CVE-2022-0351 in vim
Summary
by MITRE • 01/25/2022
Access of Memory Location Before Start of Buffer in GitHub repository vim/vim prior to 8.2.
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Analysis
by VulDB Data Team • 03/25/2026
The vulnerability identified as CVE-2022-0351 represents a critical buffer over-read issue affecting the popular vim text editor repository. This flaw exists in versions prior to 8.2 and stems from improper memory access validation during buffer operations. The vulnerability manifests when the software attempts to access memory locations before the beginning of allocated buffers, creating a potential avenue for arbitrary code execution or system compromise. Such memory corruption vulnerabilities are particularly dangerous as they can lead to unpredictable behavior and security breaches when exploited by malicious actors.
The technical implementation of this vulnerability falls under the category of buffer over-read conditions, which are classified as CWE-125 in the Common Weakness Enumeration catalog. This specific weakness occurs when a program reads data from a memory buffer before the beginning of that buffer, potentially accessing uninitialized memory or data belonging to other variables. The flaw typically arises from inadequate bounds checking during memory operations, particularly in functions handling string manipulation, array processing, or input validation within the vim editor's codebase. The vulnerability's impact is exacerbated by the widespread use of vim across various operating systems and development environments, making it an attractive target for exploitation.
Operationally, this vulnerability poses significant risks to system security and stability. When exploited, attackers could potentially execute arbitrary code with the privileges of the affected process, leading to complete system compromise. The memory access violation could also result in denial of service conditions, where the application crashes or becomes unresponsive due to invalid memory access patterns. Given vim's role in system administration, development workflows, and text processing tasks, an attacker who successfully exploits this vulnerability could gain unauthorized access to sensitive system information or manipulate critical configuration files. The vulnerability's exploitation potential aligns with techniques described in the MITRE ATT&CK framework under the T1059.007 subtechnique for command and scripting interpreter, as attackers might leverage compromised vim instances to execute malicious commands.
Mitigation strategies for CVE-2022-0351 primarily focus on immediate software updates and patches provided by the vim development team. System administrators should prioritize upgrading to vim version 8.2 or later, which contains the necessary fixes for this buffer over-read condition. Additionally, implementing proper input validation measures and memory access controls can help reduce the exploitation surface. Organizations should also consider deploying runtime protection mechanisms and monitoring for anomalous memory access patterns that might indicate exploitation attempts. Regular security assessments and vulnerability scanning should be conducted to identify any remaining instances of the vulnerable software within the environment, ensuring comprehensive protection against this and similar memory corruption vulnerabilities.