Is CVE-2015-2360 (Microsoft Win32k Privilege Escalation) being exploited in the wild?

What “exploited in the wild” means for this CVE

For a CVE like this, “exploited in the wild” means there is confirmed real-world abuse, not just a proof of concept or theoretical risk. The most practical implication is that exposure should be treated as active until proven otherwise. For a Win32k privilege escalation, that means any local foothold can become a much more serious compromise if the vulnerable system is reachable and unpatched.

Because CISA added the issue to KEV, the operational question is no longer whether exploitation is possible, but whether the affected environment has been exposed long enough for an attacker or post-compromise payload to use it. In practice, teams should assume the vulnerability has intelligence value for threat actors as well as defenders.

Why Windows kernel privilege escalation is operationally serious

Win32k.sys sits in the Windows kernel path, so a privilege escalation flaw is not just a bug in one application layer. It can let a local attacker jump from limited code execution to a higher-privilege position on the same host, which can then be used for credential dumping, security tool tampering, persistence, or lateral movement. That is why local privilege escalation often becomes a force multiplier inside a broader intrusion.

If the weakness also allows denial-of-service, the impact is broader than account takeover. An attacker may use the flaw to destabilise a host even when privilege gain is not the immediate goal, which matters for endpoint availability, service continuity, and incident response containment.

How to respond when patching cannot happen immediately

When remediation must wait, the goal is to reduce the chance that an initial foothold can exploit the flaw and to limit what that foothold can reach. Prioritise systems with interactive users, internet-facing exposure, administrative workstations, and hosts that already show signs of suspicious activity. Tighten local admin rights, monitor for unusual parent-child process chains, and watch for attempts to disable security tools or access protected system areas.

If you need guidance on triage, validation, and emergency handling for actively exploited issues, use the Zero-Day and Exploited Vulnerabilities Guide as a practical response model, and consult the CISA Known Exploited Vulnerabilities Catalog for the authoritative exploitation status and required remediation window.

What to check after remediation

Once the vulnerable systems are patched or otherwise mitigated, validate whether the host was already used as an entry point. Check for new privileged accounts, suspicious scheduled tasks, unusual service creation, tampering with endpoint protection, and signs of kernel-level or SYSTEM-level execution shortly before remediation. If the host handled sensitive credentials, assume those secrets may need review even if the original exploit was “only” a privilege escalation.

Use the remediation window to decide whether adjacent controls also need hardening. A local privilege escalation becomes much more dangerous when endpoint monitoring is weak, when local admin rights are broad, or when the same host also stores privileged sessions, tokens, or management tools.

Risk and Threat Considerations

Actively exploited privilege-escalation flaws are attractive because they can turn a minor initial compromise into full host control with relatively little noise. On Windows, that often means the attacker does not need a new phishing path or a second exploit chain if they already have a foothold on the machine.

Failure mechanism: A local user or post-compromise payload abuses the kernel-mode flaw to run with elevated privileges, then uses that access to disable defenses, steal material, or stage lateral movement.

Impact: The compromised host can become a launch point for broader enterprise compromise, and on critical systems the flaw can also be used to interrupt service availability or interfere with recovery.

Practitioner Guidance

What to prioritise: Treat hosts with existing user execution, exposed administrative roles, or sensitive local tooling as highest priority, because a privilege escalation issue is most dangerous after an attacker already has a foothold.

What to verify: Confirm whether the affected Windows estate is covered by normal patch management, whether any systems are excluded from routine update cadence, and whether those exceptions are still justified. If a host is still vulnerable after the KEV listing, assume it is overdue for action.

Decision rule: If you cannot patch immediately, reduce blast radius first, isolate the most exposed systems, and perform compromise assessment before you rely on the machine as trustworthy again.

Practitioner takeaway: For KEV-listed privilege escalations, remediation is only half the task, because the other half is proving the host was not already turned into a higher-privilege foothold.

Related resources from NHI Mgmt Group

• Is CVE-2016-0165 (Microsoft Win32k Privilege Escalation) being exploited in the wild?
• CVE-2015-2360 (Microsoft Win32k Privilege Escalation)
• Is CVE-2014-1812 (Microsoft Windows Group Policy Preferences Password Privilege Escalation) being exploited in the wild?
• Is CVE-2021-31201 (Microsoft Enhanced Cryptographic Provider Privilege Escalation) being exploited in the wild?