Safety execs say it is one of many worst pc vulnerabilities they’ve ever seen. Corporations together with Microsoft say state-backed Chinese and Iranian hackers and rogue cryptocurrency miners have already seized on it. The Department of Homeland Security has sounded a dire alarm, ordering federal businesses to urgently discover and patch bug cases as a result of it is so simply exploitable — and telling these with public-facing networks to place up firewalls if they can not make certain. A small piece of code, the affected software program typically undocumented. Lodged in an extensively used utility referred to as Log4j,...