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The Log4j Zero-Day: What We Know So Far

ID: cd22698f-df0c-5de9-98b4-f1737798aaa8

STIX ID: report--cd22698f-df0c-5de9-98b4-f1737798aaa8

Feed Name: ReliaQuest Blog

Threat Score
92/100

Date Published: 2021-12-10

Date Updated: 2026-04-29

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The report details the critical Log4j (CVE-2021-44228, "Log4Shell") zero-day allowing unauthenticated RCE across many Java-based services, notes rapid release of PoC code and active exploitation/scanning, summarizes vendor mitigations and community detection rules, and provides patching, configuration mitigations, IOC/detection queries, and incident response priorities.

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