Assessment
Why it matters
CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 100.0%; technical severity is CVSS 9.8.
An issue was discovered in Citrix Application Delivery Controller (ADC) and Gateway 10.5, 11.1, 12.0, 12.1, and 13.0. They allow Directory Traversal.
Who should care
- Teams operating Application Delivery Controller (ADC), Gateway, and SD-WAN WANOP Appliance, Application Delivery Controller Firmware, Gateway Firmware +1 more
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether Application Delivery Controller (ADC), Gateway, and SD-WAN WANOP Appliance, Application Delivery Controller Firmware, Gateway Firmware +1 more is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Apply updates per vendor instructions.
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Vendor remediation
Patch and remediation links
Use the vendor source below to confirm the correct fixed version, package or mitigation for your affected product.
Technical details
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-22
- Affected versions
- Citrix Application Delivery Controller (ADC), Gateway, and SD-WAN WANOP Appliance; Citrix Application Delivery Controller Firmware (Version: 13.0); Citrix Gateway Firmware (Version: 13.0); Citrix Netscaler Gateway Firmware (Version: 12.1)
- Published
- 27 December 2019
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Added to CISA KEV
- Latest EPSS score: 100.0%
- Signal calculated at 88
External references
- Government advisory from www.cisa.gov
- Third-party advisory from packetstormsecurity.com
- Third-party advisory from packetstormsecurity.com
- Third-party advisory from packetstormsecurity.com
- Third-party advisory from packetstormsecurity.com
- Third-party advisory from packetstormsecurity.com
- Third-party advisory from forms.gle
- Vendor advisory from support.citrix.com
- Third-party advisory from twitter.com
- Government advisory from www.kb.cert.org