CVE-2021-45105: Apache Log4j2 does not always protect from infinite recursion in lookup evaluation

Security readout for executives and security teams

This Log4j2 flaw can let an attacker who influences certain logging context data crash or stall an affected Java application. It is not described as data theft or remote code execution. The business impact is service disruption, especially where vulnerable Log4j is embedded in internet-facing or high-availability systems. Exposure is likely in Java applications or vendor products bundling affected log4j-core versions, including embedded dependencies. Priority is higher for externally reachable services, shared platforms, and products listed in vendor advisories. Systems already upgraded to 2.17.0, 2.12.3, or 2.3.1 are not indicated as affected. Treat this as a moderate availability risk. It should be remediated through normal emergency patch governance for Log4j-era exposure, with faster handling for public or revenue-critical services. It is not supported by the provided sources as active exploitation or data compromise. Mitigation focus: Upgrade Log4j2 to 2.17.0, 2.12.3, or 2.3.1 as appropriate.; Identify vendor products bundling Log4j and follow each vendor advisory.; Prioritize internet-facing, business-critical, and restart-sensitive Java services..

Prepared

Jun 1, 2026, 02:43 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.