CVE-2018-0933 in Edge
Summary
by MITRE
ChakraCore and Microsoft Windows 10 Gold, 1511, 1607, 1703, 1709, and Windows Server 2016 allows remote code execution, due to how the Chakra scripting engine handles objects in memory, aka "Chakra Scripting Engine Memory Corruption Vulnerability". This CVE ID is unique from CVE-2018-0872, CVE-2018-0873, CVE-2018-0874, CVE-2018-0930, CVE-2018-0931, CVE-2018-0934, CVE-2018-0936, and CVE-2018-0937.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 09/11/2025
The ChakraCore scripting engine vulnerability identified as CVE-2018-0933 represents a critical memory corruption flaw that affects multiple Microsoft Windows operating systems including Windows 10 versions 1511, 1607, 1703, and 1709 along with Windows Server 2016. This vulnerability resides within the Chakra scripting engine which serves as the JavaScript engine powering Microsoft Edge browser and various other Microsoft applications. The flaw manifests when the engine improperly handles objects in memory, creating conditions that could be exploited by malicious actors to execute arbitrary code remotely. The vulnerability is particularly concerning because it affects the core JavaScript engine that processes web content and scripts across various Microsoft platforms, making it a prime target for attackers seeking to compromise systems through web-based attacks.
The technical nature of this vulnerability falls under the CWE-125 weakness category, which describes out-of-bounds read conditions where a program attempts to access memory beyond the boundaries of a buffer or object. In the context of ChakraCore, this memory corruption occurs during the processing of JavaScript objects, specifically when the engine manages memory allocation and deallocation for dynamic objects created during script execution. The flaw allows attackers to manipulate memory pointers or object references in such a way that they can overwrite critical memory regions or execute malicious code within the context of the running JavaScript engine. This type of vulnerability typically arises from insufficient bounds checking during object manipulation or improper memory management when handling complex JavaScript objects with dynamic properties.
The operational impact of CVE-2018-0933 extends beyond simple remote code execution capabilities, as it provides attackers with a persistent foothold in compromised systems. The vulnerability can be exploited through malicious websites, email attachments containing JavaScript content, or any vector that triggers the Chakra engine to process malicious code. Attackers can leverage this flaw to bypass modern security mechanisms including address space layout randomization and data execution prevention, as the exploitation occurs within the legitimate execution context of the JavaScript engine. The vulnerability's presence across multiple Windows versions and server platforms increases its attack surface significantly, making it a high-priority target for nation-state actors and cybercriminals seeking to establish persistent access to enterprise networks. According to ATT&CK framework, this vulnerability maps to techniques such as T1059.007 for script execution and T1203 for exploitation for privilege escalation.
Mitigation strategies for CVE-2018-0933 require immediate patching of affected systems with Microsoft security updates, as the vulnerability has been addressed through official security releases. Organizations should prioritize patch management procedures to ensure all Windows systems are updated with the relevant security patches, particularly those running affected versions of Windows 10 and Windows Server 2016. Network segmentation and web filtering solutions can provide additional defense-in-depth layers by restricting access to potentially malicious websites and content that might trigger the vulnerability. Browser isolation techniques and sandboxing mechanisms should be implemented to contain potential exploitation attempts within isolated environments. Security monitoring should focus on detecting unusual JavaScript execution patterns or memory access anomalies that might indicate exploitation attempts. Additionally, implementing application whitelisting policies and disabling unnecessary JavaScript functionality in enterprise environments can reduce the attack surface. The vulnerability demonstrates the importance of maintaining up-to-date security patches and the critical role that scripting engine security plays in overall system protection, as these components often serve as attack vectors for sophisticated cyber threats.