CVE-2026-20113: Improper Neutralization of CRLF Sequences ('CRLF Injection') in Cisco Cisco IOS XE Software
CVE-2026-20113 is a medium severity vulnerability in Cisco IOS XE Software's web-based IOx application hosting environment management interface. It allows an unauthenticated remote attacker to perform a CRLF injection attack by sending crafted packets. This vulnerability arises from insufficient validation of user input. Successful exploitation can enable attackers to inject arbitrary log entries, manipulate log file structure, or obscure legitimate log events. There is no indication of impact on confidentiality or availability. No known exploits are reported in the wild. Patch status is not confirmed from the provided data.
AI Analysis
Technical Summary
This vulnerability in Cisco IOS XE Software affects the web-based IOx application hosting environment management interface. Due to improper neutralization of CRLF sequences in user input, an unauthenticated remote attacker can inject carriage return and line feed characters. This can be exploited by sending crafted packets to the device, resulting in arbitrary injection of log entries, manipulation of log file structure, or obscuring legitimate log events. The CVSS v3.1 base score is 5.3 (medium severity), reflecting no impact on confidentiality or availability but limited impact on integrity.
Potential Impact
The vulnerability allows an attacker to alter log files by injecting arbitrary entries or modifying the log structure, potentially obscuring legitimate events. This can hinder forensic analysis and incident response but does not directly compromise confidentiality or availability of the device or data.
Mitigation Recommendations
Patch status is not yet confirmed — check the Cisco vendor advisory for current remediation guidance. Until a patch or official fix is available, monitor Cisco advisories for updates. No specific mitigations are provided in the current data.
CVE-2026-20113: Improper Neutralization of CRLF Sequences ('CRLF Injection') in Cisco Cisco IOS XE Software
Description
CVE-2026-20113 is a medium severity vulnerability in Cisco IOS XE Software's web-based IOx application hosting environment management interface. It allows an unauthenticated remote attacker to perform a CRLF injection attack by sending crafted packets. This vulnerability arises from insufficient validation of user input. Successful exploitation can enable attackers to inject arbitrary log entries, manipulate log file structure, or obscure legitimate log events. There is no indication of impact on confidentiality or availability. No known exploits are reported in the wild. Patch status is not confirmed from the provided data.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Cisco IOS XE Software affects the web-based IOx application hosting environment management interface. Due to improper neutralization of CRLF sequences in user input, an unauthenticated remote attacker can inject carriage return and line feed characters. This can be exploited by sending crafted packets to the device, resulting in arbitrary injection of log entries, manipulation of log file structure, or obscuring legitimate log events. The CVSS v3.1 base score is 5.3 (medium severity), reflecting no impact on confidentiality or availability but limited impact on integrity.
Potential Impact
The vulnerability allows an attacker to alter log files by injecting arbitrary entries or modifying the log structure, potentially obscuring legitimate events. This can hinder forensic analysis and incident response but does not directly compromise confidentiality or availability of the device or data.
Mitigation Recommendations
Patch status is not yet confirmed — check the Cisco vendor advisory for current remediation guidance. Until a patch or official fix is available, monitor Cisco advisories for updates. No specific mitigations are provided in the current data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- cisco
- Date Reserved
- 2025-10-08T11:59:15.375Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 69c40a67f4197a8e3b699a42
Added to database: 3/25/2026, 4:16:39 PM
Last enriched: 4/3/2026, 1:38:03 PM
Last updated: 5/9/2026, 10:20:15 PM
Views: 53
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