Although this is mainly for enterprise users, ANY, HP printer users who use Future Smart 5.6 should revert to version 5.5.0.3 immediately.
"Certain HP Enterprise LaserJet and HP LaserJet Managed Printers are potentially vulnerable to information disclosure when IPsec is enabled with Future Smart version 5.6"
https://www.msn.com/en-us/news/technology/hp-laserjet-printers-have-a-critical-security-bug-and-there-s-nothing-you-can-do-for-now/ar-AA19voVb?ocid=winpstoreapp&cvid=bbc8800dbcdd44bb9f6dbdc93f7d9c93&ei=14