CVE-2026-70024 in Windows
Summary
by MITRE • 10/14/2026
Stack-based buffer overflow in Windows Internet Information Services allows an unauthorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability described constitutes a critical security flaw within the Microsoft Windows Internet Information Services, commonly referred to as IIS. This specific issue is classified as a stack-based buffer overflow, which represents one of the most prevalent and dangerous classes of software vulnerabilities in legacy systems. The root cause lies in improper memory management practices during the processing of network requests. When an attacker sends specially crafted data to the affected service, the application fails to adequately validate the length or boundaries of the input before copying it into a fixed-size buffer located on the stack. This lack of bounds checking allows maliciously constructed packets to overwrite adjacent memory locations that are critical for program execution flow.
From a technical perspective, this flaw exploits the way the operating system manages function calls and return addresses on the call stack. By carefully crafting the overflow payload, an attacker can overwrite the saved instruction pointer or frame pointer with arbitrary values. When the vulnerable function attempts to return control to its caller, it instead jumps to the memory address specified by the attacker. This mechanism typically facilitates remote code execution, allowing the adversary to run malicious software with the same privileges as the IIS service account. In many configurations, this privilege level is sufficient to gain full administrative control over the compromised server, enabling further lateral movement within the network infrastructure and potential exfiltration of sensitive data stored on or accessible from that system.
The operational impact of such a vulnerability is severe due to its remote exploitability without requiring user interaction. Attackers can automate the exploitation process using tools like Metasploit or custom scripts, leading to widespread compromise if systems remain unpatched. This aligns with several entries in the MITRE ATT&CK framework, particularly T1190 Exploit Public-Facing Application and T1203 File Execution from Remote Server. The ability to execute code remotely makes this a high-priority target for automated scanning bots and advanced persistent threats seeking initial access vectors against web-facing infrastructure. Historical precedents such as the Code Red and Nimba worms demonstrate how quickly stack-based overflows in IIS can lead to massive internet-wide infections when left unmitigated.
To mitigate this risk, organizations must ensure that all affected versions of Windows Internet Information Services are updated with the latest security patches provided by Microsoft. These updates typically include fixes for memory validation routines and enhanced input sanitization logic within the web server components. Additionally, network-level defenses should be implemented to restrict access to IIS ports from untrusted networks. Web Application Firewalls can also provide a layer of protection by detecting and blocking anomalous request patterns that resemble buffer overflow attempts, such as unusually long headers or malformed HTTP requests. Regular vulnerability scanning and penetration testing are essential to identify any residual exposure in the environment. Maintaining strict patch management policies is crucial for preventing exploitation of known vulnerabilities like this stack-based buffer overflow.