Cisco Releases Fixes for Critical IOS XE Vulnerabilities Published: 5 August 2026 Cisco has released security updates addressing several vulnerabilities in Cisco IOS XE Software, with the most serious issue rated CVSS 9.8. The vulnerabilities were discovered during...

[UK Sentinel]

Published: 5 August 2026

Cisco has released security updates addressing several vulnerabilities in Cisco IOS XE Software, with the most serious issue rated CVSS 9.8.

The vulnerabilities were discovered during Cisco’s internal security testing and are not currently known to be actively exploited. Cisco says there are no workarounds, so affected devices should be upgraded to a fixed release.

Fixed versions:

• IOS XE 17.9.10
• IOS XE 17.12.8
• IOS XE 17.15.6
• IOS XE 17.18.4 / 17.18.4a
• IOS XE 26.1.2

Cisco recommends upgrading to the appropriate fixed release or a later supported version.

 

Source: Cisco Security Advisory – IOS XE Software Security Hardening Release

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