CVE-2026-58547
Summary
by MITRE • 07/14/2026
Heap-based buffer overflow in Universal Plug and Play (upnp.dll) allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 07/14/2026
A heap-based buffer overflow vulnerability exists within the Universal Plug and Play component of the Windows operating system, specifically within the upnp.dll library. This vulnerability represents a critical security flaw that can be exploited by an authenticated local attacker to achieve privilege escalation on affected systems. The issue stems from improper input validation and memory management within the upnp.dll module which handles UPnP protocol operations and device discovery mechanisms. When processing malformed or excessively large data inputs through UPnP interfaces, the vulnerable code fails to properly bounds-check heap-allocated buffers, leading to memory corruption that can be leveraged for arbitrary code execution.
The technical implementation of this vulnerability involves the exploitation of heap memory allocation patterns where insufficient size validation occurs during buffer operations. This flaw aligns with CWE-121 Heap-based Buffer Overflow, which specifically addresses buffer overflows occurring in heap memory regions rather than stack-based allocations. The vulnerability is particularly concerning because it requires only local authentication to exploit, meaning any user account on the system can potentially leverage this weakness. Attackers can craft malicious UPnP requests or manipulate existing UPnP services to trigger the buffer overflow condition, which then allows them to overwrite adjacent heap memory locations and potentially redirect execution flow.
From an operational impact perspective, this vulnerability poses significant risks to enterprise environments where Windows systems are deployed with UPnP enabled. The privilege escalation capability means that an attacker who initially gains access through legitimate user credentials can elevate their privileges to SYSTEM level, providing complete control over affected machines. This makes the vulnerability particularly dangerous in scenarios where users have local access to systems or where UPnP services are exposed through network boundaries. The attack surface is broadened by the widespread use of UPnP across various Windows versions and system configurations, making it an attractive target for adversaries seeking persistent access and elevated privileges within compromised environments.
The mitigation strategies for this vulnerability encompass both immediate remediation actions and longer-term architectural considerations. Microsoft has released security updates addressing this specific flaw through regular patch management procedures, which should be prioritized for deployment across all affected systems. System administrators should implement network segmentation to limit UPnP service exposure and disable unnecessary UPnP functionality on systems where it is not required. Additionally, implementing application whitelisting controls and monitoring for unusual UPnP activity can help detect exploitation attempts. From a defensive perspective, this vulnerability maps to several ATT&CK techniques including privilege escalation via exploitation of software vulnerabilities and defense evasion through manipulation of system services. Organizations should also consider implementing comprehensive endpoint detection and response solutions that can monitor for heap corruption patterns and anomalous memory allocation behaviors indicative of buffer overflow exploitation attempts.