CVE-2025-49722 in Windows
Summary
by MITRE • 07/08/2025
Uncontrolled resource consumption in Windows Print Spooler Components allows an authorized attacker to deny service over an adjacent network.
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Analysis
by VulDB Data Team • 08/05/2026
This vulnerability represents a significant denial of service weakness within the Windows Print Spooler subsystem that can be exploited by attackers with network access to affected systems. The issue stems from inadequate resource management within the print queue processing mechanisms, where maliciously crafted print jobs or print server requests can cause excessive memory allocation and CPU consumption. According to CWE-400, this falls under uncontrolled resource consumption, a category that encompasses various resource exhaustion vulnerabilities where attacker-controlled inputs lead to system instability or complete service disruption. The vulnerability specifically affects the print spooler components that handle print job processing, driver installation, and printer communication protocols.
The technical flaw manifests when legitimate print requests are processed through the spooler service without proper input validation or resource limiting mechanisms. Attackers can exploit this by submitting specially crafted print jobs that either contain malformed data structures or trigger recursive processing loops within the print queue management system. This leads to continuous memory allocation and processor utilization that eventually exhausts available system resources, causing the print spooler service to become unresponsive or crash entirely. The vulnerability is particularly dangerous because it operates at the system level where the print spooler service typically runs with elevated privileges, making successful exploitation capable of causing broader system instability.
From an operational perspective, this vulnerability creates significant risk for enterprise environments where print servers are commonly used as central points of access for multiple network users. Network attackers can leverage this weakness to disrupt printing services across entire departments or facilities, potentially causing business interruptions that extend beyond simple document processing failures. The impact is amplified in scenarios where critical systems depend on printing capabilities for operational functions such as receipt generation, label printing, or report production. According to ATT&CK framework domain T1499, this represents a denial of service technique that can be used to disrupt availability of services and resources. The adjacent network requirement means that attackers must be positioned within the same broadcast domain or have access to the network segment containing the vulnerable print servers.
Mitigation strategies should focus on implementing proper resource limits and input validation within the print spooler service configuration. Organizations should configure print server settings to limit concurrent print jobs, implement memory usage thresholds, and establish proper access controls that restrict who can submit print jobs to critical print servers. Network segmentation techniques can help reduce exposure by isolating print servers from general network traffic and implementing firewall rules that restrict printer communication protocols. Additionally, regular monitoring of print spooler service resource consumption and implementing automated alerting for unusual resource usage patterns can help detect exploitation attempts before they cause significant disruption. The vulnerability highlights the importance of proper resource management in system services and demonstrates how seemingly minor implementation flaws can create substantial availability risks when exploited by determined attackers.