Buffer overflow in network printers

A buffer overflow in the network printer’s print-protocol parser; the device may crash or run attacker code.

Summary

Printer firmware does not process long print-job headers properly. An attacker on the same network can crash the device or gain persistence.

Impact

Because printers are rarely monitored they become a hidden foothold for attackers.

Recommendation

Place printers on a separate VLAN, disable unnecessary protocols and update firmware.

Recommended actions

Create a printer VLAN
Disable RAW/LPD protocols
Plan the firmware update

Monitor

CVE ID: CVE-2026-30871
Severity: Medium
CVSS score: 5.9 /10
Published: 22 September 2026
Affected system type: Operating system
Patch status: Workaround only
Active exploitation: Not observed
Affected product/version: Corporate network printers, 4.x firmware

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