Cisco IOS XE up to 17.18.1x crlf injection

CVSS Meta Temp Score
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CTI Interest Score
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5.2$5k-$25k0.00

Summaryinfo

A vulnerability classified as problematic has been found in Cisco IOS XE. Affected by this vulnerability is an unknown functionality of the component Application Hosting Environment Management Interface. The manipulation leads to crlf injection. This vulnerability is uniquely identified as CVE-2026-20113. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Cisco IOS XE. It has been rated as problematic. This issue affects some unknown processing of the component Application Hosting Environment Management Interface. The manipulation with an unknown input leads to a crlf injection vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity. The summary by CVE is:

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.

The advisory is shared at sec.cloudapps.cisco.com. The identification of this vulnerability is CVE-2026-20113 since 10/08/2025. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 04/25/2026).

The vulnerability scanner Nessus provides a plugin with the ID 310105 (Cisco IOS XE Software IOx Application Hosting Environment CRLF Injection (cisco-sa-iox-crlf-NvgKTKJZ)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (310105) and EUVD (EUVD-2026-15443). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.2

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.3
CNA Vector (cisco): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Crlf injection
CWE: CWE-93 / CWE-74 / CWE-707
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 310105
Nessus Name: Cisco IOS XE Software IOx Application Hosting Environment CRLF Injection (cisco-sa-iox-crlf-NvgKTKJZ)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Timelineinfo

10/08/2025 CVE reserved
03/25/2026 +168 days Advisory disclosed
03/25/2026 +0 days VulDB entry created
04/25/2026 +30 days VulDB entry last update

Sourcesinfo

Vendor: cisco.com

Advisory: cisco-sa-iox-crlf-NvgKTKJZ
Status: Confirmed

CVE: CVE-2026-20113 (🔒)
GCVE (CVE): GCVE-0-2026-20113
GCVE (VulDB): GCVE-100-353177
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20150108

Entryinfo

Created: 03/25/2026 17:23
Updated: 04/25/2026 00:26
Changes: 03/25/2026 17:23 (65), 03/25/2026 18:17 (1), 03/31/2026 01:10 (1), 04/25/2026 00:26 (2)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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