Critical9.8Cisco Exploited Updated

Critical [CVE-2026-20267 +6] Cisco IOS XE Software Security Hardening Release: August 2026

This critical-severity Cisco advisory covers CVE-2026-20267 and CVE-2026-20268 and 5 more CVEs affecting IOS XE Software.

cisco-sa-hardening-iosxe-V8NMuMZJ Published Aug 5, 2026Updated by vendor Aug 5, 2026

CVE-2026-20267 CVE-2026-20268 CVE-2026-20269 CVE-2026-20270 CVE-2026-20271 CVE-2026-20272 CVE-2026-20273

Affected products & platforms

CiscoIOS XE

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Summary

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.

Affected versions

Scope: These vulnerabilities affect Cisco IOS XE Software when it is running in autonomous or controller mode, regardless of device configuration.
Release 17.9 (first fixed: 17.9.10)
Release 17.12 (first fixed: 17.12.8)
Release 17.15 (first fixed: 17.15.6)
Release 17.18 (first fixed: 17.18.4, 17.18.4a)
Release 26.1 (first fixed: 26.1.2)

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Fixed versions

17.9.10
17.12.8
17.15.6
17.18.4, 17.18.4a
26.1.2

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Upgrade to the first fixed release for your train per the Fixed Releases table in this advisory.
Release 17.9: upgrade to 17.9.10.
Release 17.12: upgrade to 17.12.8.
Release 17.15: upgrade to 17.15.6.
Release 17.18: upgrade to 17.18.4, 17.18.4a.
Release 26.1: upgrade to 26.1.2.

Workaround status

There are no workarounds that address these vulnerabilities.

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Cisco Security Advisoriesofficial
Official vendor source used to discover this advisory; it remains the authority for affected products and remediation. Discovered from the machine-readable feed https://sec.cloudapps.cisco.com/security/center/psirtrss20/CiscoSecurityAdvisory.xml; this link opens the Cisco advisory index instead of the raw feed document.
Cisco
Official vendor advisoryofficial
Official advisory page fetched and parsed; accepted detail fields are attributed to this page.
Cisco

Cross-references

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Official resources

Cisco Software Checker
Official documentation
Official tool to confirm whether your exact IOS / IOS XE / NX-OS / ASA / FTD / SD-WAN release is affected and to find the first fixed release.

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