Improper Handling of Missing Values in Cisco IOS XE - CVE-2026-20086
Published: March 25, 2026
Vulnerability identifier: #VU124566
CSH Severity: High
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-20086
CWE-ID: CWE-230
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper handling of a malformed CAPWAP packet in the processing of CAPWAP packets when handling packets. A remote attacker can send a specially crafted request to cause a denial of service.
The affected device may reload unexpectedly, resulting in a denial of service condition.
Affected software
Cisco IOS XE
How to mitigate CVE-2026-20086
Install security update from vendor's website.
Cisco IOS XE - addressed in versions 17.15.5, 17.18.2