CVE-2015-7645: Adobe Flash Player Arbitrary Code Execution Vulnerability

CVE-2015-7645 is an arbitrary code execution vulnerability in Adobe Flash Player. A remote attacker can trigger it by supplying a crafted SWF file, allowing code of the attacker’s choosing to run in the context of the Flash Player process. Because Flash historically ran inside browsers and other host applications, successful exploitation can give an attacker a foothold on the endpoint. Public reporting associates this vulnerability with ransomware activity, and CISA notes that the product is end-of-life and should be disconnected if still present.

How it works

The publicly described weakness is that Adobe Flash Player fails to handle a maliciously crafted SWF file safely, resulting in arbitrary code execution. In practical terms, an attacker delivers or lures a user to open a specially formed SWF. When the player parses that file, control flow or memory safety is compromised and attacker-supplied code runs with the privileges of the Flash process (often the browser or a desktop application that embeds the player).

Exact memory-corruption or parsing details are not provided in the summary; defenders should treat this as a classic remote code-execution flaw in a media/plugin component and confirm any deeper technical description against the original vendor advisory. No exploit code or specific trigger conditions beyond “crafted SWF” are assumed here.

Am I affected? How to find it in your systems

Adobe Flash Player was commonly installed as a browser plugin, an ActiveX control, or a stand-alone projector on Windows, macOS, and legacy Linux desktops, and was sometimes bundled with enterprise software or kiosks. Because the product is end-of-life, any remaining installation is out of support and should be treated as affected until proven otherwise.

• Inventory endpoints for Flash Player binaries, browser plug-in directories, and registry or package-manager entries that reference Flash or SWF handlers.
• Search software asset and vulnerability-management data for any Adobe Flash Player package; confirm the precise build against the vendor advisory if you still have records of older versions.
• Check browser configurations and group-policy settings that may still enable NPAPI/ActiveX Flash content.
• Review web proxy, email gateway, and endpoint logs for .swf downloads or executions, especially from untrusted sources; look for subsequent suspicious child processes spawned by browser or Flash-related executables as possible signs of exploitation.

If Flash is discovered, assume exposure until the component is removed; do not rely on version strings alone without cross-checking the advisory.

How to remediate

The definitive remediation is to eliminate the vulnerable component. CISA’s required action states that the impacted product is end-of-life and should be disconnected if still in use. Remove Adobe Flash Player completely from all systems, disable any remaining browser plug-in or MIME-type handlers for SWF content, and uninstall related runtimes or projectors.

• Apply the vendor’s final removal guidance or uninstaller; verify that no Flash libraries remain in Program Files, browser plugin folders, or system directories.
• Update enterprise software catalogs and golden images so Flash cannot be reintroduced.
• Where a third-party application still hard-depends on Flash, isolate or replace that application; do not leave the player enabled solely for legacy compatibility.

After removal, validate with the same inventory methods used for detection. Confirm any residual configuration details against the original Adobe advisory and CISA guidance.

If you can't patch immediately

Because the product is end-of-life, “patching” is not a realistic long-term option; the priority is rapid isolation or removal. Until Flash can be fully excised, apply the following compensating controls:

• Network segmentation: place any host that still requires Flash in a tightly restricted VLAN or enclave with no direct internet access and minimal lateral connectivity.
• Application control / allow-listing: block execution of Flash Player binaries and prevent browsers from loading the plug-in.
• Content filtering: strip or block SWF files at email and web gateways; deny the application/x-shockwave-flash MIME type.
• Virtual patching / WAF rules: if a web application still serves Flash content, use a web application firewall or reverse-proxy rule to drop crafted SWF payloads, understanding that this is only a temporary shield.
• Heightened monitoring: alert on any process creation from Flash-related executables, unexpected network connections from those processes, and ransomware-like behaviors (mass file encryption, shadow-copy deletion).

These measures reduce but do not eliminate risk; schedule permanent removal as soon as possible.

If your data may have been exposed

Actively exploited vulnerabilities, including those linked to ransomware, frequently lead to data theft or encryption. If Flash Player was present on systems that handled sensitive information, treat those hosts as potentially compromised: isolate them, preserve forensic evidence, and begin incident-response procedures. As an additional check, you can run a free exposure scan of your email addresses against known breach data sets to see whether credentials or personal information have already appeared in public dumps.