Medium5.3Cisco

Medium [CVE-2026-20113] Cisco IOx Application Hosting Environment Carriage Return Line Feed Injection Vulnerability

This medium-severity Cisco advisory covers CVE-2026-20113 affecting Cisco IOS XE Software 16.6.1, Cisco IOS XE Software 16.6.2, Cisco IOS XE Software 16.6.3.

cisco-sa-iox-crlf-NvgKTKJZ Published Mar 25, 2026Updated by vendor Mar 25, 2026

CVE-2026-20113

Affected products & platforms

CiscoIOS XE

Open vendor advisory

Android app · Google Play

Monitor future Cisco CVEs from your phone.

Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 32 official vendor sources and 160+ reviewed platform categories.

Matching phone alertsOptional email delivery

Get CVE alerts See app features

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 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 upda…

Affected products named by the advisory: Cisco IOS XE Software 16.6.1; Cisco IOS XE Software 16.6.2; Cisco IOS XE Software 16.6.3; Cisco IOS XE Software 16.6.4s; and 2 more.

Affected versions

Scope: At the time of publication, this vulnerability affected Cisco devices if they were running a vulnerable release of Cisco IOS XE Software that was configured for the Cisco IOx application hosting environment. The Cisco IOx application hosting environment is not configured by default.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Workaround status

There are no workarounds that address this vulnerability.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Cisco Security Advisories (PSIRT)official
Official vendor feed — the source of truth for this advisory. VulniPulse polled this feed and parsed this entry from it. Discovered from the machine-readable feed https://sec.cloudapps.cisco.com/security/center/psirtrss20/CiscoSecurityAdvisory.xml; this link opens the Cisco advisory index instead of the raw feed document.
Cisco
Vendor advisory pageofficial
Advisory page fetched and parsed to extract affected/fixed versions and mitigation guidance beyond what the feed carries.
Cisco

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-20113NVD CVE.org MITRE

Official resources

Cisco Software Checker
Official documentation
Official tool to confirm whether your exact IOS / IOS XE / NX-OS / ASA / FTD / SD-WAN release is affected and to find the first fixed release.

Discussion(0)

No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.