CVE-2022-37353 in PDF-XChange Editor
Summary
by MITRE • 03/29/2023
This vulnerability allows remote attackers to disclose sensitive information on affected installations of PDF-XChange Editor. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of EMF files. Crafted data in an EMF file can trigger a read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the current process. Was ZDI-CAN-17637.
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Analysis
by VulDB Data Team • 06/18/2026
This vulnerability in PDF-XChange Editor represents a critical buffer overread flaw that demonstrates the complex security challenges inherent in document processing software. The vulnerability specifically affects the software's handling of EMF (Enhanced Metafile) files, which are vector graphics formats commonly used in Windows environments. When processing maliciously crafted EMF files, the application fails to properly validate buffer boundaries during parsing operations, leading to memory access violations that can expose sensitive data. This type of vulnerability falls under the CWE-125 category of "Out-of-bounds Read" and aligns with ATT&CK technique T1203 "Exploitation for Client Execution" as it enables remote code execution through client-side exploitation.
The technical implementation of this flaw occurs during the EMF file parsing phase where the application attempts to read data beyond the allocated memory buffer boundaries. This buffer overread condition can be triggered when a user visits a malicious webpage containing embedded EMF content or when opening a specially crafted EMF file directly. The vulnerability requires user interaction to be exploited, making it a client-side attack vector that relies on social engineering tactics to deliver malicious payloads. The attack chain typically begins with a user visiting a compromised website or opening a malicious document, which then triggers the vulnerable parsing code that reads past the end of allocated memory regions.
From an operational impact perspective, this vulnerability creates significant risk for organizations using PDF-XChange Editor as their primary document processing tool. The ability to execute arbitrary code in the context of the current process means that attackers can potentially escalate privileges, install backdoors, or access sensitive system resources. The vulnerability's classification as a remote code execution flaw makes it particularly dangerous in enterprise environments where users frequently interact with untrusted web content and document files. Security teams must consider that this vulnerability could be leveraged in targeted attacks against specific organizations or as part of broader exploit campaigns.
Organizations should implement multiple layers of defense to mitigate this vulnerability effectively. Immediate remediation efforts should focus on applying vendor-provided patches or updates that address the buffer overread condition in EMF file parsing. Network segmentation and web filtering solutions can help prevent users from accessing malicious websites that might contain exploit code. Additionally, user education programs should emphasize the dangers of visiting untrusted websites or opening unexpected email attachments. Security monitoring should include detection of unusual file processing activities and memory access patterns that might indicate exploitation attempts. The vulnerability's characteristics align with ATT&CK tactic T1059 "Command and Scripting Interpreter" and T1068 "Exploitation for Privilege Escalation" as attackers can leverage the code execution capability to establish persistent access and expand their control within compromised systems.