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4.8

Cisco IOS/IOS XE web UI can store malicious banner

CVE-2019-12668 · published 7 years ago
Summary

If someone with login rights to a Cisco IOS or IOS XE device saves a specially crafted banner, the banner can contain hidden code that runs later when another user opens the device's web management page. This could let the attacker see or control information in the user's web browser. Apply the latest software update from Cisco or disable the banner feature to stop the problem.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
cisco ios 15.2\(2\)e
15.2\(2\)ea
15.2\(3\)e
15.2\(3\)ea
15.2\(4\)e
15.2\(4\)ea
15.2\(4\)ec
15.2\(5\)e
15.2\(5\)ea
15.2\(5\)ex
15.2\(6\)e
15.2\(7\)e
cpe:2.3:o:cisco:ios:15.2\(2\)e:*:*:*:*:*:*:*
cisco ios_xe >= 16.1.1, < 16.3.8
>= 16.4.1, < 16.6.5
>= 16.7.1, < 16.8.2
>= 16.9.1, < 16.9.2
3.6e
3.7e
3.8e
3.9e
3.10e
16.1.1
cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*
Original advisory text
A vulnerability in the web framework code of Cisco IOS and Cisco IOS XE Software could allow an authenticated, remote attacker to conduct a stored cross-site scripting (XSS) attack against a user o...
A vulnerability in the web framework code of Cisco IOS and Cisco IOS XE Software could allow an authenticated, remote attacker to conduct a stored cross-site scripting (XSS) attack against a user of the web interface of the affected software using the banner parameter. The vulnerability is due to insufficient input validation of the banner parameters that are passed to the web server of the affected software. An attacker could exploit this vulnerability by crafting a banner parameter and saving it. The attacker could then convince a user of the web interface to access a malicious link or could intercept a user request for the affected web interface and inject malicious code into the request. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected web interface or allow the attacker to access sensitive browser-based information.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
4.8 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-79Cross-site Scripting (XSS)
Timeline
Published25 Sep 2019
Updated4 Nov 2026
First seen29 Sep 2026
Sources
CVE-2019-12668 · NVD
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