CVE-2025-30327 Overview
CVE-2025-30327 is an integer overflow vulnerability [CWE-190] affecting Adobe InCopy versions 20.2, 19.5.3, and earlier. An attacker can exploit the flaw to execute arbitrary code in the context of the current user. Exploitation requires user interaction, as the victim must open a malicious file crafted by the attacker. Adobe disclosed the issue in security bulletin APSB25-41 on June 10, 2025. The vulnerability impacts both Windows and macOS installations of InCopy.
Critical Impact
Successful exploitation leads to arbitrary code execution under the privileges of the user running InCopy, enabling attackers to install malware, exfiltrate data, or pivot deeper into the environment.
Affected Products
- Adobe InCopy 20.2 and earlier
- Adobe InCopy 19.5.3 and earlier
- Runs on Microsoft Windows and Apple macOS
Discovery Timeline
- 2025-06-10 - CVE-2025-30327 published to NVD and Adobe released security bulletin APSB25-41
- 2025-07-14 - Last updated in NVD database
Technical Details for CVE-2025-30327
Vulnerability Analysis
The vulnerability is an integer overflow or wraparound condition in Adobe InCopy's file parsing logic. When InCopy processes a specially crafted document, an arithmetic operation produces a value that exceeds the storage type's range. The wrapped value is then used in subsequent memory allocation or indexing operations. This produces an undersized buffer or out-of-bounds access that an attacker controls. The result is arbitrary code execution within the InCopy process and the user's security context.
Root Cause
The root cause is improper validation of size or length fields parsed from untrusted file content. Adobe categorizes the weakness under [CWE-190] Integer Overflow or Wraparound. Code paths that compute buffer sizes from attacker-controlled values fail to detect arithmetic overflow before allocation. The resulting allocation is smaller than the data later written into it, corrupting adjacent memory.
Attack Vector
The attack vector is local and requires user interaction. An attacker delivers a malicious InCopy document through email, web download, or shared storage. When the victim opens the file, InCopy parses the crafted structure and triggers the overflow. No elevated privileges are required by the attacker prior to exploitation. Code executes with the privileges of the user, which on many endpoints includes broad access to user files and local resources.
No public proof-of-concept exploit is currently available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. Detailed exploitation specifics are not provided in the public advisory. Refer to the Adobe Security Advisory APSB25-41 for vendor guidance.
Detection Methods for CVE-2025-30327
Indicators of Compromise
- Unexpected child processes spawned by InCopy.exe on Windows or the Adobe InCopy process on macOS, particularly shells, scripting hosts, or rundll32.exe.
- InCopy crash reports or Windows Error Reporting events referencing memory access violations during document open operations.
- InCopy documents (.icml, .incx, .idml) arriving from untrusted sources, especially via email attachments or external file shares.
Detection Strategies
- Hunt for process lineage anomalies where InCopy is the parent of command interpreters, network utilities, or persistence-related binaries.
- Monitor file-write activity by InCopy outside of typical user document directories, which may indicate dropped payloads.
- Correlate document open events with outbound network connections initiated shortly afterward by InCopy or its child processes.
Monitoring Recommendations
- Enable endpoint logging of process creation with full command line and parent process metadata across InCopy hosts.
- Forward Adobe application telemetry and crash data to a centralized SIEM for cross-host correlation.
- Maintain an inventory of InCopy versions in use to identify hosts still running vulnerable builds.
How to Mitigate CVE-2025-30327
Immediate Actions Required
- Update Adobe InCopy to the fixed versions identified in Adobe security bulletin APSB25-41 on all Windows and macOS endpoints.
- Instruct users not to open InCopy files received from untrusted or unverified sources until patching is complete.
- Restrict file associations so that InCopy documents from email or browsers prompt before opening.
Patch Information
Adobe published fixes in security bulletin APSB25-41 on June 10, 2025. Administrators should deploy the updated InCopy releases listed in the advisory across both Windows and macOS. Refer to the Adobe Security Advisory APSB25-41 for exact fixed version numbers and download links.
Workarounds
- Apply application allowlisting to prevent InCopy from launching unapproved child processes.
- Use email gateway policies to quarantine or sandbox inbound InCopy file types pending review.
- Run InCopy under standard user accounts without local administrator privileges to limit post-exploitation impact.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
