CVE-2026-20113
Received Received - Intake
CRLF Injection in Cisco IOS XE IOx Management Interface

Publication date: 2026-03-25

Last updated on: 2026-03-25

Assigner: Cisco Systems, Inc.

Description
A vulnerability in the web-based Cisco IOx application hosting environment management interface of Cisco IOS XE Software could allow an unauthenticated, remote attacker to perform a carriage return line feed (CRLF) injection attack against a user. This vulnerability is due to insufficient validation of user input. An attacker could exploit this vulnerability by sending crafted packets to an affected device. A successful exploit could allow the attacker to arbitrarily inject log entries, manipulate the structure of log files, or obscure legitimate log events.
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Meta Information
Published
2026-03-25
Last Modified
2026-03-25
Generated
2026-06-16
AI Q&A
2026-03-25
EPSS Evaluated
2026-06-15
NVD
CVE-2026-20113
EUVD
EUVD-2026-15443
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
cisco ios_xe *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-93 The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.
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Executive Summary

This vulnerability exists in the web-based Cisco IOx application hosting environment management interface of Cisco IOS XE Software. It allows an unauthenticated, remote attacker to perform a carriage return line feed (CRLF) injection attack against a user.

The root cause is insufficient validation of user input. An attacker can exploit this by sending specially crafted packets to the affected device.

If successfully exploited, the attacker can arbitrarily inject log entries, manipulate the structure of log files, or obscure legitimate log events.

Impact Analysis

This vulnerability can impact you by allowing an attacker to inject false or misleading information into log files.

Such manipulation can obscure legitimate log events, making it difficult to detect malicious activity or troubleshoot issues.

This could lead to compromised system monitoring and incident response, potentially allowing attackers to hide their presence or actions.

Compliance Impact

The provided information does not specify how this vulnerability directly affects compliance with common standards and regulations such as GDPR or HIPAA.

Detection Guidance

This vulnerability affects Cisco devices running vulnerable Cisco IOS XE Software releases configured with the IOx application hosting environment, which is not enabled by default.

To detect if your device is potentially vulnerable, you can verify the presence of IOx by running the following command in privileged EXEC mode:

  • show run | include iox

If the output contains "iox," the device is vulnerable to this CRLF injection vulnerability.

Mitigation Strategies

There are no workarounds available for this vulnerability.

Cisco strongly recommends upgrading to fixed software releases to fully remediate the issue.

Customers should obtain fixed software from Cisco or authorized partners and ensure device compatibility with new releases.

Additionally, Cisco provides the Cisco Software Checker tool to help identify affected software versions and the earliest fixed releases.

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