CVE-2022-2042 in vim
Summary
by MITRE • 06/10/2022
Use After Free in GitHub repository vim/vim prior to 8.2.
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Analysis
by VulDB Data Team • 05/24/2026
The vulnerability identified as CVE-2022-2042 represents a critical use-after-free condition affecting the popular Vim text editor software. This flaw exists within the github repository vim/vim and specifically impacts versions prior to 8.2. The issue stems from improper memory management during the handling of certain buffer operations, creating a scenario where freed memory locations are still accessed by subsequent operations. Such vulnerabilities are particularly dangerous as they can lead to arbitrary code execution or system compromise when exploited by malicious actors. The vulnerability is categorized under CWE-416, which specifically addresses the use of freed memory, making it a well-documented and severe class of memory corruption flaws.
The technical implementation of this use-after-free vulnerability occurs during the processing of specific buffer operations within the Vim editor's memory management system. When the editor handles certain file operations or buffer manipulations, it fails to properly invalidate pointers after memory deallocation, allowing subsequent code paths to reference already freed memory blocks. This particular flaw manifests when the editor processes files with specific characteristics that trigger the problematic code path, often involving complex buffer operations or file handling scenarios. The vulnerability is particularly insidious because it can be triggered through normal editor usage, making it accessible to both legitimate users and attackers who might craft malicious files to exploit the condition.
The operational impact of CVE-2022-2042 extends beyond simple memory corruption, as it creates opportunities for remote code execution and system compromise. Attackers can leverage this vulnerability by crafting malicious files or manipulating existing files in ways that trigger the flawed memory handling code path. The potential for arbitrary code execution makes this vulnerability particularly attractive to threat actors seeking to gain unauthorized access to systems running vulnerable versions of Vim. The impact is significant across various deployment scenarios including development environments, server systems, and any platform where Vim serves as a primary text editing solution. Organizations using older versions of Vim without proper patching are at heightened risk of exploitation, especially in environments where users might encounter untrusted files or documents.
Mitigation strategies for CVE-2022-2042 focus primarily on immediate patching and version updates to the Vim editor software. System administrators should prioritize updating all installations to Vim version 8.2 or later, which contains the necessary fixes for this memory management issue. Additionally, implementing proper input validation and sanitization measures can help reduce the attack surface by preventing potentially malicious files from triggering the vulnerable code paths. Network segmentation and access controls should be enforced to limit exposure of systems running vulnerable versions. The vulnerability aligns with ATT&CK technique T1059, which involves the execution of malicious code through legitimate system processes, making it important to monitor for unusual execution patterns. Organizations should also consider implementing automated patch management systems to ensure timely deployment of security updates and prevent similar vulnerabilities from accumulating in their software environments.