CVE-2020-1376 in Windows
Summary
by MITRE
<p>An elevation of privilege vulnerability exists in the way that fdSSDP.dll handles objects in memory. An attacker who successfully exploited the vulnerability could execute code with elevated permissions.</p> <p>To exploit the vulnerability, a locally authenticated attacker could run a specially crafted application.</p> <p>The security update addresses the vulnerability by ensuring the ssdpsrv.dll properly handles objects in memory.</p>
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Analysis
by VulDB Data Team • 02/24/2026
The vulnerability identified as CVE-2020-1376 represents a critical elevation of privilege flaw within the Windows operating system's implementation of the Simple Service Discovery Protocol. This issue resides in the fdSSDP.dll component which is responsible for handling network service discovery operations. The vulnerability stems from improper memory management practices that allow malicious code execution with elevated privileges, effectively compromising the system's security model. The flaw specifically manifests when the system processes objects in memory during service discovery operations, creating a pathway for unauthorized code execution that bypasses normal permission boundaries.
The technical implementation of this vulnerability falls under CWE-121, which describes heap-based buffer overflow conditions, and more specifically aligns with CWE-787, indicating an out-of-bounds write in heap-based buffers. Attackers can exploit this weakness by crafting a malicious application that leverages the flawed memory handling within fdSSDP.dll. The exploitation requires local authentication, meaning an attacker must already have a valid user account on the target system, but once successful, the payload can execute with system-level privileges. This represents a significant concern within the ATT&CK framework under the T1068 technique for exploit for privilege escalation, where adversaries leverage software vulnerabilities to gain elevated access rights.
The operational impact of CVE-2020-1376 extends beyond simple privilege escalation, as it allows attackers to establish persistent access to compromised systems while potentially bypassing security controls that depend on standard user permissions. The vulnerability affects Windows systems that utilize the SSDP service discovery protocol, which is integral to network operations in enterprise environments. This makes the attack surface particularly broad, as many networked applications and services rely on SSDP for device discovery and service enumeration. The security update provided by Microsoft addresses the root cause by modifying how ssdpsrv.dll handles memory objects, implementing proper bounds checking and memory validation procedures that prevent the out-of-bounds write conditions that enable privilege escalation.
Organizations should prioritize immediate deployment of the Microsoft security update that resolves this vulnerability, as the local authentication requirement does not prevent widespread exploitation in environments where attackers can establish initial access through other means such as phishing attacks or credential theft. The vulnerability demonstrates the importance of proper memory management in system components that handle network traffic, particularly those operating with elevated privileges. Security teams should monitor for any signs of exploitation attempts and implement network segmentation to limit potential lateral movement if the vulnerability is exploited. Additionally, regular security assessments should include verification of proper memory handling in system components, as similar patterns may exist in other parts of the operating system or third-party applications that could present similar attack vectors.