CVE-2024-20727 in Acrobat 2020
Summary
by MITRE • 02/15/2024
Acrobat Reader versions 20.005.30539, 23.008.20470 and earlier are affected by an out-of-bounds write vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
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Analysis
by VulDB Data Team • 07/06/2026
This vulnerability represents a critical out-of-bounds write flaw in Adobe Acrobat Reader affecting multiple version ranges including 20.005.30539, 23.008.20470 and earlier versions. The technical nature of this flaw allows for arbitrary code execution when a malicious file is opened by an unsuspecting user, making it particularly dangerous in enterprise environments where document sharing is common. The vulnerability stems from insufficient bounds checking within the application's processing of specially crafted PDF files, which can cause memory corruption when the software attempts to write data beyond allocated memory boundaries.
The operational impact of this vulnerability extends beyond simple privilege escalation as it enables attackers to execute malicious code with the privileges of the currently logged-in user. This means that successful exploitation could lead to complete system compromise without requiring administrative access or elevated privileges. The requirement for user interaction through opening a malicious file creates a social engineering vector that attackers can leverage through phishing campaigns, malicious email attachments, or compromised websites. Attackers could craft PDF documents containing malformed data structures that trigger the out-of-bounds write condition when processed by Acrobat Reader.
From a cybersecurity perspective, this vulnerability aligns with CWE-787 which specifically addresses out-of-bounds writes in software applications. The flaw demonstrates poor input validation and memory management practices that are commonly exploited in targeted attacks against productivity software like document readers. The ATT&CK framework categorizes this as a technique involving initial access through malicious files followed by execution, potentially leading to privilege escalation and lateral movement within compromised networks. Organizations running affected versions of Acrobat Reader face significant risk exposure since the vulnerability can be exploited through various attack vectors including email-based social engineering.
Mitigation strategies should prioritize immediate patching of all affected Acrobat Reader installations to the latest available security updates from Adobe. Network administrators should implement email filtering solutions to detect and block suspicious PDF attachments, while endpoint protection measures should monitor for unusual file execution patterns. Security teams should also consider implementing application whitelisting policies that restrict execution of unauthorized software, particularly in high-risk environments. Regular vulnerability assessments and penetration testing should be conducted to identify other potentially vulnerable applications within the organization's attack surface. The remediation process must include thorough testing of patches in controlled environments before deployment to ensure compatibility with existing business processes and workflows.