CVE-2026-20268

Published: Aug 5, 2026Modified: Aug 14, 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 software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20268 are related to issues with improper restriction of operations within the bounds of a memory buffer that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-119.

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-119

Improper Restriction of Operations within the Bounds of a Memory Buffer

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

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

Timeline

No history available yet.