CVE-2023-1127 in vim
Summary
by MITRE • 03/01/2023
Divide By Zero in GitHub repository vim/vim prior to 9.0.1367.
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Analysis
by VulDB Data Team • 08/11/2025
The vulnerability identified as CVE-2023-1127 represents a critical divide by zero error within the vim text editor repository maintained by GitHub. This issue affects versions prior to 9.0.1367 and stems from improper input validation during arithmetic operations within the software's codebase. The flaw manifests when the vim editor processes specific input sequences that trigger division operations with zero as the divisor, leading to potential system instability and denial of service conditions. Such vulnerabilities are particularly dangerous in text editing environments where users may process untrusted content, as they can be exploited to disrupt normal operations or potentially escalate privileges through carefully crafted input sequences.
The technical nature of this vulnerability aligns with CWE-369, which specifically addresses divide by zero conditions in software implementations. This weakness occurs when a program performs division operations without properly validating that the divisor is non-zero, creating a scenario where the arithmetic operation fails catastrophically. In the context of vim, this issue likely emerges during parsing of configuration files, script execution, or processing of malformed input data streams that contain mathematical expressions or data structures requiring division operations. The vulnerability demonstrates poor defensive programming practices where essential boundary checks and input sanitization mechanisms are either missing or inadequately implemented.
From an operational impact perspective, this divide by zero vulnerability creates significant risks for organizations relying on vim as their primary text editing solution. When exploited, the vulnerability can cause the vim editor to crash or terminate unexpectedly, resulting in denial of service for legitimate users who require text editing capabilities. The potential for privilege escalation exists in scenarios where vim is executed with elevated permissions or when the editor processes user input from untrusted sources. Attackers could leverage this weakness to disrupt critical workflows, particularly in server environments where vim serves as a standard tool for system administration tasks. The vulnerability's impact extends beyond simple service disruption to potentially enable more sophisticated attack vectors through cascading failures in dependent systems.
The remediation approach for CVE-2023-1127 requires immediate application of the patch released in vim version 9.0.1367, which implements proper validation checks to prevent division operations with zero divisors. Organizations should prioritize updating their vim installations across all systems where the editor is deployed, particularly in production environments where availability is critical. System administrators should also implement monitoring solutions to detect potential exploitation attempts and establish baseline configurations that prevent unnecessary execution of untrusted scripts or input processing within vim. Additionally, implementing proper input validation at multiple layers of the application stack can provide defense in depth against similar vulnerabilities. The fix demonstrates the importance of maintaining current software versions and implementing robust error handling mechanisms that prevent arithmetic exceptions from causing system-wide failures. This vulnerability underscores the necessity of adhering to secure coding practices and following established frameworks such as the CWE guidelines to prevent fundamental arithmetic errors that can compromise system integrity and availability.