What Is CVE-2015-2387 (Microsoft ATM Font Driver Privilege Escalation)?

CVE-2015-2387 is a privilege escalation vulnerability in Microsoft ATM Font Driver. CISA added it to the Known Exploited Vulnerabilities catalogue on 3 March 2022, which means attackers have used it in real attacks. ATMFD.DLL in the Adobe Type Manager Font Driver in Microsoft Windows Server allows local users to gain privileges via a crafted application.

What the vulnerability is in practical terms

CVE-2015-2387 is a local privilege escalation flaw, so the main security issue is not remote compromise but the ability for an already local attacker to cross a trust boundary and gain stronger system rights. On Windows, that can turn a low-privilege foothold into control over the host.

Because CISA added the issue to the KEV catalogue, organisations should treat it as a confirmed exploitation risk rather than a theoretical code defect. For version and patch specifics, the vendor advisory and the CVE Program remain the authoritative references, with the NIST National Vulnerability Database useful for record lookups and tracking.

Why font driver privilege escalation is dangerous

Font parser and font-driver bugs are high-value because they sit in code paths that may be touched by ordinary user activity, document rendering, browser content, or application startup. When the vulnerable component runs in a privileged context, a crafted input can become a vehicle for privilege escalation instead of a simple application crash.

In practice, that means the attacker does not need to start with administrator access. A successful local exploit can be used to disable defenses, tamper with logs, dump secrets from memory, or stage additional payloads under elevated rights. The MITRE ATT&CK Enterprise Matrix is useful for mapping what attackers typically do after obtaining elevated local access.

How organisations check exposure and prioritise remediation

Exposure checking starts with asset inventory, endpoint visibility, and a fast answer to whether the affected Microsoft component is present on systems that matter. Because this is a KEV-listed issue, exposure review should also include whether the system is internet-facing, whether it is reachable by untrusted users, and whether the host is high value enough to justify emergency handling.

Use vendor advisories for version and patch decisions rather than trying to infer safety from the CVE title alone. The best operational pattern is to validate the affected software footprint, then prioritise systems that are externally reachable, privileged, or exposed to untrusted content. The Vulnerability Management Guide is a useful companion for KEV-driven prioritisation, exception handling, and verification.

Remediation, detection, and post-exploitation review

Patch as soon as practical, but when immediate remediation is not possible, reduce exposure by restricting local interactive access, limiting who can run untrusted applications, and increasing monitoring on high-value endpoints. Temporary controls do not remove the flaw, but they can narrow the chance that a local foothold becomes full host compromise.

After remediation, review whether the host showed signs of prior exploitation, because fixing the binary does not undo an established compromise. Look for unusual privilege changes, suspicious parent-child process chains, unexpected administrative actions, and signs that attackers used the elevated position to steal credentials or move laterally. If the system carried sensitive accounts or secrets, rotate any material that may have been exposed during the compromise window.

Risk and Threat Considerations

This kind of flaw is dangerous because local privilege escalation often serves as the bridge between initial access and durable control of a machine. Once an attacker gains elevated rights, they can disable protections, harvest credentials, and expand the compromise beyond the original user session.

Failure mechanism: A crafted application or input path triggers the vulnerable font driver in a way that lets a local attacker execute code with stronger privileges than intended.

Impact: The attacker can take over the host, access protected data, and use the machine as a stepping stone for persistence or lateral movement.

Standards & Framework Alignment

This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.

MITRE ATT&CK addresses the attack and risk surface, while NIST SP 800-53 Rev 5 and CIS Controls v8 set the governance and control requirements practitioners need to meet.

Framework	Control / Reference	Relevance
NIST SP 800-53 Rev 5	SI-2 — Flaw Remediation	This CVE requires timely vulnerability remediation across affected systems.
	SI-4 — System Monitoring	Post-exploit review needs monitoring for privilege escalation and follow-on activity.
	AC-6 — Least Privilege	Local privilege escalation directly defeats excessive local privilege.
Recommendation — Track, prioritize, and remediate the vulnerable component quickly. Monitor for suspicious process, privilege, and post-exploitation activity. Limit local privileges so compromise yields less authority.
CIS Controls v8	CIS-7 — Continuous Vulnerability Management	KEV-listed CVEs should be found, prioritized, and remediated quickly.
	CIS-8 — Audit Log Management	Privilege escalation requires detection and review of suspicious host activity.
Recommendation — Prioritize this exploit path in your vulnerability management workflow. Collect and review logs that reveal escalation and follow-on abuse.
MITRE ATT&CK	T1068 — Exploitation for Privilege Escalation	The vulnerability is explicitly a privilege escalation mechanism.
Recommendation — Map detections to privilege-escalation behavior and hunt for exploitation traces.

CVE-2015-2387 (Microsoft ATM Font Driver Privilege Escalation)