CVE-2026-20273

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 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 Software

VendorProductVersion RangeStatus
CiscoCisco IOS XE Software17.2.1aaffected
CiscoCisco IOS XE Software16.12.1yaffected
CiscoCisco IOS XE Software16.12.3saffected
CiscoCisco IOS XE Software16.7.1baffected
CiscoCisco IOS XE Software16.6.2affected
CiscoCisco IOS XE Software16.6.5affected
CiscoCisco IOS XE Software16.12.1waffected
CiscoCisco IOS XE Software16.9.1daffected
CiscoCisco IOS XE Software17.3.1affected
CiscoCisco IOS XE Software16.9.4caffected
CiscoCisco IOS XE Software16.7.1affected
CiscoCisco IOS XE Software17.2.1affected
CiscoCisco IOS XE Software16.6.8affected
CiscoCisco IOS XE Software16.9.1baffected
CiscoCisco IOS XE Software16.9.2saffected
CiscoCisco IOS XE Software16.12.4affected
CiscoCisco IOS XE Software16.12.3aaffected
CiscoCisco IOS XE Software17.1.1saffected
CiscoCisco IOS XE Software16.11.1aaffected
CiscoCisco IOS XE Software16.7.2affected
CiscoCisco IOS XE Software16.11.1baffected
CiscoCisco IOS XE Software16.9.1saffected
CiscoCisco IOS XE Software16.9.3haffected
CiscoCisco IOS XE Software16.9.1caffected
CiscoCisco IOS XE Software16.6.5aaffected
CiscoCisco IOS XE Software16.6.3affected
CiscoCisco IOS XE Software16.10.1faffected
CiscoCisco IOS XE Software17.2.1vaffected
CiscoCisco IOS XE Software16.8.1eaffected
CiscoCisco IOS XE Software16.9.3aaffected
CiscoCisco IOS XE Software16.12.1aaffected
CiscoCisco IOS XE Software16.12.1xaffected
CiscoCisco IOS XE Software16.6.4saffected
CiscoCisco IOS XE Software16.10.1caffected
CiscoCisco IOS XE Software16.12.3affected
CiscoCisco IOS XE Software16.11.2affected
CiscoCisco IOS XE Software16.6.5baffected
CiscoCisco IOS XE Software16.12.2saffected
CiscoCisco IOS XE Software16.10.1baffected
CiscoCisco IOS XE Software16.7.3affected
CiscoCisco IOS XE Software16.6.7affected
CiscoCisco IOS XE Software16.9.6affected
CiscoCisco IOS XE Software16.9.2affected
CiscoCisco IOS XE Software16.10.1affected
CiscoCisco IOS XE Software16.12.1taffected
CiscoCisco IOS XE Software16.9.1affected
CiscoCisco IOS XE Software16.8.1aaffected
CiscoCisco IOS XE Software16.9.3saffected
CiscoCisco IOS XE Software16.6.7aaffected
CiscoCisco IOS XE Software16.12.2affected
CiscoCisco IOS XE Software16.11.1affected
CiscoCisco IOS XE Software16.9.3affected
CiscoCisco IOS XE Software16.11.1saffected
CiscoCisco IOS XE Software16.12.1affected
CiscoCisco IOS XE Software17.1.1affected
CiscoCisco IOS XE Software17.1.2affected
CiscoCisco IOS XE Software16.10.1daffected
CiscoCisco IOS XE Software17.1.1taffected
CiscoCisco IOS XE Software16.9.4affected
CiscoCisco IOS XE Software16.8.3affected
CiscoCisco IOS XE Software16.12.2taffected
CiscoCisco IOS XE Software16.9.5affected
CiscoCisco IOS XE Software16.8.1saffected
CiscoCisco IOS XE Software16.10.1eaffected
CiscoCisco IOS XE Software16.8.2affected
CiscoCisco IOS XE Software16.6.4affected
CiscoCisco IOS XE Software16.8.1baffected
CiscoCisco IOS XE Software16.10.1aaffected
CiscoCisco IOS XE Software16.12.1zaffected
CiscoCisco IOS XE Software16.8.1caffected
CiscoCisco IOS XE Software16.9.1aaffected
CiscoCisco IOS XE Software16.9.5faffected
CiscoCisco IOS XE Software16.6.4aaffected
CiscoCisco IOS XE Software16.10.1gaffected
CiscoCisco IOS XE Software16.8.1affected
CiscoCisco IOS XE Software16.6.6affected
CiscoCisco IOS XE Software16.9.2aaffected
CiscoCisco IOS XE Software16.8.1daffected
CiscoCisco IOS XE Software16.10.3affected
CiscoCisco IOS XE Software16.7.1aaffected
CiscoCisco IOS XE Software16.11.1caffected
CiscoCisco IOS XE Software16.10.1saffected
CiscoCisco IOS XE Software17.2.1raffected
CiscoCisco IOS XE Software17.1.1aaffected
CiscoCisco IOS XE Software16.10.2affected
CiscoCisco IOS XE Software16.12.2aaffected
CiscoCisco IOS XE Software16.12.1caffected
CiscoCisco IOS XE Software16.12.1saffected
CiscoCisco IOS XE Software16.7.4affected
CiscoCisco IOS XE Software17.2.2affected
CiscoCisco IOS XE Software16.9.8affected
CiscoCisco IOS XE Software16.9.7affected
CiscoCisco IOS XE Software17.1.3affected
CiscoCisco IOS XE Software17.3.1aaffected
CiscoCisco IOS XE Software17.3.2aaffected
CiscoCisco IOS XE Software16.12.5affected
CiscoCisco IOS XE Software17.3.1waffected
CiscoCisco IOS XE Software17.3.2affected
CiscoCisco IOS XE Software17.4.1affected
CiscoCisco IOS XE Software16.12.4aaffected
CiscoCisco IOS XE Software17.4.1aaffected
CiscoCisco IOS XE Software17.3.1xaffected
CiscoCisco IOS XE Software17.3.3affected
CiscoCisco IOS XE Software16.6.9affected
CiscoCisco IOS XE Software17.2.3affected
CiscoCisco IOS XE Software17.5.1affected
CiscoCisco IOS XE Software16.12.1z1affected
CiscoCisco IOS XE Software16.12.5aaffected
CiscoCisco IOS XE Software17.4.1baffected
CiscoCisco IOS XE Software17.3.1zaffected
CiscoCisco IOS XE Software16.12.5baffected
CiscoCisco IOS XE Software17.4.2affected
CiscoCisco IOS XE Software17.3.3aaffected
CiscoCisco IOS XE Software17.3.5affected
CiscoCisco IOS XE Software17.3.4affected
CiscoCisco IOS XE Software17.5.1aaffected
CiscoCisco IOS XE Software16.12.6affected
CiscoCisco IOS XE Software17.6.1affected
CiscoCisco IOS XE Software16.12.1z2affected
CiscoCisco IOS XE Software16.6.10affected
CiscoCisco IOS XE Software17.3.4aaffected
CiscoCisco IOS XE Software17.6.1aaffected
CiscoCisco IOS XE Software17.7.1affected
CiscoCisco IOS XE Software17.6.1xaffected
CiscoCisco IOS XE Software17.6.2affected
CiscoCisco IOS XE Software16.12.6aaffected
CiscoCisco IOS XE Software17.3.4caffected
CiscoCisco IOS XE Software17.4.2aaffected
CiscoCisco IOS XE Software17.3.4baffected
CiscoCisco IOS XE Software17.7.1aaffected
CiscoCisco IOS XE Software16.12.7affected
CiscoCisco IOS XE Software17.8.1aaffected
CiscoCisco IOS XE Software17.6.3aaffected
CiscoCisco IOS XE Software17.6.3affected
CiscoCisco IOS XE Software17.7.2affected
CiscoCisco IOS XE Software17.7.1baffected
CiscoCisco IOS XE Software17.9.1waffected
CiscoCisco IOS XE Software17.3.5aaffected
CiscoCisco IOS XE Software17.6.1zaffected
CiscoCisco IOS XE Software16.12.8affected
CiscoCisco IOS XE Software17.8.1affected
CiscoCisco IOS XE Software17.9.1affected
CiscoCisco IOS XE Software17.6.4affected
CiscoCisco IOS XE Software17.3.5baffected
CiscoCisco IOS XE Software17.9.1aaffected
CiscoCisco IOS XE Software17.3.6affected
CiscoCisco IOS XE Software17.10.1affected
CiscoCisco IOS XE Software16.9.8aaffected
CiscoCisco IOS XE Software17.6.1z1affected
CiscoCisco IOS XE Software17.10.1aaffected
CiscoCisco IOS XE Software17.9.2affected
CiscoCisco IOS XE Software17.6.5affected
CiscoCisco IOS XE Software17.9.1xaffected
CiscoCisco IOS XE Software17.9.1yaffected
CiscoCisco IOS XE Software16.9.8baffected
CiscoCisco IOS XE Software17.3.7affected
CiscoCisco IOS XE Software17.9.2aaffected
CiscoCisco IOS XE Software17.9.3affected
CiscoCisco IOS XE Software16.12.9affected
CiscoCisco IOS XE Software17.11.1affected
CiscoCisco IOS XE Software17.10.1baffected
CiscoCisco IOS XE Software17.6.6affected
CiscoCisco IOS XE Software17.9.1x1affected
CiscoCisco IOS XE Software17.11.1aaffected
CiscoCisco IOS XE Software17.9.3aaffected
CiscoCisco IOS XE Software17.12.1affected
CiscoCisco IOS XE Software17.3.8affected
CiscoCisco IOS XE Software17.9.4affected
CiscoCisco IOS XE Software16.12.10affected
CiscoCisco IOS XE Software17.12.1waffected
CiscoCisco IOS XE Software17.9.1y1affected
CiscoCisco IOS XE Software17.12.1aaffected
CiscoCisco IOS XE Software17.9.5affected
CiscoCisco IOS XE Software17.13.1affected
CiscoCisco IOS XE Software17.12.1xaffected
CiscoCisco IOS XE Software17.12.2affected
CiscoCisco IOS XE Software17.14.1affected
CiscoCisco IOS XE Software17.9.4aaffected
CiscoCisco IOS XE Software17.3.8aaffected
CiscoCisco IOS XE Software17.6.6aaffected
CiscoCisco IOS XE Software17.6.5aaffected
CiscoCisco IOS XE Software17.6.7affected
CiscoCisco IOS XE Software16.12.10aaffected
CiscoCisco IOS XE Software17.15.1affected
CiscoCisco IOS XE Software17.13.1aaffected
CiscoCisco IOS XE Software17.12.2aaffected
CiscoCisco IOS XE Software16.12.11affected
CiscoCisco IOS XE Software17.12.3affected
CiscoCisco IOS XE Software17.12.1yaffected
CiscoCisco IOS XE Software17.12.1zaffected
CiscoCisco IOS XE Software17.9.5aaffected
CiscoCisco IOS XE Software17.14.1aaffected
CiscoCisco IOS XE Software17.9.5baffected
CiscoCisco IOS XE Software17.6.8affected
CiscoCisco IOS XE Software16.12.12affected
CiscoCisco IOS XE Software17.12.4affected
CiscoCisco IOS XE Software17.9.6affected
CiscoCisco IOS XE Software17.17.1affected
CiscoCisco IOS XE Software17.16.1affected
CiscoCisco IOS XE Software17.15.1waffected
CiscoCisco IOS XE Software17.12.3aaffected
CiscoCisco IOS XE Software17.9.5caffected
CiscoCisco IOS XE Software17.15.1aaffected
CiscoCisco IOS XE Software17.12.1z1affected
CiscoCisco IOS XE Software17.15.2affected
CiscoCisco IOS XE Software17.15.1baffected
CiscoCisco IOS XE Software17.9.5daffected
CiscoCisco IOS XE Software17.15.1xaffected
CiscoCisco IOS XE Software17.9.6aaffected
CiscoCisco IOS XE Software17.12.1z2affected
CiscoCisco IOS XE Software17.6.8aaffected
CiscoCisco IOS XE Software17.16.1aaffected
CiscoCisco IOS XE Software16.12.13affected
CiscoCisco IOS XE Software17.15.3affected
CiscoCisco IOS XE Software17.9.7affected
CiscoCisco IOS XE Software17.12.5affected
CiscoCisco IOS XE Software17.15.1yaffected
CiscoCisco IOS XE Software17.9.5eaffected
CiscoCisco IOS XE Software17.12.4aaffected
CiscoCisco IOS XE Software17.15.2aaffected
CiscoCisco IOS XE Software17.15.2caffected
CiscoCisco IOS XE Software17.15.2baffected
CiscoCisco IOS XE Software17.12.1z3affected
CiscoCisco IOS XE Software17.9.5faffected
CiscoCisco IOS XE Software17.12.4baffected
CiscoCisco IOS XE Software17.12.5aaffected
CiscoCisco IOS XE Software17.18.1affected
CiscoCisco IOS XE Software17.12.6affected
CiscoCisco IOS XE Software17.12.1z4affected
CiscoCisco IOS XE Software17.9.8affected
CiscoCisco IOS XE Software17.9.7aaffected
CiscoCisco IOS XE Software17.15.3aaffected
CiscoCisco IOS XE Software17.15.4affected
CiscoCisco IOS XE Software17.12.5baffected
CiscoCisco IOS XE Software17.15.3baffected
CiscoCisco IOS XE Software16.12.14affected
CiscoCisco IOS XE Software17.18.1zaffected
CiscoCisco IOS XE Software17.9.7baffected
CiscoCisco IOS XE Software17.12.5caffected
CiscoCisco IOS XE Software26.1.1affected
CiscoCisco IOS XE Software17.18.1aaffected
CiscoCisco IOS XE Software17.15.4aaffected
CiscoCisco IOS XE Software17.18.2affected
CiscoCisco IOS XE Software17.18.1waffected
CiscoCisco IOS XE Software17.15.4baffected
CiscoCisco IOS XE Software17.12.6aaffected
CiscoCisco IOS XE Software17.12.7affected
CiscoCisco IOS XE Software17.15.4caffected
CiscoCisco IOS XE Software17.9.9affected
CiscoCisco IOS XE Software17.12.5daffected
CiscoCisco IOS XE Software16.12.15affected
CiscoCisco IOS XE Software17.15.4s1affected
CiscoCisco IOS XE Software17.15.5affected
CiscoCisco IOS XE Software17.12.1z5affected
CiscoCisco IOS XE Software17.18.1xaffected
CiscoCisco IOS XE Software17.12.1z6affected
CiscoCisco IOS XE Software17.15.4daffected
CiscoCisco IOS XE Software17.12.6baffected
CiscoCisco IOS XE Software17.4.1caffected
CiscoCisco IOS XE Software17.15.5aaffected
CiscoCisco IOS XE Software17.18.1yaffected
CiscoCisco IOS XE Software17.12.7aaffected
CiscoCisco IOS XE Software17.18.3affected
CiscoCisco IOS XE Software17.12.7baffected
CiscoCisco IOS XE Software17.18.3aaffected
CiscoCisco IOS XE Software26.1.1aaffected
CiscoCisco IOS XE Software17.15.7affected
CiscoCisco IOS XE Software16.12.16affected

Weaknesses

  • CWE-20: Improper Input Validation

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: partial

Additional References

References