CVE-2018-8298 is a type confusion vulnerability in ChakraCore ChakraCore scripting engine. CISA added it to the Known Exploited Vulnerabilities catalogue on 3 March 2022, which means attackers have used it in real attacks. The ChakraCore scripting engine contains a type confusion vulnerability which can allow for remote code execution.
How this vulnerability class works
A type confusion flaw in a scripting engine means the runtime can misread one kind of object as another. In a browser or embedded engine, that can break memory safety and let malicious script influence reads, writes, or control flow in ways the engine never intended.
That matters because scripting engines sit on a path attackers can reach remotely through content, and a type confusion bug can become a reliable code execution primitive once a crafted payload hits the right execution state. For practical vulnerability tracking, readers should treat the CVE record and the CVE Program as the identifier source, then use the vendor advisory and the NIST National Vulnerability Database for exposure and reference details.
Why this is dangerous in a scripting engine
Scripting engines are exposed to untrusted input by design, so a memory corruption issue in that layer can be reached without local access. When the flaw can be turned into remote code execution, the security boundary is not just the application, but the entire trust model around rendered or executed content.
In practice, that can lead to full compromise of the hosting process, follow-on theft of tokens or cached data, and lateral movement if the process has broader permissions than it should. The danger is amplified when the engine is embedded in software that users routinely open from untrusted sources, because exploitation can happen before the user recognises anything is wrong.
How organisations assess exposure and reduce blast radius
Exposure checks should start with asset inventory, product usage, and whether the affected engine is present in internet-facing or user-reachable systems. Because KEV inclusion means real-world exploitation has already occurred, teams should prioritise systems that are externally exposed, hard to patch quickly, or embedded in higher-value workflows.
Where patching is delayed, compensating controls matter: reduce reachable attack surface, limit untrusted content execution paths, and isolate the affected software so a successful exploit cannot easily become a wider environment compromise. For a broader process view on triage, validation, and remediation sequencing, Vulnerability Management Guide is the most relevant internal reference in the supplied pool.
Detection and post-exploitation review
Detection for exploited engine flaws should focus on signs of abnormal process behaviour rather than the CVE name alone. That includes unexpected child processes, script engine crashes followed by restart loops, suspicious network callbacks, or changes in files, registry settings, or memory state that indicate the exploit moved beyond the initial crash.
After patching, organisations should still review for post-compromise activity, because exploitation may have already delivered code execution before remediation. A useful external baseline for broader attack-path thinking is the MITRE ATT&CK Enterprise Matrix, which helps map what an attacker typically does after gaining execution.
Risk and Threat Considerations
This kind of vulnerability is especially risky because a memory-safety bug in a widely reachable scripting engine can convert ordinary content execution into full process compromise. Once exploited, the attacker may be able to run arbitrary code, stage payloads, and persist through whatever trust the host application has already earned.
Failure mechanism: Type confusion lets an attacker steer the engine into treating one object layout as another, which can corrupt memory or redirect execution.
Impact: The result can be remote code execution, follow-on credential or session theft, and broader compromise of the host system or nearby services.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
CIS Controls v8, NIST SP 800-53 Rev 5 and NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | CIS-7 — Continuous Vulnerability Management | CVE exploitation requires continuous identification and prioritisation of vulnerable assets. |
| Recommendation — Prioritise and remediate the affected engine quickly using a risk-based vulnerability process. | ||
| NIST SP 800-53 Rev 5 | SI-2 — Flaw Remediation | This CVE is a remediable software flaw with known exploitation. |
| SI-4 — System Monitoring | Post-exploit detection depends on monitoring for abnormal process and execution behaviour. | |
| RA-5 — Vulnerability Monitoring and Scanning | Exposure assessment depends on finding where the affected engine is deployed. | |
| Recommendation — Track the vulnerable software and apply vendor remediation as soon as it is available. Monitor host and application telemetry for signs of exploitation and suspicious execution. Scan and inventory systems to confirm where the vulnerable engine exists and how exposed it is. | ||
| NIST CSF 2.0 | ID.RA-01 — Asset Vulnerability Identification | The subject requires identifying vulnerable assets and their exposure status. |
| Recommendation — Identify systems running the affected engine and rank them by exposure and business criticality. | ||
Practitioner Guidance
Why practitioners should care: Treat KEV-listed engine flaws as active exposure, not theoretical product defects. The right decision is usually to verify presence quickly, prioritise externally reachable instances, and reduce exposure until the vendor fix is in place.
What to watch for: If you cannot patch immediately, watch for crashes, unusual child processes, and any post-exploit indicators that suggest the engine executed attacker-controlled code before remediation.