What happened

CISA added CVE-2018-0824 to the Known Exploited Vulnerabilities catalog on 2024-08-05, signaling confirmed exploitation in the wild and setting a remediation due date of 2024-08-26 CISA KEV. Microsoft Windows COM contains a deserialization of untrusted data flaw that can enable privilege escalation and remote code execution (RCE) when a user or process opens or runs a specially crafted file or script NVD entry. The CVE record attributes the weakness to CWE-502 (Deserialization of Untrusted Data), a class of bugs where attacker-controlled serialized content is rehydrated into objects that trigger unsafe behavior MITRE CVE record.

Why it matters

CISA’s KEV inclusion means active exploitation—not theoretical risk—so programs that prioritize KEV items should move this Windows issue to the front of the queue for patch or mitigation CISA KEV. Deserialization flaws are high-impact because they can convert passive content into code execution by abusing object graphs and gadget chains, frequently crossing privilege or trust boundaries NVD entry. Windows COM is a foundational inter-process component model, so a vulnerability here can affect a broad surface where files, scripts, or automation invoke COM objects during normal workflows MITRE CVE record.

Technical detail

CVE-2018-0824 is categorized under CWE-502, indicating that Windows COM deserializes untrusted data in a way that may instantiate or invoke dangerous behaviors from attacker-supplied content NVD entry. In practice, a crafted file or script can carry a serialized payload or parameters which, when processed by the vulnerable COM handling path, cause execution in the context of the consuming process MITRE CVE record. CWE-502 generally warns that deserialization should not occur on data from untrusted sources because gadget chains can be abused to run methods with security-relevant side effects CWE-502.

The attack surface includes scenarios where Windows or an application leverages COM and, during object activation or state restoration, accepts externally controlled input that is not properly constrained NVD entry. According to the CVE description, a successful exploit can yield local privilege escalation or full remote code execution if an attacker convinces a target to open or execute malicious content that triggers the vulnerable COM deserialization path MITRE CVE record. Because COM is ubiquitous across Windows automation and scripting, the vulnerable vector can be reached via files or scripts, expanding the delivery options for threat actors CISA KEV.

This is a content-triggered vulnerability class: the exploit lives inside crafted input, not necessarily in a persistent binary, which complicates static defenses and favors delivery via documents, scripts, or other serialized carriers CWE-502. The KEV flag confirms attackers are already leveraging this pathway, raising the risk that commodity loaders or hands-on-keyboard operators chain it for initial footholds or local elevation depending on the target workflow CISA KEV.

Defense

CISA requires organizations to apply mitigations per vendor instructions or discontinue use where mitigations are unavailable, with a remediation due date of 2024-08-26 for this CVE CISA KEV. Prioritize this KEV item in vulnerability management pipelines and ensure Windows assets that expose COM-driven workflows are patched or otherwise mitigated rapidly CISA KEV. Treat any deserialization pathway as untrusted until verified remediated, given the CWE-502 risk of gadget-based code execution from attacker-controlled input CWE-502.

Control exposure by minimizing opportunities for untrusted files or scripts to invoke sensitive COM operations while remediation completes, consistent with the CVE’s file/script-driven exploit description NVD entry. Elevate logging and alerting on workflows where user-acquired content is processed by automation or scripting that interacts with COM, since exploitation hinges on crafted inputs traversing COM deserialization paths MITRE CVE record. Incorporate KEV-based SLAs into patch governance to ensure exploited vulnerabilities are addressed within mandated timelines across Windows fleets CISA KEV.

Lyrie Verdict

Content-triggered vulnerabilities like CVE-2018-0824 are exactly where autonomous, machine-speed defense pays off: detection hinges on recognizing malicious serialized input before or as it hits a COM deserialization path, not after hands-on compromise CWE-502. Lyrie sensors should auto-correlate inbound content, script execution, and COM invocation to flag the specific “crafted file/script → COM deserialize” sequence described for this CVE, closing the gap implied by CISA’s active exploitation notice NVD entry. We treat KEV flags as hard prioritization signals and enforce machine-speed interdiction—quarantining suspect content and terminating risky deserialization flows on Windows endpoints before privilege escalation or RCE can complete CISA KEV.