CVE-2025-54216 Overview
CVE-2025-54216 is an out-of-bounds write vulnerability [CWE-787] affecting Adobe InCopy versions 20.4, 19.5.4, and earlier. The flaw allows attackers to achieve arbitrary code execution in the context of the current user. Exploitation requires user interaction: a victim must open a malicious file crafted to trigger the memory corruption. The issue affects InCopy installations on both Microsoft Windows and Apple macOS. Adobe addressed the vulnerability in Security Bulletin APSB25-80.
Critical Impact
Successful exploitation results in arbitrary code execution under the privileges of the user running InCopy, enabling attackers to install programs, modify data, or create accounts when administrative privileges are held.
Affected Products
- Adobe InCopy 20.4 and earlier (20.x branch)
- Adobe InCopy 19.5.4 and earlier (19.x branch)
- Microsoft Windows and Apple macOS installations
Discovery Timeline
- 2025-08-12 - CVE-2025-54216 published to NVD
- 2025-08-13 - Last updated in NVD database
Technical Details for CVE-2025-54216
Vulnerability Analysis
The vulnerability is an out-of-bounds write in Adobe InCopy's file parsing logic. InCopy processes structured document formats during file open operations. A crafted file can manipulate parser state so that the application writes data beyond the bounds of an allocated buffer. Out-of-bounds writes corrupt adjacent memory structures, including heap metadata, function pointers, or virtual table pointers.
Attackers shape the corrupted memory to redirect control flow into attacker-supplied instructions. Because InCopy runs in the user's security context, the resulting code execution inherits the user's privileges, file access, and network reach. The attack requires only that a victim opens the malicious document, making spear-phishing a practical delivery method against editorial and publishing workflows.
Root Cause
The root cause is missing or incorrect bounds validation when InCopy writes parsed file content into an internal buffer. The parser trusts size or offset values derived from the input file without verifying them against the destination buffer size. This violates safe memory handling and falls under CWE-787, Out-of-Bounds Write.
Attack Vector
The attack vector is local and requires user interaction. An attacker delivers a malicious InCopy file through email, shared storage, or a watering-hole site. When the user opens the file in a vulnerable InCopy build, the parser triggers the out-of-bounds write and the embedded payload executes. No network access to the victim is required after delivery.
No verified public proof-of-concept or in-the-wild exploitation has been reported. See the Adobe Security Bulletin APSB25-80 for vendor technical details.
Detection Methods for CVE-2025-54216
Indicators of Compromise
- Unexpected child processes spawned by InCopy.exe (Windows) or the InCopy application bundle (macOS), particularly shells, scripting engines, or rundll32.exe.
- InCopy process performing outbound network connections to unfamiliar hosts shortly after a document is opened.
- Crash reports or Windows Error Reporting entries citing access violations in InCopy modules following the receipt of .icml, .indd, or related files.
Detection Strategies
- Hunt for process lineage where InCopy launches non-Adobe binaries, which is anomalous for normal editorial work.
- Inspect document files arriving via email or collaboration platforms for InCopy formats originating from external or untrusted senders.
- Correlate InCopy crashes with subsequent persistence activity such as scheduled task creation, registry Run key modifications, or Launch Agent installation.
Monitoring Recommendations
- Enable endpoint logging for process creation with command-line capture on all workstations running Adobe Creative Cloud applications.
- Monitor file write events in user profile directories made by InCopy.exe to detect dropper behavior.
- Alert on outbound network connections initiated by InCopy to non-Adobe destinations.
How to Mitigate CVE-2025-54216
Immediate Actions Required
- Apply the Adobe InCopy updates referenced in Adobe Security Bulletin APSB25-80 to all affected endpoints.
- Inventory Creative Cloud deployments to identify hosts still running InCopy 20.4, 19.5.4, or earlier builds.
- Instruct users to avoid opening InCopy files received from untrusted or unverified sources until patching completes.
Patch Information
Adobe released fixed InCopy versions through the Creative Cloud desktop application and the enterprise admin console. Administrators should deploy the updates documented in APSB25-80 to remediate CVE-2025-54216. Verify installed versions through Help > About InCopy after updating.
Workarounds
- Restrict execution of InCopy to standard user accounts to limit the impact of arbitrary code execution.
- Block inbound delivery of unsolicited Adobe document formats at email gateways for users who do not require them.
- Use application allowlisting to prevent InCopy from spawning interpreters such as powershell.exe, cmd.exe, or wscript.exe.
# Windows: query installed InCopy version via registry
reg query "HKLM\SOFTWARE\Adobe\InCopy" /s /f Version
# macOS: check InCopy bundle version
defaults read "/Applications/Adobe InCopy 2024/Adobe InCopy 2024.app/Contents/Info.plist" CFBundleShortVersionString
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
