Improper Handling of Extra Parameters in Cisco IOS XE - CVE-2026-20083
Published: March 25, 2026
Vulnerability identifier: #VU124591
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-20083
CWE-ID: CWE-235
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Cisco Systems, Inc
Affected software:
Cisco IOS XE
Cisco IOS XE
Detailed vulnerability description
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.
How to mitigate CVE-2026-20083
Install security update from vendor's website.