CRLF injection in Cisco IOS XE - CVE-2026-20113
Published: March 25, 2026
Vulnerability identifier: #VU124594
CSH Severity: Medium
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-20113
CWE-ID: CWE-93
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to inject arbitrary log entries, manipulate the structure of log files, or obscure legitimate log events.
The vulnerability exists due to improper input validation in the web-based Cisco IOx application hosting environment management interface when handling user-supplied input. A remote attacker can send a specially crafted request to inject CRLF sequences and manipulate log entries.
The Cisco IOx application hosting environment must be configured on the device for the vulnerability to be exploitable. The feature is not enabled by default.
Affected software
Cisco IOS XE
How to mitigate CVE-2026-20113
Install security update from vendor's website.
Cisco IOS XE - addressed in versions 17.15.5, 17.18.2