CVE-2025-54209 is a heap-based buffer overflow vulnerability identified in Adobe InDesign Desktop versions 20.4, 19.5.4, and earlier. The vulnerability arises from improper handling of data within the application’s memory heap, allowing an attacker to overwrite memory buffers beyond their allocated size. This can lead to arbitrary code execution in the context of the current user. Exploitation requires the victim to open a specially crafted malicious InDesign file, which triggers the overflow condition. The vulnerability is classified under CWE-122, indicating a classic heap-based buffer overflow issue. The CVSS 3.1 base score of 7.8 reflects high severity, with attack vector local (requiring user interaction), low attack complexity, no privileges required, and user interaction necessary. The impact includes potential full compromise of the affected system’s confidentiality, integrity, and availability, as arbitrary code execution could allow installation of malware, data theft, or system disruption. No patches or fixes are currently linked, and no known exploits have been reported in the wild as of the publication date. However, the risk remains significant due to the widespread use of Adobe InDesign in professional environments and the ease of triggering the vulnerability through user action.

The vulnerability poses a significant threat to organizations relying on Adobe InDesign Desktop for content creation, publishing, and design workflows. Successful exploitation can lead to arbitrary code execution, enabling attackers to install malware, steal sensitive data, or disrupt operations. Since the code executes with the current user's privileges, the impact depends on the user’s access level; administrative users could face full system compromise. The requirement for user interaction limits remote exploitation but does not eliminate risk, especially in environments where users frequently open files from external or untrusted sources. The vulnerability could be leveraged in targeted attacks against media companies, advertising agencies, and other creative industries. Additionally, the compromise of design files could lead to intellectual property theft or sabotage of published content. The absence of known exploits in the wild currently reduces immediate risk but does not preclude future exploitation once the vulnerability becomes publicly known.

Organizations should implement a multi-layered approach to mitigate this vulnerability. First, monitor Adobe’s official channels for patches or updates addressing CVE-2025-54209 and apply them promptly once available. Until patches are released, restrict the opening of InDesign files from untrusted or unknown sources by enforcing strict email and file-sharing policies. Disable automatic preview or rendering of InDesign files in email clients or file explorers to reduce accidental triggering. Educate users about the risks of opening unsolicited or suspicious files and encourage verification of file origins. Employ endpoint protection solutions with heuristic and behavior-based detection capabilities to identify and block attempts to exploit buffer overflow conditions. Consider sandboxing or running Adobe InDesign in a restricted environment to limit the impact of potential exploitation. Regularly back up critical data and maintain incident response plans to quickly address any compromise resulting from exploitation.