High‑Severity Privilege Escalation in Microsoft Windows UPnP Service (CVE‑2019‑1405)
What It Is
A privilege‑escalation flaw exists in the Windows Universal Plug and Play (UPnP) service. The service improperly permits creation of a COM object, allowing an attacker to elevate from a standard user to SYSTEM‑level privileges.
Exploitability
- CVSS v3.1 base score: 7.8 (High).
- Public proof‑of‑concept code has been released; no confirmed widespread active exploitation, but the attack path is straightforward once the service is reachable.
- The vulnerability is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, indicating a credible threat landscape.
Affected Products
- Microsoft Windows (all supported editions that include the UPnP service).
- The issue is present when the UPnP service is enabled, which is the default configuration on many Windows installations.
Why It Matters for Compliance & Audit Readiness
Privilege‑escalation weaknesses directly challenge access‑control and privileged‑account management controls required by frameworks such as NIST CSF, ISO 27001, and PCI‑DSS. Demonstrating that you have:
- Continuous control monitoring – evidence that UPnP is disabled or patched across the environment.
- Defensible audit trails – documented patch‑management tickets, configuration baselines, and verification logs.
These artifacts satisfy audit expectations for “least privilege” and “secure configuration” controls, reducing the risk of non‑compliance findings.
Recommended Actions
- Deploy Microsoft security update KB 4528760 (or later) that resolves CVE‑2019‑1405.
- If UPnP is not required for business functions, disable the service via Group Policy or local security settings.
- Verify remediation status with an automated inventory tool (e.g., SCCM, Intune) and capture screenshots or logs as evidence.
- Map the remediation to your privileged‑access control (P‑AC) policy and update the control‑mapping matrix in your Trust Center.
- Document the change in your continuous monitoring dashboard to maintain a defensible audit trail.
Source: https://nvd.nist.gov/vuln/detail/CVE-2019-1405