CVE-2026-17639 in Smart Tank 5101 All-in-One Printer
Summary
by MITRE • 08/17/2026
Certain HP Smart Tank All-in-One printers may be potentially vulnerable to a denial of service condition that allows an unauthenticated attacker to cause the device to become unavailable by sending multiple concurrent HTTP requests.
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Analysis
by VulDB Data Team • 08/17/2026
The vulnerability described affects certain models of HP Smart Tank all-in-one printers, presenting a significant risk to operational continuity through a denial of service mechanism. This flaw is rooted in how the printer's embedded web server or network interface handles incoming traffic from unauthenticated users. Specifically, the device fails to implement adequate rate limiting, connection throttling, or resource management protocols when processing concurrent HTTP requests. An attacker who can reach the printer over the local network or potentially via the internet if exposed does not need valid credentials to exploit this weakness. By flooding the target device with a high volume of simultaneous connections or request packets, the attacker overwhelms the limited computational resources and memory buffers allocated for handling web traffic on the embedded system.
From a technical perspective, this issue aligns closely with CWE-400, which classifies uncontrolled resource consumption vulnerabilities. The printer's firmware likely lacks robust safeguards to detect and mitigate rapid bursts of network activity from single or distributed sources. When multiple HTTP requests are processed concurrently without proper queuing or rejection mechanisms, the system may exhaust its available memory, CPU cycles, or socket handles. This exhaustion leads to a state where the device can no longer process legitimate administrative commands or user print jobs effectively. In severe cases, this resource depletion forces the printer into an unresponsive state, requiring a manual power cycle or hard reset to restore functionality, thereby disrupting any workflow dependent on that specific hardware asset.
The operational impact of this vulnerability extends beyond simple inconvenience. For environments relying heavily on networked printing services, such as small offices or home workspaces where these printers are commonly deployed, the inability to access print queues can halt productivity. Furthermore, if an attacker repeatedly triggers this denial of service condition, it may lead to accelerated hardware wear due to frequent reboots or cause data corruption in temporary storage buffers used during request processing. The lack of authentication requirement makes this vulnerability particularly dangerous as it lowers the barrier for entry significantly, allowing any network user with basic networking knowledge to execute the attack without needing prior access privileges or social engineering tactics.
In terms of threat modeling and industry standards, this behavior is consistent with techniques found in MITRE ATT&CK framework under Denial of Service categories, specifically those involving resource exhaustion through application layer flooding. The vulnerability represents a classic example of insufficient input validation and state management in embedded IoT devices where security features are often deprioritized to reduce cost or complexity. Attackers can leverage this for disruptive purposes or potentially as a distraction technique while attempting other malicious activities on the network segment, although the primary impact here is availability loss rather than confidentiality or integrity compromise.
Mitigation strategies should focus on both immediate remediation and long-term architectural improvements. Users are advised to ensure their HP Smart Tank printers have the latest firmware updates installed, as vendors typically release patches that address such resource management flaws by implementing stricter connection limits and improved error handling for malformed or excessive traffic. Network administrators can also deploy firewall rules or access control lists on routers to restrict HTTP port access (typically port 80) to only trusted IP addresses within the local network segment, thereby preventing unauthenticated external actors from reaching the vulnerable service interface. Additionally, placing printers in a segregated VLAN with limited outbound and inbound traffic policies reduces the attack surface significantly. Until patches are applied or network controls are enforced, monitoring for unusual spikes in HTTP request rates can help identify active exploitation attempts early enough to mitigate their impact on system availability.