CVE-2019-12668: 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 cro...

Description

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.

Metrics

CVSS 3.1

4.8/10

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.80%

52.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Cisco	Ios	15.2\(2\)e
Cisco	Ios	15.2\(2\)ea
Cisco	Ios	15.2\(3\)e
Cisco	Ios	15.2\(3\)ea
Cisco	Ios	15.2\(4\)e
Cisco	Ios	15.2\(4\)ea
Cisco	Ios	15.2\(4\)ec
Cisco	Ios	15.2\(5\)e
Cisco	Ios	15.2\(5\)ea
Cisco	Ios	15.2\(5\)ex
Cisco	Ios	15.2\(6\)e
Cisco	Ios	15.2\(7\)e
Cisco	Ios Xe	>= 16.1.1, < 16.3.8
Cisco	Ios Xe	>= 16.4.1, < 16.6.5
Cisco	Ios Xe	>= 16.7.1, < 16.8.2
Cisco	Ios Xe	>= 16.9.1, < 16.9.2
Cisco	Ios Xe	3.6e
Cisco	Ios Xe	3.7e
Cisco	Ios Xe	3.8e
Cisco	Ios Xe	3.9e
Cisco	Ios Xe	3.10e
Cisco	Ios Xe	16.1.1

References

Timeline

Published: Sep 25, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-12668?

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.

How severe is CVE-2019-12668?

CVE-2019-12668 has a CVSS score of 4.8/10 (MEDIUM severity). The EPSS model estimates a 0.80% probability of exploitation in the next 30 days.

How do I fix CVE-2019-12668?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.