CVE-2021-45105 Security Details

CVE ID

CVE-2021-45105

CWE

CWE-20

CWE-674

CVE Description

Apache Log4j2 versions 2.0-alpha1 through 2.16.0 (excluding 2.12.3 and 2.3.1) did not protect from uncontrolled recursion from self-referential lookups. This allows an attacker with control over Thread Context Map data to cause a denial of service when a crafted string is interpreted. This issue was fixed in Log4j 2.17.0, 2.12.3, and 2.3.1.

Published

Dec 18, 2021

CVSS Score & Severity

5.9Medium

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Score

74.016%

Malware

malware

KEV Status

Not in KEV Catalog: No known exploits

Vulnerable Methods

org/apache/logging/log4j/core/config/AbstractConfiguration.doConfigure()V

JVM

org/apache/logging/log4j/core/config/AbstractConfiguration.initialize()V

JVM

org/apache/logging/log4j/core/config/BaseConfiguration.doConfigure()V

JVM

org/apache/logging/log4j/core/lookup/StrSubstitutor.replace(Lorg/apache/logging/log4j/core/LogEvent;[CII)Ljava/lang/String;

JVMVulnerable params: 0, 1

org/apache/logging/log4j/core/lookup/StrSubstitutor.substitute(Lorg/apache/logging/log4j/core/LogEvent;Ljava/lang/StringBuilder;IILjava/util/List;)I

JVMVulnerable params: 0, 1, 3, 4

Affected Ecosystems

affected

Source

National Vulnerability Database

References

GitHub · CommitPROJECT

Apache Jira · LOG4J2-3230PROJECT