Assessment
Why it matters
CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 74.1%; technical severity is CVSS 8.8.
Citrix SD-WAN 10.2.x before 10.2.3 and NetScaler SD-WAN 10.0.x before 10.0.8 have Improper Input Validation (issue 5 of 6).
Who should care
- Teams operating Netscaler Sd-wan, Sd-wan, SD-WAN and NetScaler
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether Netscaler Sd-wan, Sd-wan, SD-WAN and NetScaler is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Citrix Security advisory CTX251987
- 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:L/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-78
- Affected versions
- Citrix Netscaler Sd-wan (Start Including 10.0.0, End Excluding 10.0.8); Citrix Sd-wan (Start Including 10.2.0, End Excluding 10.2.3); Citrix SD-WAN and NetScaler
- Fixed versions
- Citrix Netscaler Sd-wan (Fixed from 10.0.8); Citrix Sd-wan (Fixed from 10.2.3)
- Published
- 16 July 2019
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
Signal timeline
- CVE published
- Added to CISA KEV
- Latest EPSS score: 74.1%
- Signal calculated at 81