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veracodeVeracode Vulnerability DatabaseVERACODE:33337
HistoryDec 15, 2021 - 12:30 a.m.

Denial Of Service (DoS)

2021-12-1500:30:50
Veracode Vulnerability Database
sca.analysiscenter.veracode.com
99

0.976 High

EPSS

Percentile

100.0%

log4j-core is vulnerable to denial of service (DoS). The vulnerability exists because previous mitigation for CVE-2021-44228 is incomplete in certain non-default configurations. An attacker can send a malicious Thread Context Map (MDC) input data in JNDI Lookup pattern using a non-default Pattern Layout in logging configuration with either a Context Lookup (for example, $${ctx:loginId}) or a Thread Context Map pattern (%X, %mdc, or %MDC), causing denial of service using JNDI Lookup pattern. This is a different vulnerability which cannot be fixed using previously suggested configuration such as to set the system property log4j2.noFormatMsgLookup to true.

References