CVE-2010-4091 in Acrobat Reader
Summary
by MITRE
The EScript.api plugin in Adobe Reader and Acrobat 10.x before 10.0.1, 9.x before 9.4.1, and 8.x before 8.2.6 on Windows and Mac OS X allows remote attackers to execute arbitrary code or cause a denial of service (application crash) via a crafted PDF document that triggers memory corruption, involving the printSeps function. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 12/27/2025
The vulnerability identified as CVE-2010-4091 represents a critical memory corruption flaw within the EScript.api plugin of Adobe Reader and Acrobat software across multiple versions. This vulnerability specifically affects Windows and Mac OS X operating systems and stems from improper handling of the printSeps function within the plugin's code execution environment. The flaw exists in versions 10.x prior to 10.0.1, 9.x prior to 9.4.1, and 8.x prior to 8.2.6, making it a widespread issue affecting a significant portion of the Adobe Acrobat user base during that time period.
The technical implementation of this vulnerability involves a heap-based buffer overflow condition that occurs when processing maliciously crafted PDF documents. When the printSeps function encounters malformed input data during the document processing workflow, it fails to properly validate the size of memory allocations, leading to memory corruption that can be exploited by remote attackers. This memory corruption manifests as either arbitrary code execution privileges or denial of service conditions that result in application crashes. The vulnerability operates at the intersection of multiple security domains including memory management, input validation, and plugin architecture security, making it particularly dangerous as it leverages the legitimate plugin functionality to achieve malicious objectives.
From an operational perspective, this vulnerability presents a severe risk to enterprise environments where Adobe Acrobat Reader is widely deployed for document processing and viewing. Attackers can craft sophisticated PDF documents that, when opened by vulnerable software versions, automatically trigger the memory corruption exploit without requiring user interaction beyond opening the malicious file. The impact extends beyond individual user devices to potentially compromise entire network infrastructures, as these applications are commonly used in business environments for processing sensitive documents. The vulnerability's remote exploitability means that threat actors can deliver malicious payloads through email attachments, web downloads, or compromised websites without needing physical access to target systems.
Security researchers have classified this vulnerability according to the Common Weakness Enumeration framework as a heap-based buffer overflow weakness, specifically categorized under CWE-121 which deals with stack-based buffer overflow conditions, though the memory corruption manifests in heap memory areas. The exploitability characteristics align with ATT&CK technique T1203, which describes exploitation of software vulnerabilities for code execution, and T1059 which covers command and scripting interpreter usage. Organizations affected by this vulnerability should implement immediate mitigations including patching to the latest available versions of Adobe Reader and Acrobat, implementing network-based restrictions on PDF file downloads, and deploying application whitelisting solutions to prevent execution of untrusted PDF documents.
The remediation approach for CVE-2010-4091 requires comprehensive patch management across all affected Adobe products, with particular attention to the EScript.api plugin component that contains the vulnerable printSeps function. Adobe released security updates that address the memory corruption issue by implementing proper bounds checking and memory allocation validation within the plugin's processing logic. Organizations should also consider implementing additional security controls such as sandboxing environments for PDF processing, content filtering solutions, and user education programs to reduce the risk of successful exploitation. The vulnerability demonstrates the importance of maintaining up-to-date security patches for third-party software components and highlights the need for robust input validation mechanisms in plugin architectures that handle untrusted data from external sources.