Assessment
Why it matters
CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 72.6%; technical severity is CVSS 9.8.
Citrix NetScaler SD-WAN devices through v9.1.2.26.561201 allow remote attackers to execute arbitrary shell commands as root via a CGISESSID cookie. On CloudBridge (the former name of NetScaler SD-WAN) devices, the cookie name was CAKEPHP rather than CGISESSID.
Who should care
- Teams operating Netscaler Sd-wan, NetScaler SD-WAN Enterprise, CloudBridge Virtual WAN, and XenMobile Server
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether Netscaler Sd-wan, NetScaler SD-WAN Enterprise, CloudBridge Virtual WAN, and XenMobile Server is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Citrix Security advisory CTX225990
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Treatment intelligence
Remediation intelligence
Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.
Verification noteAutomated link verification has not completed for this guidance yet.
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-20
- Affected versions
- Citrix Netscaler Sd-wan (End Including 9.1.2.26.561201); Citrix NetScaler SD-WAN Enterprise, CloudBridge Virtual WAN, and XenMobile Server
- Fixed versions
- No explicit fixed version is currently recorded.
- Published
- 20 July 2017
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Added to CISA KEV
- Latest EPSS score: 72.6%
- Signal calculated at 82