CVE-2020-1568 in Edge
Summary
by MITRE
A remote code execution vulnerability exists when Microsoft Edge PDF Reader improperly handles objects in memory. The vulnerability could corrupt memory in such a way that enables an attacker to execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. To exploit the vulnerability, in a web-based attack scenario, an attacker could host a website that contains malicious PDF content. In addition, compromised websites and websites that accept or host user-provided content could contain specially crafted PDF content that could exploit the vulnerability. However, in all cases an attacker would have no way to force a user to view the attacker-controlled content. Instead, an attacker would have to convince a user to take action. For example, an attacker could trick a user into clicking a link that takes the user to the attacker's site. The security update addresses the vulnerability by modifying how Microsoft Edge PDF Reader handles objects in memory.
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Analysis
by VulDB Data Team • 02/24/2026
This vulnerability represents a critical remote code execution flaw in Microsoft Edge's PDF Reader component that stems from improper memory handling during PDF object processing. The issue manifests when the PDF rendering engine fails to properly validate or manage memory structures containing maliciously crafted PDF objects, creating a memory corruption condition that can be exploited to execute arbitrary code. According to CWE-121, this vulnerability falls under stack-based buffer overflow conditions where insufficient memory bounds checking allows attackers to overwrite adjacent memory locations. The flaw specifically affects the Edge browser's integrated PDF viewer which processes PDF content directly within the browser context, making it a prime target for web-based exploitation campaigns.
The operational impact of this vulnerability extends beyond simple privilege escalation to full system compromise when users with administrative rights are targeted. Attackers can leverage this weakness to establish persistent access through privilege elevation, enabling them to install malicious software, modify or delete critical system data, and create new user accounts with complete administrative privileges. The attack vector requires user interaction through social engineering techniques since the exploitation cannot occur automatically when users simply visit compromised websites. This limitation does not reduce the threat level significantly, as modern phishing campaigns can effectively trick users into clicking malicious links or visiting compromised sites containing specially crafted PDF content designed to trigger the memory corruption.
From a cybersecurity perspective, this vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter and T1068 for exploit for privilege escalation. The security update implemented by Microsoft addresses the root cause by modifying the memory handling mechanisms within the PDF Reader component to properly validate object structures and implement robust memory boundary checking. Organizations should prioritize immediate deployment of the security patch since the vulnerability affects the widely used Edge browser and presents a high-risk exposure for enterprise environments. The remediation strategy should include comprehensive browser updates across all affected systems, along with enhanced web filtering and user education programs to reduce the success rate of social engineering attacks that could exploit this weakness. Additionally, network monitoring should be enhanced to detect unusual PDF file access patterns that might indicate exploitation attempts.