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CVE-2018-6809

32
FAUCET Score

CVE-2018-6809 is a critical vulnerability affecting NetScaler ADC and NetScaler Gateway versions 10.5, 11.0, 11.1, and 12.0. This flaw allows unauthenticated remote attackers to gain elevated privileges on the target system. With a CVSS score of 9.8, it presents a severe risk due to its network-based attack vector, low attack complexity, and complete compromise of confidentiality, integrity, and availability. While there is no known active exploitation, public exploit code, or KEV entry, the vulnerability has garnered significant community discussion, indicating awareness of its potential impact.

Impacted Technologies

VendorProductVersion(s)CPE
10.5CPE matchmatch criteria
cpe:2.3:o:citrix:netscaler_application_delivery_controller_firmware:10.5:*:*:*:*:*:*:*
11.0CPE matchmatch criteria
cpe:2.3:o:citrix:netscaler_application_delivery_controller_firmware:11.0:*:*:*:*:*:*:*
11.1CPE matchmatch criteria
cpe:2.3:o:citrix:netscaler_application_delivery_controller_firmware:11.1:*:*:*:*:*:*:*
12.0CPE matchmatch criteria
cpe:2.3:o:citrix:netscaler_application_delivery_controller_firmware:12.0:*:*:*:*:*:*:*
10.5CPE matchmatch criteria
cpe:2.3:o:citrix:netscaler_gateway_firmware:10.5:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.22%
Probability of exploitation in next 30 days
EPSS Percentile
90.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0422 is in the 83rd percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

citrixvendor investigatingvia nvd_reference
View patch

References

support.citrix.com / article/CTX232161
Vendor Advisory
securitytracker.com / id/1040440
Third Party AdvisoryVDB Entry