CVE-2014-0502 is a double free vulnerablity vulnerability in Adobe Flash Player. CISA added it to the Known Exploited Vulnerabilities catalogue on 17 September 2024, which means attackers have used it in real attacks. Adobe Flash Player contains a double free vulnerability that allows a remote attacker to execute arbitrary code.
What a double free vulnerability means in a Flash Player context
A double free happens when software releases the same memory twice. In a browser plugin or media runtime like Adobe Flash Player, that kind of memory corruption can destabilise the process and give an attacker a path to execute arbitrary code.
Because the flaw is reachable through remote content, the danger is not limited to local crashes. It sits in the class of vulnerabilities where a crafted file, page, or embedded object can trigger unsafe memory handling in the client.
Why this vulnerability class is dangerous
Memory-management bugs are often high impact because they can convert malformed input into control-flow compromise. In practical terms, a double free may let an attacker corrupt allocator metadata, steer execution, or chain the bug with other weaknesses to increase reliability.
For legacy browser plugins, the risk is amplified by broad client exposure and the historical tendency for exploit chains to target users through drive-by delivery. That is why exploited vulnerabilities like this belong in active patch and exposure review workflows rather than being treated as routine defects.
NIST National Vulnerability Database and CVE Program are the authoritative places to verify the identifier, the record details, and related security metadata for this issue.
How organisations check exposure and reduce blast radius
The first step is to confirm whether Adobe Flash Player is present anywhere in the environment, including managed desktops, unmanaged endpoints, virtual desktops, and archived images. Exposure checks should also account for internet-facing systems that may still accept content capable of invoking the vulnerable component.
From there, organisations should use vendor advisory data, asset inventory, and vulnerability management prioritisation to determine where the software still exists and whether compensating controls are needed while removal or patching is being completed. For a broader process view, Vulnerability Management Guide covers the prioritisation logic that matters when a flaw is already known to be exploited.
Because this vulnerability is in a client-side runtime, reducing attack surface matters as much as remediation. Disabling or removing unsupported software, restricting web content sources, and limiting execution paths can all reduce the chance that a malicious payload reaches the vulnerable code.
Detection, remediation, and post-exploitation review
When a vulnerability has been used in the wild, defenders should assume that exploitation may have occurred before patching finished. That makes post-patch review important: look for crash telemetry, suspicious child processes, unusual downloads, persistence changes, and evidence that the compromised browser session was used as an initial foothold.
If compromise is suspected, the review should extend beyond the browser process itself. Arbitrary code execution can lead to credential theft, browser session hijack, malware staging, or follow-on access to adjacent systems, so incident response needs to consider what the attacker could reach after gaining code execution.
For a concise model of how actively exploited issues should be triaged and hunted, Zero-Day and Exploited Vulnerabilities Guide gives the right operational lens, even when the flaw is no longer a fresh zero-day.
Risk and Threat Considerations
When an exploitable memory-corruption flaw is published and later added to the KEV catalogue, the main risk is not just software instability, but real-world exploitation against exposed or unpatched endpoints. In practice, the attacker goal is usually initial code execution, followed by payload delivery, persistence, or lateral movement.
Failure mechanism: A crafted object or page drives the vulnerable Flash Player code path into double-free memory corruption, which can destabilise the process and be shaped into arbitrary code execution.
Impact: Successful exploitation can give an attacker control of the client process, enable malware installation, and open a route to broader compromise of the user environment.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
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 | Addresses remediation of exploited software flaws like this Flash Player vulnerability |
| RA-5 — Vulnerability Monitoring and Scanning | Supports exposure discovery and confirmation of vulnerable installations | |
| SI-4 — System Monitoring | Supports detection of exploitation and post-compromise review after arbitrary code execution | |
| Recommendation — Prioritise SI-2 to remediate the vulnerable software and verify remediation across the estate. Use RA-5 to identify affected assets and validate whether the vulnerable component is still present. Apply SI-4 to monitor for exploit indicators, suspicious child processes, and post-exploitation activity. | ||
| CIS Controls v8 | CIS-7 — Continuous Vulnerability Management | Covers prioritising and remediating actively exploited vulnerabilities across endpoints |
| CIS-8 — Audit Log Management | Supports detection and incident review after exploitation of a client-side code execution flaw | |
| Recommendation — Use CIS-7 to inventory exposed systems and accelerate remediation of exploited software. Use CIS-8 to preserve and review logs for exploitation signs and follow-on activity. | ||
Practitioner Guidance
Why practitioners should care: Treat KEV-listed client-side code execution bugs as exposure management issues, not just patch tickets. If the vulnerable component is still installed, the practical question is how quickly you can remove reachability and verify that no exposed endpoint remains.
What to watch for: Prioritise internet-facing systems, remote users, and any estate that still relies on legacy content paths. If the software cannot be removed immediately, compensate by tightening application execution paths and monitoring for suspicious child processes or unexpected downloads.
Practitioner takeaway: For a flaw like this, the security outcome depends on finding every remaining instance, not only on applying a fix to the systems you already know about.