CVE-2014-0497: Adobe Flash Player Integer Underflow Vulnerablity

CVE-2014-0497 is an integer underflow vulnerability in Adobe Flash Player that can let a remote attacker execute arbitrary code. Because Flash content was historically embedded in web pages and other documents, successful exploitation could give an attacker control of the host process and potentially the endpoint. The product is end-of-life, so organizations still running it face ongoing risk and should treat removal as the primary goal.

Defenders need to confirm the exact impact and any remaining support status against the original vendor advisory, then prioritize discovery and elimination of residual Flash installations.

How it works

The flaw is classified as CWE-191 (Integer Underflow). In an integer underflow, a calculation produces a value smaller than the type can represent, wrapping around to a large positive number. When that result is later used for memory allocation or buffer sizing, the program can allocate too little space or miscalculate offsets. An attacker who can supply crafted input that triggers the underflow may then overwrite adjacent memory, leading to arbitrary code execution inside the Flash Player process.

In practice this class of bug is typically reached by delivering malicious Flash content (for example via a web page or document that embeds a SWF). The attacker does not need local access; the victim only has to open or view the content. Exact trigger conditions and payload formats are not detailed here and must be confirmed against the vendor advisory if forensic analysis is required.

Am I affected? How to find it in your systems

Adobe Flash Player historically ran as a browser plug-in, as a standalone player, and as an ActiveX or NPAPI component on Windows, macOS, and Linux endpoints. It also appeared in enterprise software that embedded the Flash runtime for rich media or UI elements.

• Inventory every endpoint and server for the presence of Flash Player binaries, plug-in directories, or registry/COM entries associated with Adobe Flash.
• Check browser extension lists, installed-programs inventories, and software-asset-management databases for any remaining Flash components.
• Because the product is end-of-life, any detected installation should be treated as out of support; confirm residual version details against the vendor advisory if needed for prioritization.
• Review web-proxy, EDR, and browser logs for attempts to load .swf files or for process crashes in Flash-related modules, which can be early indicators of exploitation attempts.

Telemetry that shows unexpected Flash process launches or memory-corruption crashes should be escalated for investigation even if no confirmed exploit is observed.

How to remediate

The CISA-required action is clear: the product is end-of-life and/or end-of-service, so users should discontinue utilization of Adobe Flash Player. Apply any final vendor update that may still be available for transitional systems, then remove the software entirely.

• Uninstall Flash Player from all managed endpoints using the vendor’s removal tool or standard package-management commands.
• Disable or remove browser plug-ins and ActiveX controls that load Flash content.
• Block Flash MIME types and file extensions at web proxies and email gateways so residual content cannot execute.
• Update group-policy or configuration-management baselines to prevent reinstallation.

After removal, verify that no Flash processes or libraries remain and that applications previously dependent on Flash have been migrated to modern alternatives.

If you can't patch immediately

Because the product is end-of-life, “patching” is not a sustainable option; compensating controls must bridge the gap until complete removal is finished.

• Segment any remaining Flash-enabled hosts onto isolated network zones with strict egress filtering.
• Apply virtual patching or WAF rules that block known Flash exploit patterns and deny delivery of .swf content.
• Disable Flash rendering in browsers and document viewers via enterprise policy.
• Increase monitoring for Flash process creation, anomalous memory allocations, and outbound connections from those processes.
• Restrict user privileges so that even a successful code-execution attempt has limited impact.

These measures reduce exposure but do not eliminate the underlying risk; full decommissioning remains the only durable fix.

If your data may have been exposed

Actively exploited vulnerabilities of this class have historically led to endpoint compromise and subsequent data theft. If you suspect Flash-related exploitation, assume the host may have been under attacker control and perform standard incident-response steps: isolate the system, collect forensic images, and hunt for lateral movement. As a quick additional check, you can run a free exposure scan of your email address against known breach data sets to see whether credentials or personal information have already appeared in public dumps.