How severe is CVE-2018-6811?

CVE-2018-6811 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2018-6811 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-6811?

CVE-2018-6811 primarily affects Citrix Netscaler Application Delivery Controller Firmware. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-6811?

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

When was CVE-2018-6811 published?

CVE-2018-6811 was published on 2018-03-06 and last updated on 2026-06-17.

CVE-2018-6811

CVE-2018-6811 is a medium-severity vulnerability in Citrix Netscaler Application Delivery Controller Firmware with a CVSS 3.x base score of 6.1. 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 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Citrix Netscaler Application Delivery Controller Firmware
Published: 2018-03-06
Last modified: 2026-06-17

Description

Multiple cross-site scripting (XSS) vulnerabilities in Citrix NetScaler ADC 10.5, 11.0, 11.1, and 12.0, and NetScaler Gateway 10.5, 11.0, 11.1, and 12.0 allow remote attackers to inject arbitrary web script or HTML via the Citrix NetScaler interface.

Frequently asked questions

What is CVE-2018-6811?: Multiple cross-site scripting (XSS) vulnerabilities in Citrix NetScaler ADC 10.5, 11.0, 11.1, and 12.0, and NetScaler Gateway 10.5, 11.0, 11.1, and 12.0 allow remote attackers to inject arbitrary web script or HTML via the Citrix NetScaler interface.
How severe is CVE-2018-6811?: CVE-2018-6811 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2018-6811 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-6811?: CVE-2018-6811 primarily affects Citrix Netscaler Application Delivery Controller Firmware. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-6811?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-6811 published?: CVE-2018-6811 was published on 2018-03-06 and last updated on 2026-06-17.

References

Affected products (8)

cpe:2.3:o:citrix:netscaler_application_delivery_controller_firmware:10.5:*:*:*:*:*:*:*
cpe:2.3:o:citrix:netscaler_application_delivery_controller_firmware:11.0:*:*:*:*:*:*:*
cpe:2.3:o:citrix:netscaler_application_delivery_controller_firmware:11.1:*:*:*:*:*:*:*
cpe:2.3:o:citrix:netscaler_application_delivery_controller_firmware:12.0:*:*:*:*:*:*:*
cpe:2.3:o:citrix:netscaler_gateway_firmware:10.5:*:*:*:*:*:*:*
cpe:2.3:o:citrix:netscaler_gateway_firmware:11.0:*:*:*:*:*:*:*
cpe:2.3:o:citrix:netscaler_gateway_firmware:11.1:*:*:*:*:*:*:*
cpe:2.3:o:citrix:netscaler_gateway_firmware:12.0:*:*:*:*:*:*:*

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