CVE-2016-1010

What Is Adobe Flash Player and AIR?

Adobe Flash Player was the dominant cross-platform browser multimedia plugin, installed on over 90% of internet-connected computers at peak deployment. Adobe AIR is the desktop application runtime built on Flash technology. Both products reached end-of-life on December 31, 2020. The complexity of SWF file parsing and ActionScript execution made Flash a persistent high-value attack surface for exploit kit operators throughout the 2010s.

Overview

CVE-2016-1010 is an integer overflow remote code execution vulnerability in Adobe Flash Player and AIR that enables heap-based memory corruption and code execution via a specially crafted SWF file. An integer arithmetic operation in Flash's processing code produces a value that overflows the integer type, resulting in an undersized buffer allocation — subsequent writes into this buffer corrupt adjacent heap memory, enabling exploitation. Patched in APSB16-08 (March 10, 2016). Flash and AIR are permanently end-of-life since December 2020.

Affected Versions

Technical Details

Root Cause: Integer Overflow Leading to Heap Buffer Overflow

CVE-2016-1010 is an integer overflow (CWE-190) in Flash Player or AIR's SWF content processing or ActionScript runtime. The vulnerability occurs when an arithmetic computation involving a value derived from SWF content produces a result that wraps around the integer type:

1. Overflow trigger — Flash performs a size calculation (total_size = a * b or similar) using attacker-controlled values from the SWF file, producing an integer overflow
2. Undersized allocation — the overflowed (too-small) value is used to allocate a heap buffer
3. Out-of-bounds write — Flash writes the actual (larger) amount of data into the undersized buffer, corrupting adjacent heap objects
4. Heap corruption exploitation — the corruption is leveraged via heap grooming to overwrite function pointers or object vtables
5. Code execution — Flash's execution redirected to attacker-controlled shellcode or ROP chain

Integer overflow vulnerabilities differ from UAF vulnerabilities in their root cause but follow a similar exploitation path once heap corruption is achieved.

Attack Characteristics

Discovery

Identified and reported to Adobe; patched in APSB16-08 (March 2016), which addressed multiple Flash Player vulnerabilities.

Exploitation Context

• Continuous Flash exploitation cycle: Exploit kit operators maintained Flash exploitation as a primary attack vector through 2016; each new Flash patch release typically provided analysis material for identifying the fixed vulnerability class and developing new exploits for unpatched users who had not yet applied the update
• Flash EOL permanent exposure: Flash Player and AIR are permanently end-of-life since December 2020; all known vulnerabilities including CVE-2016-1010 remain permanently unpatched for any remaining Flash installations
• CISA KEV (2022): Added May 2022

Remediation

1. Remove Flash Player and AIR — uninstall from all systems. Adobe's Flash uninstaller and Microsoft's KB4577586 (Windows Update) remove Flash. Both products are permanently EOL.

2. Migrate Flash/AIR-dependent applications — replace Flash content and AIR applications with HTML5 or supported alternatives.

3. Network isolation — Flash-dependent systems that cannot be decommissioned should be isolated from internet access.

4. Browser controls — all modern browsers have removed Flash support.