CVE-2025-54217: Adobe InCopy Buffer Overflow Vulnerability

CVE-2025-54217 Overview

CVE-2025-54217 is a heap-based buffer overflow vulnerability [CWE-122] affecting Adobe InCopy versions 20.4, 19.5.4, and earlier. Attackers exploit the flaw by crafting a malicious InCopy document and convincing a victim to open it. Successful exploitation results in arbitrary code execution in the context of the current user.

The vulnerability requires local access and user interaction. Adobe published security bulletin APSB25-80 addressing the issue across supported platforms. The flaw impacts both Windows and macOS installations of InCopy.

Critical Impact
Opening a malicious file triggers arbitrary code execution under the current user's privileges, enabling attackers to install malware, exfiltrate data, or pivot deeper into corporate environments.

Affected Products

Adobe InCopy versions 20.4 and earlier (20.x branch)
Adobe InCopy versions 19.5.4 and earlier (19.x branch)
Microsoft Windows and Apple macOS installations

Discovery Timeline

2025-08-12 - CVE-2025-54217 published to the National Vulnerability Database
2025-08-12 - Adobe released security bulletin APSB25-80 with patched versions
2025-08-13 - Last updated in NVD database

Technical Details for CVE-2025-54217

Vulnerability Analysis

The vulnerability is a heap-based buffer overflow [CWE-122] in Adobe InCopy's file parsing logic. InCopy allocates a heap buffer based on size metadata embedded in document structures. When the application processes a malformed document, it writes data past the allocated buffer boundary into adjacent heap memory.

Attackers craft documents that supply inconsistent or oversized field values during parsing. The resulting out-of-bounds write corrupts heap metadata, function pointers, or object virtual tables. Skilled exploitation chains this corruption into hijacked control flow and arbitrary native code execution.

The attack executes in the security context of the user running InCopy. Standard user accounts limit immediate impact, but attackers commonly combine such flaws with local privilege escalation techniques. Editorial and publishing workflows that share InCopy files across teams expand the attack surface.

Root Cause

The root cause is insufficient validation of size or length fields parsed from untrusted document data. Adobe has not disclosed the specific file structure or parser component involved. The CWE-122 classification confirms heap memory corruption rather than stack-based overflow.

Attack Vector

The attack vector is local with required user interaction. An attacker delivers a weaponized .icml or related InCopy file through email, shared storage, collaboration platforms, or cloud document services. The victim must open the file in a vulnerable InCopy version to trigger the overflow.

No network exposure or authentication bypass is needed. The exploitation flow mirrors common document-based attacks targeting creative and publishing software supply chains.

No public proof-of-concept exploit is currently available for CVE-2025-54217. Refer to the Adobe InCopy Security Advisory APSB25-80 for vendor technical details.

Detection Methods for CVE-2025-54217

Indicators of Compromise

Unexpected child processes spawned by InCopy.exe or the macOS Adobe InCopy binary, particularly shells, scripting interpreters, or network utilities
InCopy process crashes with heap corruption signatures in Windows Error Reporting or macOS crash logs immediately after opening a document
Suspicious .icml, .icma, or .icmt files arriving via email attachments or external file shares from unverified senders
Outbound network connections originating from the InCopy process to non-Adobe infrastructure

Detection Strategies

Monitor process creation telemetry for InCopy spawning cmd.exe, powershell.exe, bash, osascript, or other interpreters
Inspect file modification events where InCopy writes executable content to user-writable directories such as %TEMP% or ~/Library/
Correlate document open events with subsequent anomalous process trees using EDR storyline reconstruction
Apply YARA rules against incoming InCopy documents to identify malformed structures associated with overflow triggers

Monitoring Recommendations

Inventory all InCopy installations and confirm version numbers against the patched releases listed in APSB25-80
Forward endpoint and email gateway logs to a centralized SIEM or data lake for behavioral analysis
Alert on InCopy process memory anomalies, unexpected DLL loads, and code injection patterns

How to Mitigate CVE-2025-54217

Immediate Actions Required

Update Adobe InCopy to the fixed versions identified in the Adobe Security Bulletin APSB25-80
Restrict opening of InCopy documents received from external or untrusted sources until patching completes
Educate editorial staff on the risk of opening unsolicited .icml and related InCopy files
Enable application allowlisting and endpoint protection rules that block child process execution from InCopy

Patch Information

Adobe released fixed versions of InCopy through security bulletin APSB25-80 on 2025-08-12. Administrators should deploy the updated installers via Adobe Creative Cloud or enterprise deployment tooling. Verify update completion by checking the installed version in the InCopy About dialog after deployment.

Workarounds

No vendor-supplied workaround is available; apply the patched version as the primary mitigation
Limit InCopy execution to standard user accounts to reduce post-exploitation impact
Use email and web gateways to scan or quarantine InCopy file formats from external senders
Open suspicious documents inside isolated virtual machines or sandboxed environments for triage

bash

# Verify installed Adobe InCopy version on Windows
reg query "HKLM\SOFTWARE\Adobe\InCopy" /s | findstr /i "Version"

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