How severe is CVE-2019-12668?

CVE-2019-12668 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2019-12668 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-12668?

CVE-2019-12668 primarily affects Cisco Ios. In total, 19 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-12668?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2019-12668 published?

CVE-2019-12668 was published on 2019-09-25 and last updated on 2026-06-17.

CVE-2019-12668

CVE-2019-12668 is a medium-severity vulnerability in Cisco Ios with a CVSS 3.x base score of 4.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 4.8)
CVSS v2: 3.5
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Cisco Ios
Published: 2019-09-25
Last modified: 2026-06-17

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.

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 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2019-12668 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-12668?: CVE-2019-12668 primarily affects Cisco Ios. In total, 19 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-12668?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-12668 published?: CVE-2019-12668 was published on 2019-09-25 and last updated on 2026-06-17.

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190925-sbxss

Affected products (19)

cpe:2.3:o:cisco:ios:15.2\(2\)e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)ea:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(3\)e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(3\)ea:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(4\)e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(4\)ea:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(4\)ec:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(5\)e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(5\)ea:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(5\)ex:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(6\)e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(7\)e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.6e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.7e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.8e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.9e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.10e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.1.1:*:*:*:*:*:*:*

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