CVE-2026-42626
MediumCVSS 5.9Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
HP ENVY 5000 series printers with firmware VERBASPP1N003.2237A.00 do not properly manage concurrent TCP connections to port 9100 (JetDirect/RAW). An unauthenticated remote attacker on the same network can establish a persistent connection and send keep-alive packets, locking session threads. Lack of connection timeouts and session limits results in a persistent denial of service requiring physical intervention (manual restart) to restore functionality.
Risk Assessment
The attack can completely disable the printer, preventing printing and requiring physical intervention, leading to extended downtime.
Recommendation
Update the printer firmware to the latest version and restrict access to port 9100 to trusted hosts using a firewall.
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Original NVD description (English source)
HP ENVY 5000 series printers VERBASPP1N003.2237A.00 do not properly manage concurrent TCP connections to port 9100 (JetDirect/RAW printing). An unauthenticated remote attacker on the same network can establish a persistent connection to port 9100 and send keep-alive packets, causing the printer's session threads to remain locked in a waiting state. The firmware lacks connection timeouts and concurrent session limits, resulting in a persistent Denial of Service (DoS) that renders the printer unresponsive to all user commands and print jobs. Physical intervention (manual restart) is required to restore functionality, and the attack can be immediately re-initiated.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

