.1a
Cisco Ios Xe	Version 17.10.1b
Cisco Ios Xe	Version 17.11.1
Cisco Ios Xe	Version 17.11.1a
Cisco Ios Xe	Version 17.12.1
Cisco Ios Xe	Version 17.12.1a
Cisco Ios Xe	Version 17.12.1w
Cisco Ios Xe	Version 17.12.1x
Cisco Ios Xe	Version 17.12.1y
Cisco Ios Xe	Version 17.12.1z1
Cisco Ios Xe	Version 17.12.1z2
Cisco Ios Xe	Version 17.12.1z3
Cisco Ios Xe	Version 17.12.1z4
Cisco Ios Xe	Version 17.12.1z5
Cisco Ios Xe	Version 17.12.1z6
Cisco Ios Xe	Version 17.12.1z
Cisco Ios Xe	Version 17.12.2
Cisco Ios Xe	Version 17.12.2a
Cisco Ios Xe	Version 17.12.3
Cisco Ios Xe	Version 17.12.3a
Cisco Ios Xe	Version 17.12.4
Cisco Ios Xe	Version 17.12.4a
Cisco Ios Xe	Version 17.12.4b
Cisco Ios Xe	Version 17.12.5
Cisco Ios Xe	Version 17.12.5a
Cisco Ios Xe	Version 17.12.5b
Cisco Ios Xe	Version 17.12.5c
Cisco Ios Xe	Version 17.12.5d
Cisco Ios Xe	Version 17.12.6
Cisco Ios Xe	Version 17.12.6a
Cisco Ios Xe	Version 17.12.6b
Cisco Ios Xe	Version 17.12.7
Cisco Ios Xe	Version 17.12.7a
Cisco Ios Xe	Version 17.12.7b
Cisco Ios Xe	Version 17.13.1
Cisco Ios Xe	Version 17.13.1a
Cisco Ios Xe	Version 17.14.1
Cisco Ios Xe	Version 17.14.1a
Cisco Ios Xe	Version 17.15.1
Cisco Ios Xe	Version 17.15.1a
Cisco Ios Xe	Version 17.15.1b
Cisco Ios Xe	Version 17.15.1w
Cisco Ios Xe	Version 17.15.1x
Cisco Ios Xe	Version 17.15.1y
Cisco Ios Xe	Version 17.15.2
Cisco Ios Xe	Version 17.15.2a
Cisco Ios Xe	Version 17.15.2b
Cisco Ios Xe	Version 17.15.2c
Cisco Ios Xe	Version 17.15.3
Cisco Ios Xe	Version 17.15.3a
Cisco Ios Xe	Version 17.15.3b
Cisco Ios Xe	Version 17.15.4
Cisco Ios Xe	Version 17.15.4a
Cisco Ios Xe	Version 17.15.4b
Cisco Ios Xe	Version 17.15.4c
Cisco Ios Xe	Version 17.15.4d
Cisco Ios Xe	Version 17.15.4s1
Cisco Ios Xe	Version 17.15.5
Cisco Ios Xe	Version 17.15.5a
Cisco Ios Xe	Version 17.15.7
Cisco Ios Xe	Version 17.16.1
Cisco Ios Xe	Version 17.16.1a
Cisco Ios Xe	Version 17.17.1
Cisco Ios Xe	Version 17.18.1a
Cisco Ios Xe	Version 17.18.1w
Cisco Ios Xe	Version 17.18.1x
Cisco Ios Xe	Version 17.18.1y
Cisco Ios Xe	Version 17.18.1z
Cisco Ios Xe	Version 17.18.2
Cisco Ios Xe	Version 17.18.3
Cisco Ios Xe	Version 17.18.3a
Cisco Ios Xe	Version 17.2.1
Cisco Ios Xe	Version 17.2.1a
Cisco Ios Xe	Version 17.2.1r
Cisco Ios Xe	Version 17.2.1v
Cisco Ios Xe	Version 17.2.2
Cisco Ios Xe	Version 17.2.3
Cisco Ios Xe	Version 17.3.1
Cisco Ios Xe	Version 17.3.1a
Cisco Ios Xe	Version 17.3.1w
Cisco Ios Xe	Version 17.3.1x
Cisco Ios Xe	Version 17.3.1z
Cisco Ios Xe	Version 17.3.2
Cisco Ios Xe	Version 17.3.2a
Cisco Ios Xe	Version 17.3.3
Cisco Ios Xe	Version 17.3.3a
Cisco Ios Xe	Version 17.3.4
Cisco Ios Xe	Version 17.3.4a
Cisco Ios Xe	Version 17.3.4b
Cisco Ios Xe	Version 17.3.4c
Cisco Ios Xe	Version 17.3.5
Cisco Ios Xe	Version 17.3.5a
Cisco Ios Xe	Version 17.3.5b
Cisco Ios Xe	Version 17.3.6
Cisco Ios Xe	Version 17.3.7
Cisco Ios Xe	Version 17.3.8
Cisco Ios Xe	Version 17.3.8a
Cisco Ios Xe	Version 17.4.1
Cisco Ios Xe	Version 17.4.1a
Cisco Ios Xe	Version 17.4.1b
Cisco Ios Xe	Version 17.4.1c
Cisco Ios Xe	Version 17.4.2
Cisco Ios Xe	Version 17.4.2a
Cisco Ios Xe	Version 17.5.1
Cisco Ios Xe	Version 17.5.1a
Cisco Ios Xe	Version 17.6.1
Cisco Ios Xe	Version 17.6.1a
Cisco Ios Xe	Version 17.6.1x
Cisco Ios Xe	Version 17.6.1z1
Cisco Ios Xe	Version 17.6.1z
Cisco Ios Xe	Version 17.6.2
Cisco Ios Xe	Version 17.6.3
Cisco Ios Xe	Version 17.6.3a
Cisco Ios Xe	Version 17.6.4
Cisco Ios Xe	Version 17.6.5
Cisco Ios Xe	Version 17.6.5a
Cisco Ios Xe	Version 17.6.6
Cisco Ios Xe	Version 17.6.6a
Cisco Ios Xe	Version 17.6.7
Cisco Ios Xe	Version 17.6.8
Cisco Ios Xe	Version 17.6.8a
Cisco Ios Xe	Version 17.7.1
Cisco Ios Xe	Version 17.7.1a
Cisco Ios Xe	Version 17.7.1b
Cisco Ios Xe	Version 17.7.2
Cisco Ios Xe	Version 17.8.1
Cisco Ios Xe	Version 17.8.1a
Cisco Ios Xe	Version 17.9.1
Cisco Ios Xe	Version 17.9.1a
Cisco Ios Xe	Version 17.9.1w
Cisco Ios Xe	Version 17.9.1x1
Cisco Ios Xe	Version 17.9.1x
Cisco Ios Xe	Version 17.9.1y1
Cisco Ios Xe	Version 17.9.1y
Cisco Ios Xe	Version 17.9.2
Cisco Ios Xe	Version 17.9.2a
Cisco Ios Xe	Version 17.9.3
Cisco Ios Xe	Version 17.9.3a
Cisco Ios Xe	Version 17.9.4
Cisco Ios Xe	Version 17.9.4a
Cisco Ios Xe	Version 17.9.5
Cisco Ios Xe	Version 17.9.5a
Cisco Ios Xe	Version 17.9.5b
Cisco Ios Xe	Version 17.9.5c
Cisco Ios Xe	Version 17.9.5d
Cisco Ios Xe	Version 17.9.5e
Cisco Ios Xe	Version 17.9.5f
Cisco Ios Xe	Version 17.9.6
Cisco Ios Xe	Version 17.9.6a
Cisco Ios Xe	Version 17.9.7
Cisco Ios Xe	Version 17.9.7a
Cisco Ios Xe	Version 17.9.7b
Cisco Ios Xe	Version 17.9.8
Cisco Ios Xe	Version 17.9.9
Cisco Ios Xe	Version 26.1.1
Cisco Ios Xe	Version 26.1.1a

Related CWEs

CWE-20

Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

References (2)

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-iosxe-V8NMuMZJ

Source: psirt@cisco.com

Vendor Advisory

https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification

Source: af854a3a-2127-422b-91ae-364da2661108

Not Applicable

Timeline

No history available yet.