CVE-2025-54215: Adobe InCopy RCE Vulnerability Explained

CVE-2025-54215 Overview

CVE-2025-54215 is an out-of-bounds write vulnerability [CWE-787] affecting Adobe InCopy versions 20.4, 19.5.4, and earlier. The flaw allows arbitrary code execution in the context of the current user when a victim opens a malicious file. Adobe published the issue in security advisory APSB25-80 on August 12, 2025.

The vulnerability requires user interaction and local access, but successful exploitation grants the attacker the same privileges as the logged-in user. Adobe has released patched versions for affected InCopy installations on Windows and macOS.

Critical Impact
Successful exploitation results in arbitrary code execution under the current user account, enabling attackers to install programs, modify data, or create new accounts within the user's privilege scope.

Affected Products

Adobe InCopy version 20.4 and earlier 20.x releases
Adobe InCopy version 19.5.4 and earlier 19.x releases
Microsoft Windows and Apple macOS installations of the affected versions

Discovery Timeline

2025-08-12 - CVE-2025-54215 published to NVD and Adobe Security Advisory APSB25-80 released
2025-08-13 - Last updated in NVD database

Technical Details for CVE-2025-54215

Vulnerability Analysis

The vulnerability is an out-of-bounds write condition [CWE-787] in Adobe InCopy's file parsing logic. When InCopy processes a malformed document, the application writes data beyond the bounds of an allocated memory buffer. This memory corruption can be steered to overwrite adjacent structures, function pointers, or return addresses on the stack or heap.

An attacker crafts a malicious InCopy document containing manipulated structural fields that trigger the faulty boundary calculation. When the victim opens the file, the resulting write primitive enables arbitrary code execution within the InCopy process.

The impact is bounded by the privileges of the user running InCopy. On endpoints where editors operate without least-privilege controls, the attacker inherits broader access to the file system and network resources.

Root Cause

The root cause is insufficient validation of length or offset fields during parsing of an InCopy document structure. The parser trusts attacker-controlled values, leading to a write past the end of the destination buffer. CWE-787 conditions in document parsers commonly stem from missing checks before memcpy-style operations or incorrect index arithmetic.

Attack Vector

Exploitation requires local user interaction. The attacker delivers a weaponized InCopy file through email, a shared drive, a managed file transfer system, or a download from a compromised website. The victim must open the file in a vulnerable InCopy version for the exploit to execute.

No network exposure is required, and authentication to InCopy is not necessary. The attack succeeds against any user with permission to open documents in the affected application.

Detection Methods for CVE-2025-54215

Indicators of Compromise

Unexpected child processes spawned by InCopy.exe on Windows or the InCopy binary on macOS, such as command shells, scripting hosts, or rundll32.exe.
InCopy process crashes or unexpected exits coinciding with the opening of .icml, .incx, or related document files from untrusted sources.
Outbound network connections originating from the InCopy process to unknown external hosts shortly after a document is opened.

Detection Strategies

Monitor process lineage for the InCopy executable and alert on creation of interpreter or living-off-the-land binaries as child processes.
Inspect endpoint telemetry for memory access violations, exception handler abuse, or shellcode-style allocations within the InCopy process address space.
Correlate file-open events for InCopy document formats from email attachments or browser downloads with subsequent suspicious process activity.

Monitoring Recommendations

Enable detailed process creation logging (Windows Event ID 4688 with command line, macOS Endpoint Security framework events) on endpoints with InCopy installed.
Track installed Adobe InCopy versions through software inventory tooling and flag hosts running 20.4, 19.5.4, or earlier builds.
Apply YARA or content rules to mail and web gateways for anomalous InCopy document structures originating from external senders.

How to Mitigate CVE-2025-54215

Immediate Actions Required

Update Adobe InCopy to the fixed versions listed in Adobe Security Advisory APSB25-80 on all Windows and macOS endpoints.
Inventory all systems running InCopy 20.4, 19.5.4, or earlier and prioritize patching for users handling externally sourced documents.
Instruct editorial and creative staff to avoid opening InCopy files from untrusted email, chat, or web sources until patching is complete.

Patch Information

Adobe addressed CVE-2025-54215 in the InCopy updates documented in Adobe Security Advisory APSB25-80. Administrators should deploy the fixed builds through the Creative Cloud desktop application or enterprise deployment packages. Verify the installed version after patching to confirm remediation.

Workarounds

Run InCopy under a standard user account without local administrator privileges to limit the impact of successful exploitation.
Use application allowlisting or attack surface reduction rules to block child process creation from the InCopy executable.
Route inbound InCopy documents through a sandboxed inspection environment before delivery to end users.

bash

# Verify installed Adobe InCopy version on macOS
defaults read "/Applications/Adobe InCopy 2025/Adobe InCopy 2025.app/Contents/Info.plist" CFBundleShortVersionString

# Verify installed Adobe InCopy version on Windows (PowerShell)
Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*" |
  Where-Object { $_.DisplayName -like "Adobe InCopy*" } |
  Select-Object DisplayName, DisplayVersion