Cisco IOS XE Software Web UI Reflected Cross-Site Scripting Vulnerability

TL;DR 📌

A reflected cross-site scripting (XSS) vulnerability has been identified in the web UI of Cisco IOS XE Software. This flaw could allow unauthenticated remote attackers to execute malicious scripts on affected devices. Cisco has released software updates to address this issue, but no workarounds are available.

What happened 🕵️‍♂️

A vulnerability in the web UI of Cisco IOS XE Software has been discovered, allowing unauthenticated remote attackers to conduct reflected cross-site scripting (XSS) attacks. This vulnerability arises from improper sanitization of user-supplied input, enabling attackers to trick users into clicking malicious links. A successful exploit could allow attackers to steal user cookies from affected devices.

Affected products 🖥️

The vulnerability affects Cisco IOS XE Software when HTTP or HTTPS is enabled along with WebAuth. Devices with the HTTP Server feature enabled are at risk. For detailed information on vulnerable products, refer to the advisory.

Fixed software 🔧

Upgrade to the first fixed release in your train (or later):

Workarounds 🧯

There are no effective workarounds for this vulnerability. Disabling the HTTP Server feature can eliminate the attack vector temporarily. Users can limit exposure by allowing access only from trusted networks.

Risk in context 🎯

With a CVSS score of 6.1, this vulnerability is rated as Medium risk. The exposure is primarily driven by the potential for unauthenticated access via the web UI, which could lead to cookie theft. Immediate remediation is recommended through software updates.

Fast facts ⚡

• Vulnerability Type: Reflected Cross-Site Scripting (XSS)
• CVSS Score: 6.1 (Medium)
• Exploitation Potential: Proof-of-concept code is available, but no known malicious exploitation reported.
• Workarounds: None effective; disabling HTTP Server is a temporary measure.

For leadership 🧭

This vulnerability poses a Medium risk to your organization, with a CVSS score of 6.1. It is primarily exploitable through the web UI of affected devices, requiring no authentication, which increases exposure risk. Immediate action is advised to patch affected systems within 7 days, as no workarounds are available.

Operationally, applying the fix should involve a brief maintenance window with no expected configuration drift.

Now: Identify affected devices and initiate patching process.
Next: Monitor for any signs of exploitation and ensure network access controls are in place.
Later: Review security policies and user training to mitigate risks associated with social engineering attacks.