Apache Log4j's JsonTemplateLayout https://logging.apache.org/log4j/2.x/manual/json-template-layout.html , in versions up to and including 2.25.3, produces invalid JSON output when log events contain non-finite floating-point values (NaN, Infinity, or -Infinity), which are prohibited by RFC 8259. This may cause downstream log processing systems to reject or fail to index affected records.
An attacker can exploit this issue only if both of the following conditions are met:
Users are advised to upgrade to Apache Log4j JSON Template Layout 2.25.4, which corrects this issue.
Exploitability
AV:NAC:HAT:PPR:NUI:NVulnerable System
VC:NVI:NVA:NSubsequent System
SC:NSI:LSA:N6.3/CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:NInput Validation