Improper Handling of Extra Parameters in Cisco IOS XE - CVE-2026-20083
Published: March 25, 2026
Vulnerability identifier: #VU124591
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-20083
CWE-ID: CWE-235
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper handling of a malformed SCP request in the Secure Copy Protocol (SCP) server feature when processing SCP commands over SSH. A local user can send a specially crafted SCP command to cause the device to reload unexpectedly, resulting in a denial of service.
Successful exploitation requires the attacker to be authenticated with low privileges and the SCP server feature to be enabled on the device.
Affected software
Cisco IOS XE
How to mitigate CVE-2026-20083
Install security update from vendor's website.
Cisco IOS XE - update to 17.15.5