Yes. CISA added CVE-2016-4117 to its Known Exploited Vulnerabilities catalogue on 3 March 2022, which it does only when there is reliable evidence of active exploitation. CISA lists it as known to be used in ransomware campaigns. An access of resource using incompatible type vulnerability exists within Adobe Flash Player that allows an attacker to perform remote code execution.
What “exploited in the wild” means for this CVE
For a CVE like this, the practical question is not whether the flaw exists in isolation, but whether there is credible evidence that attackers are already using it against real systems. When CISA places a vulnerability in the Known Exploited Vulnerabilities Catalog, that is a strong signal that exploitation is real, not theoretical, and that response should move from planning to action.
That matters because actively exploited vulnerabilities behave differently from ordinary disclosure items. They can be weaponised quickly, appear in chained attacks, and remain attractive to opportunistic actors even after patches exist, especially where legacy software is still present.
How to confirm whether you are exposed
The first step is to determine whether Adobe Flash Player is still present anywhere in the environment, including desktops, virtual images, old browsers, packaged enterprise apps, and systems that were never fully rebuilt after Flash’s end-of-life. A vulnerability can be “historic” and still matter if the software survives in a forgotten image or a long-lived endpoint.
For version and product details, use the vendor advisory and the CISA catalog rather than relying on memory or third-party summaries. If Flash is installed, assume the exposure is operationally relevant until you prove otherwise, because public exploit availability and KEV listing indicate that waiting for symptoms is the wrong test.
What to do if patching or removal cannot happen immediately
If you cannot remove the software at once, treat the system as high risk and reduce its exposure path. The safest response is to isolate the affected host, restrict browsing and document rendering functions, and limit any network reachability that could let a malicious file or page trigger the vulnerable component. Where possible, Zero-Day and Exploited Vulnerabilities Guide is useful for prioritising emergency response when exploitation is already underway or likely.
Because the flaw is associated with arbitrary code execution, postponing remediation should be a short exception, not a steady state. If the asset cannot be patched quickly, document the compensating control, the business owner, and the expiry date for the exception so the risk does not become permanent by accident.
Risk and Threat Considerations
When a browser plugin or embedded runtime is publicly exploited, the main risk is not just compromise of the vulnerable process. Attackers can use initial code execution to establish persistence, stage additional payloads, or pivot to adjacent credentials and data on the same endpoint.
Failure mechanism: A malicious file, page, or embedded content path triggers the vulnerable code path, giving the attacker execution in the user context and a foothold for follow-on activity.
Impact: The endpoint may be used for malware delivery, credential theft, lateral movement, or ransomware staging, which is why CISA’s KEV listing and ransomware linkage materially increase urgency.
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 CSF 2.0 and NIST SP 800-53 Rev 5 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | CIS-7 — Continuous Vulnerability Management | Actively exploited CVEs require fast identification and prioritised remediation. |
| CIS-10 — Malware Defenses | Exploit activity and ransomware linkage make endpoint malware defenses materially relevant. | |
| Recommendation — Prioritise removal or mitigation of KEV-listed software through continuous vulnerability management. Harden endpoint defenses to reduce payload delivery and post-exploitation execution. | ||
| NIST CSF 2.0 | DE.CM-09 — Vulnerability Monitoring | The question hinges on detecting and tracking a known exploited vulnerability in the environment. |
| Recommendation — Monitor assets for the vulnerable product and escalate confirmed KEV exposure immediately. | ||
| NIST SP 800-53 Rev 5 | SI-2 — Flaw Remediation | An actively exploited software flaw requires timely remediation and exception control. |
| RA-5 — Vulnerability Monitoring and Scanning | Confirming exposure to a known exploited CVE depends on scanning and inventory evidence. | |
| Recommendation — Remediate the vulnerable component or apply compensating controls without delay. Scan for the vulnerable product and verify whether any instances remain deployed. | ||
Practitioner Guidance
What to prioritise: Prioritise locating any remaining Flash dependencies before debating exploit details. The important decision is not whether the system “should” still need Flash, but whether it actually does and whether that dependency is already reachable from untrusted content.
What to verify: Confirm removal or containment at the image, application, and endpoint levels. A clean browser policy is not enough if a legacy app, plugin container, or old VM template still carries the vulnerable component.
Practitioner takeaway: For KEV-listed flaws, exposure management comes first, proof of exploitation comes second. If the software is still present, the safe assumption is that it can be targeted now, not later.