CVE-2023-29326 in .NET Framework
Summary
by MITRE • 06/14/2023
.NET Framework Remote Code Execution Vulnerability
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Analysis
by VulDB Data Team • 05/16/2026
This vulnerability represents a critical remote code execution flaw within the .NET Framework that allows attackers to execute arbitrary code on affected systems without authentication. The vulnerability stems from improper input validation and handling of specific data types within the framework's runtime components, particularly affecting how the system processes serialized objects and handles certain method calls. The flaw exists in the underlying runtime engine that manages .NET applications, making it a foundational security issue that impacts countless enterprise applications and services. According to CWE-121, this vulnerability involves stack-based buffer overflow conditions that occur when the system fails to properly validate input parameters before processing them. The attack vector typically leverages maliciously crafted inputs that trigger the vulnerable code path during deserialization operations or when processing untrusted data streams.
The operational impact of this vulnerability extends across multiple attack surfaces within enterprise environments where .NET applications are deployed. Systems running affected versions of the .NET Framework become immediately susceptible to exploitation, potentially allowing attackers to gain full system compromise and execute malicious payloads with the privileges of the affected application. The vulnerability affects both client and server-side applications, creating widespread exposure across enterprise networks where .NET applications are prevalent. Organizations using legacy applications or those that have not applied security patches face severe risk of unauthorized access, data breaches, and potential lateral movement within their network infrastructure. The attack chain often follows the pattern described in the MITRE ATT&CK framework under technique T1203, where adversaries leverage remote access capabilities to establish persistent access and escalate privileges.
Mitigation strategies for this vulnerability require immediate patch application across all affected systems, with particular emphasis on prioritizing critical infrastructure and high-value targets within the organization's attack surface. Security teams should implement network segmentation and access controls to limit the potential impact of successful exploitation attempts, while also monitoring for suspicious network traffic patterns that may indicate exploitation activity. The remediation process must include comprehensive vulnerability scanning to identify all systems running affected .NET Framework versions, followed by coordinated patch deployment and system validation. Organizations should also consider implementing application whitelisting policies and runtime application protection mechanisms to reduce the attack surface. Additionally, security monitoring solutions should be configured to detect anomalous behavior patterns associated with exploitation attempts, including unusual outbound connections or unexpected process creation activities that align with the attack patterns documented in the ATT&CK framework's T1059 category for command and scripting interpreter execution.