CVE-2026-50527
Summary
by MITRE • 07/14/2026
Stack-based buffer overflow in .NET Framework allows an unauthorized attacker to deny service over a network.
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Analysis
by VulDB Data Team • 07/14/2026
A stack-based buffer overflow vulnerability within the .NET Framework represents a critical security flaw that enables unauthorized attackers to execute denial of service attacks across network boundaries. This vulnerability stems from improper input validation and memory management practices within the framework's runtime execution environment. The flaw occurs when application code fails to properly bounds-check data before copying it into fixed-size stack buffers, creating opportunities for malicious inputs to overwrite adjacent memory locations. Such vulnerabilities are classified under CWE-121 Stack-based Buffer Overflow, which falls within the broader category of memory safety issues that have historically plagued software systems. The attack vector typically involves sending specially crafted network requests containing oversized data payloads that exceed the allocated buffer size, causing the stack to overflow and potentially corrupt critical execution state information. When exploited successfully, this vulnerability allows attackers to crash application processes, consume excessive system resources, or force applications into unstable states that prevent legitimate users from accessing services. The impact extends beyond simple service disruption as the vulnerability can be leveraged to execute arbitrary code under certain conditions, making it particularly dangerous in enterprise environments where .NET applications handle sensitive data and critical business functions. Network-based exploitation is facilitated by the fact that many .NET applications expose web services or APIs that accept external inputs without adequate validation. This type of vulnerability aligns with ATT&CK technique T1499.004 Network Denial of Service, which specifically addresses attacks targeting network resources to prevent access to services.
The technical implementation of this attack requires minimal privileges and can be executed through standard network communication protocols such as http or tcp connections that interact with vulnerable .NET applications. Attackers typically craft malicious payloads that precisely exceed buffer boundaries, often using techniques like string manipulation or binary data injection to trigger the overflow condition. The vulnerability's exploitation is particularly concerning because .NET Framework is widely deployed across enterprise environments, making it a prime target for attackers seeking to disrupt business operations at scale. When an attacker successfully triggers this buffer overflow, the application process may terminate unexpectedly, leading to service unavailability for legitimate users while potentially creating opportunities for additional attack vectors. The memory corruption that occurs during exploitation can manifest in various ways including segmentation faults, access violations, or application hangs that consume system resources without providing any functional benefit to attackers. This type of denial of service attack can be particularly effective when combined with other techniques such as resource exhaustion attacks, where the attacker consumes multiple system resources simultaneously to maximize impact on availability. The vulnerability's prevalence in .NET environments is further amplified by the framework's extensive use in web applications, enterprise services, and cloud deployments where network accessibility increases attack surface exposure.
Mitigation strategies for this vulnerability require immediate implementation of security patches and updates provided by Microsoft through regular security bulletins and framework updates. Organizations should prioritize patch management processes to ensure all .NET Framework installations receive timely security updates that address known buffer overflow conditions. Application developers must implement proper input validation and bounds checking mechanisms within their code to prevent malicious data from causing buffer overflows during runtime execution. Security measures including network segmentation, intrusion detection systems, and application firewalls can help detect and block suspicious traffic patterns associated with exploitation attempts. Additional defensive controls such as process isolation, resource limits, and automatic failover mechanisms provide layered protection against successful exploitation attempts. Regular security testing including penetration testing and code reviews helps identify potential buffer overflow conditions in custom applications before they can be exploited by attackers. The implementation of runtime protections such as stack canaries, address space layout randomization, and data execution prevention further reduces the likelihood of successful exploitation by making it more difficult for attackers to predict or control memory layout during attack execution. Organizations should also maintain detailed monitoring and logging of application behavior to quickly detect anomalous patterns that may indicate buffer overflow exploitation attempts. Compliance with security standards such as those outlined in the OWASP Top Ten and NIST cybersecurity frameworks provides structured approaches to managing this vulnerability type while ensuring appropriate risk mitigation measures are implemented across the organization's technology infrastructure.