CVE-2017-11839 in Edge
Summary
by MITRE
Microsoft Edge in Windows 10 Gold, 1511, 1607, 1703, 1709, Windows Server 2016 and Windows Server, version 1709 allows an attacker to take control of an affected system, due to how the scripting engine handles objects in memory, aka "Scripting Engine Memory Corruption Vulnerability". This CVE ID is unique from CVE-2017-11836, CVE-2017-11837, CVE-2017-11838, CVE-2017-11840, CVE-2017-11841, CVE-2017-11843, CVE-2017-11846, CVE-2017-11858, CVE-2017-11859, CVE-2017-11861, CVE-2017-11862, CVE-2017-11866, CVE-2017-11869, CVE-2017-11870, CVE-2017-11871, and CVE-2017-11873.
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Analysis
by VulDB Data Team • 12/14/2025
The Scripting Engine Memory Corruption Vulnerability identified as CVE-2017-11839 represents a critical security flaw in Microsoft Edge browser that affects multiple Windows 10 versions and Windows Server releases. This vulnerability specifically targets the scripting engine's handling of objects in memory, creating a pathway for remote code execution attacks that can fully compromise affected systems. The flaw manifests when the engine processes certain objects in memory, leading to unpredictable behavior that attackers can exploit to gain complete system control.
This vulnerability falls under the CWE-125 Out-of-bounds Read classification, where the scripting engine fails to properly validate memory boundaries when handling objects during execution. The issue occurs within the Chakra JavaScript engine that powers Microsoft Edge, making it particularly dangerous as it affects one of the most widely used browsers in enterprise environments. Attackers can leverage this memory corruption to execute arbitrary code with the privileges of the current user, potentially leading to full system compromise and persistent access.
The operational impact of CVE-2017-11839 extends beyond simple exploitation as it aligns with several tactics described in the MITRE ATT&CK framework, particularly those related to privilege escalation and persistence. The vulnerability enables attackers to move laterally within networks once initial access is gained, as the compromised browser can be used to establish backdoors or exfiltrate sensitive data. The affected systems include Windows 10 versions 1511, 1607, 1703, and 1709 along with Windows Server 2016 and Server version 1709, representing a broad attack surface across both client and server platforms.
Security professionals should implement immediate mitigations including deploying the relevant Microsoft security updates and applying the Windows Defender Application Control policies to restrict script execution. Organizations should also consider network segmentation and monitoring for anomalous browser behavior that might indicate exploitation attempts. The vulnerability demonstrates the importance of memory safety in modern browser engines and highlights how seemingly isolated scripting engine flaws can result in complete system compromise. Additionally, implementing automated patch management systems becomes crucial given that this vulnerability affects multiple Windows releases and requires coordinated remediation across diverse computing environments.