Assessment
Why it matters
CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 30.0%; technical severity is CVSS 7.5.
Citrix StoreFront Server before 1903, 7.15 LTSR before CU4 (3.12.4000), and 7.6 LTSR before CU8 (3.0.8000) allows XXE attacks.
Who should care
- Teams operating StoreFront Server
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether StoreFront Server is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Citrix Security advisory CTX251988
- 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:N/A:N
- CWE
- CWE-611
- Affected versions
- Citrix StoreFront Server (Start Including 1811, End Excluding 1903 | End Excluding 3.12.4000 | End Excluding 3.0.8000)
- Fixed versions
- Citrix StoreFront Server (Fixed from 1903, 3.12.4000, 3.0.8000)
- Published
- 29 August 2019
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Added to CISA KEV
- Latest EPSS score: 30.0%
- Signal calculated at 77