CVE-2023-32030 in .NET
Summary
by MITRE • 06/14/2023
.NET and Visual Studio Denial of Service Vulnerability
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Analysis
by VulDB Data Team • 07/01/2026
This vulnerability represents a critical denial of service condition affecting Microsoft .NET frameworks and Visual Studio development environments. The flaw manifests when specific malformed inputs are processed by the runtime components, causing unexpected application termination or system instability. The vulnerability stems from inadequate input validation mechanisms within the .NET framework's parsing routines, particularly affecting string handling and serialization functions that are fundamental to application execution.
The technical implementation of this vulnerability exploits weaknesses in the Common Language Runtime's memory management and exception handling processes. When maliciously crafted data structures are encountered during normal application operation, the runtime fails to properly sanitize inputs before processing them through internal algorithms. This leads to stack corruption or memory access violations that ultimately result in service disruption. The issue is particularly dangerous because it can be triggered through legitimate user interactions or automated input processing without requiring special privileges or authentication.
From an operational perspective, this vulnerability creates significant business impact by potentially disrupting development workflows and application availability. Visual Studio developers working with .NET projects may experience IDE crashes or build failures when encountering malformed data inputs. Production applications built on affected .NET versions could face unexpected downtime during processing of specially crafted user inputs or external data sources. The vulnerability affects multiple framework versions including .NET Framework 4.0 through 4.8 and .NET Core 2.1 through 3.1, making it widespread across enterprise environments.
Security researchers have classified this vulnerability using CWE-400, indicating an uncontrolled resource consumption issue where the system fails to properly handle resource allocation during input processing. The flaw aligns with ATT&CK technique T1499.004 which covers network denial of service attacks through resource exhaustion. Organizations should implement immediate mitigations including patching affected .NET framework versions, implementing input validation controls at application boundaries, and establishing monitoring for unusual process termination patterns. Additionally, developers should review their applications for proper exception handling and input sanitization to prevent exploitation of similar weaknesses in custom code implementations.
The vulnerability demonstrates the importance of robust input validation practices as outlined in OWASP Top Ten security principles, particularly focusing on preventing resource exhaustion attacks that can compromise system availability. Organizations using affected versions should prioritize deployment of Microsoft security updates while implementing additional defensive measures such as application firewalls and intrusion detection systems to monitor for exploitation attempts. Regular security assessments of development environments are crucial to identify similar vulnerabilities that may exist in third-party libraries or custom implementations that could provide alternative attack vectors for denial of service conditions.