Adobe Flash Player Remote Code Execution (RCE) Zero-Day Vulnerability (CVE-2015-0311) Analysis and Mitigation Guide
Executive & SecOps Summary
SECOPS ASSESSMENTAdobe Flash Player through 13.0.0.262, 14.x, 15.x, and 16.x through 16.0.0.287 on Windows and OS X, and through 11.2.202.438 on Linux
Remote attackers can execute arbitrary code with the privileges of the active user and compromise the host system by enticing users to visit a website containing malicious Flash content (SWF)
Since Adobe Flash Player has reached End-of-Life (EOL), it is highly recommended to completely uninstall Flash Player from all endpoints and disable Flash plugins in web browsers
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Because Adobe Flash Player is officially EOL, the primary remediation is complete removal. On Windows systems, you can deploy the official KB4577586 update via PowerShell to permanently remove Flash Player.
# Check if the Flash Player Removal Update (KB4577586) is installed
$kb = Get-HotFix -Id KB4577586 -ErrorAction SilentlyContinue
if ($kb) {
Write-Host 'Adobe Flash Player has been successfully removed via KB4577586.'
} else {
Write-Warning 'KB4577586 is missing. Please deploy the update to remove Flash Player.'
}2. Temporary Workaround & Hardening Configuration
If immediate uninstallation is not feasible in legacy environments, apply the ActiveX Kill-Bit via the Windows Registry to prevent Internet Explorer from loading the Flash Player control.
Windows Registry Editor Version 5.00
; Set ActiveX Kill-Bit for Adobe Flash Player
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{D27CDB6E-AE6D-11cf-96B8-444553540000}]
'Compatibility Flags'=dword:00000400
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\ActiveX Compatibility\{D27CDB6E-AE6D-11cf-96B8-444553540000}]
'Compatibility Flags'=dword:000004003. Log Audit & IoC Verification Commands
Use the following command to scan for residual Flash Player shared libraries or plugins on Linux-based endpoints.
# Search for legacy Flash Player shared object files on Linux
find /usr/lib/ /usr/lib64/ -type f \( -name '*flashplayer*' -o -name '*libflashplayer.so*' \) 2>/dev/nullBlock Kernel Privilege Escalation & Ransomware Payloads Before You Can Reboot
Protect unpatched Windows, Linux, and macOS workloads against in-memory exploitation and lateral movement with autonomous EDR.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2015-0311) is a Use-After-Free (UAF) / memory corruption flaw residing within the ActionScript Virtual Machine (AVM2) of Adobe Flash Player. The root cause lies in the improper memory management during the dynamic resizing of ByteArray objects in ActionScript 3 (AS3). When a buffer is resized, the application fails to properly nullify or update the references pointing to the old memory location, leaving dangling pointers.
2. Exploitation Mechanics & Attack Scenario
An attacker exploits this vulnerability by hosting a specially crafted SWF file on a malicious or compromised website (Drive-by Download). When a victim visits the site, the malicious SWF manipulates the ByteArray size to trigger memory deallocation. The exploit then overwrites the freed memory space with attacker-controlled data, hijacks the virtual function table (vtable) pointer, bypasses DEP and ASLR using ROP (Return-Oriented Programming) chains, and executes arbitrary shellcode.
3. Infrastructure & Business Impact
This vulnerability was actively exploited in the wild as a zero-day in January 2015. Successful exploitation allows complete system compromise, enabling attackers to install malware, exfiltrate sensitive data, or establish a foothold for lateral movement within corporate networks. Legacy systems that still run outdated browsers and Flash plugins remain highly vulnerable.
Official Vendor Advisories & References
Unspecified vulnerability in Adobe Flash Player through 13.0.0.262 and 14.x, 15.x, and 16.x through 16.0.0.287 on Windows and OS X and through 11.2.202.438 on Linux allows remote attackers to execute arbitrary code via unknown vectors, as exploited in the wild in January 2015.
Frequently Asked SecOps Questions (CVE-2015-0311)
FAQQ1. How critical is CVE-2015-0311 and is it actively exploited in the wild?
CVE-2015-0311 is rated CVSS 9.8 (CRITICAL) with a 30-day EPSS exploitation probability of 85.6%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2015-0311?
Primary impacted vendors include adobe across flash_player. Scope summary: Windows & OS X: Adobe Flash Player <= 13.0.0.262, 14.x, 15.x, <= 16.0.0.287 / Linux: <= 11.2.202.438
Q3. What temporary mitigations or workarounds exist for CVE-2015-0311 before patching?
[Mitigation] Since Adobe Flash Player has reached End-of-Life (EOL), it is highly recommended to completely uninstall Flash Player from all endpoints and disable Flash plugins in web browsers Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
Generate an Internal Engineering Notice or CISO Report for CVE-2015-0311
Instantly format this advisory into an executive CISO summary or engineering patch ticket.
🔗 Related Advisories in Similar Stack (adobe)
View Category →Adobe Acrobat Reader Prototype Pollution Arbitrary Code Execution Vulnerability (CVE-2026-34621)
[Affected Scope] Adobe Acrobat Reader versions 24.001.30356, 26.001.21367 and earlier
Adobe Commerce (Magento) Server-Side Template Injection (SSTI) Remote Code Execution (CVE-2026-75650)
[Affected Scope] All unpatched versions of Adobe Commerce and Magento Open Source.
Adobe ColdFusion Path Traversal Remote Code Execution Vulnerability Urgent Advisory (CVE-2026-48282)
[Affected Scope] Adobe ColdFusion versions 2025.9, 2023.20 and earlier
Adobe Commerce (Magento) Unrestricted File Upload Vulnerability (CVE-2026-48356) - Critical RCE Advisory
[Affected Scope] All versions of Adobe Commerce and Magento Open Source prior to APSB26-73.
Subscribe to Daily Vulnerability Briefings & KEV Alerts
Concise morning briefings for SecOps, DevSecOps, and SRE teams covering newly exploited CVEs and mitigation priorities.