---
id: CVE-2026-20113
title: >-
  Cisco IOx Application Hosting Environment Carriage Return Line Feed (CRLF)
  Injection Vulnerability
summary: >-
  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…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'
cvssSource: vendor
vendor: Cisco
product: Cisco IOS XE Software
affected:
  - ios_xe_software 16.6.1
  - ios_xe_software 16.7.1
  - ios_xe_software 16.8.1
  - ios_xe_software 16.9.1
  - ios_xe_software 16.10.1
  - ios_xe_software 16.11.1
  - ios_xe_software 16.12.1
  - ios_xe_software 16.6.2
  - ios_xe_software 16.7.1a
  - ios_xe_software 16.6.3
  - ios_xe_software 16.9.2
  - ios_xe_software 16.7.1b
  - ios_xe_software 16.6.4
  - ios_xe_software 16.8.1a
  - ios_xe_software 16.8.1b
  - ios_xe_software 16.8.1s
  - ios_xe_software 16.7.2
  - ios_xe_software 16.8.1c
  - ios_xe_software 16.6.5
  - ios_xe_software 16.9.1a
  - ios_xe_software 16.8.1d
  - ios_xe_software 16.9.1b
  - ios_xe_software 16.7.3
  - ios_xe_software 16.8.2
  - ios_xe_software 16.9.1s
  - ios_xe_software 16.6.4s
  - ios_xe_software 16.9.1c
  - ios_xe_software 17.1.1
  - ios_xe_software 16.6.4a
  - ios_xe_software 16.9.1d
  - ios_xe_software 16.8.1e
  - ios_xe_software 16.10.1a
  - ios_xe_software 16.9.3
  - ios_xe_software 16.9.2a
  - ios_xe_software 17.2.1
  - ios_xe_software 16.10.1b
  - ios_xe_software 16.6.5a
  - ios_xe_software 16.11.1a
  - ios_xe_software 16.9.2s
  - ios_xe_software 16.10.1s
published: '2026-03-25'
updated: '2026-03-25'
sourceUpdated: '2026-03-25T16:00:00+00:00'
source: CSAF
sourceUrl: >-
  https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iox-crlf-NvgKTKJZ
references:
  - url: >-
      https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iox-crlf-NvgKTKJZ
  - url: 'https://software.cisco.com'
tags:
  - csaf
  - vendor-advisory
  - cisco
epss: 0.0029
epssPercentile: 0.20043
ingestedAt: '2026-10-15T11:50:11.862Z'
---

## Overview

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.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.



This advisory is part of the March 2026 release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: March 2026 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication ["https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75297"].

## Vendor advisories

- **cisco-sa-iox-crlf-NvgKTKJZ** · Cisco · affected: Cisco IOS XE Software (250 versions) · updated 2026-03-25 · [advisory](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iox-crlf-NvgKTKJZ)

**Cisco IOx Application Hosting Environment Carriage Return Line Feed Injection Vulnerability**. Released 2026-03-25.

Affected:

- Cisco IOS XE Software 16.6.1
- Cisco IOS XE Software 16.7.1
- Cisco IOS XE Software 16.8.1
- Cisco IOS XE Software 16.9.1
- Cisco IOS XE Software 16.10.1
- Cisco IOS XE Software 16.11.1
- Cisco IOS XE Software 16.12.1
- Cisco IOS XE Software 16.6.2
- Cisco IOS XE Software 16.7.1a
- Cisco IOS XE Software 16.6.3
- Cisco IOS XE Software 16.9.2
- Cisco IOS XE Software 16.7.1b
- Cisco IOS XE Software 16.6.4
- Cisco IOS XE Software 16.8.1a
- Cisco IOS XE Software 16.8.1b
- Cisco IOS XE Software 16.8.1s
- Cisco IOS XE Software 16.7.2
- Cisco IOS XE Software 16.8.1c
- Cisco IOS XE Software 16.6.5
- Cisco IOS XE Software 16.9.1a
- Cisco IOS XE Software 16.8.1d
- Cisco IOS XE Software 16.9.1b
- Cisco IOS XE Software 16.7.3
- Cisco IOS XE Software 16.8.2
- Cisco IOS XE Software 16.9.1s
- Cisco IOS XE Software 16.6.4s
- Cisco IOS XE Software 16.9.1c
- Cisco IOS XE Software 17.1.1
- Cisco IOS XE Software 16.6.4a
- Cisco IOS XE Software 16.9.1d
- Cisco IOS XE Software 16.8.1e
- Cisco IOS XE Software 16.10.1a
- Cisco IOS XE Software 16.9.3
- Cisco IOS XE Software 16.9.2a
- Cisco IOS XE Software 17.2.1
- Cisco IOS XE Software 16.10.1b
- Cisco IOS XE Software 16.6.5a
- Cisco IOS XE Software 16.11.1a
- Cisco IOS XE Software 16.9.2s
- Cisco IOS XE Software 16.10.1s

## Remediation

Cisco has released software updates that address this vulnerability. https://software.cisco.com