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CVE-2016-9676 Citrix CVE debrief

CVE-2016-9676 is a critical buffer overflow affecting Citrix Provisioning Services. The NVD record and Citrix vendor advisory indicate that versions before 7.12 are affected, with vulnerable CPEs listed for 7.0, 7.1, 7.6, 7.7, 7.8, 7.9, and 7.11. The issue is rated CVSS 9.8 with a network attack vector and no privileges or user interaction required, so exposed deployments should be treated as urgent patch candidates.

Vendor
Citrix
Product
CVE-2016-9676
CVSS
CRITICAL 9.8
CISA KEV
Not listed in stored evidence
Original CVE published
2017-01-18
Original CVE updated
2026-05-13
Advisory published
2017-01-18
Advisory updated
2026-05-13

Who should care

Organizations running Citrix Provisioning Services, especially any internet-reachable or broadly accessible management environments, should prioritize this immediately. Security teams, virtualization and endpoint infrastructure administrators, and vulnerability management teams should confirm whether any listed affected versions are deployed and update them as soon as possible.

Technical summary

The vulnerability is described as a buffer overflow in Citrix Provisioning Services, mapped to CWE-119. NVD assigns CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating that a remote attacker could potentially achieve full confidentiality, integrity, and availability impact without authentication or user interaction. The record references Citrix support guidance and third-party advisories, and identifies affected product versions in the 7.x line up to 7.11.

Defensive priority

Immediate. This is a critical remote code execution risk with no required privileges or user interaction, so affected systems should be patched or otherwise removed from exposure as quickly as operationally possible.

Recommended defensive actions

  • Identify all Citrix Provisioning Services deployments and verify exact versions against the affected CPE list and vendor guidance.
  • Upgrade affected installations to a fixed release; the description states the issue is addressed before 7.12.
  • Prioritize systems that are reachable from untrusted networks or that support high-value infrastructure.
  • Review Citrix vendor advisory CTX219580 for remediation guidance and any product-specific instructions.
  • Use standard compensating controls until remediation is complete, such as limiting management-plane access and monitoring for unusual service behavior.
  • After remediation, validate the installed version and document the upgrade in vulnerability management records.

Evidence notes

Source evidence is limited to the supplied NVD record, CVE record metadata, and linked advisory references. The record states a buffer overflow in Citrix Provisioning Services before 7.12, lists affected versions 7.0, 7.1, 7.6 through 7.9, and 7.11, and maps the weakness to CWE-119. CVSS vector and severity are taken from the NVD metadata provided in the corpus.

Official resources

The CVE record was published on 2017-01-18 and later modified on 2026-05-13. This debrief uses the CVE publication date for issue timing and treats the later modified date only as record maintenance context.