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CVE-2021-45105

Good to know:

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Date: December 18, 2021

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.

Language: Java

Severity Score

Related Resources (21)

https://nvd.nist.gov/vuln/detail/CVE-2021-45105
https://www.debian.org/security/2021/dsa-5024
https://logging.apache.org/log4j/2.x/security.html
https://lists.debian.org/debian-lts-announce/2021/12/msg00017.html
https://www.zerodayinitiative.com/advisories/ZDI-21-1541/
https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdf
https://www.oracle.com/security-alerts/cpujan2022.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EOKPQGV24RRBBI4TBZUDQMM4MEH7MXCY/
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-45105
https://cert-portal.siemens.com/productcert/pdf/ssa-501673.pdf
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SIG7FZULMNK2XF6FZRU4VWYDQXNMUGAJ/
https://security-tracker.debian.org/tracker/CVE-2021-45105
https://www.oracle.com/security-alerts/cpuapr2022.html
https://security.netapp.com/advisory/ntap-20211218-0001/
https://www.oracle.com/security-alerts/cpujul2022.html
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbd
https://issues.apache.org/jira/browse/LOG4J2-3230
http://www.openwall.com/lists/oss-security/2021/12/19/1
https://www.kb.cert.org/vuls/id/930724
https://www.mend.io/vulnerability-database/CVE-2021-45105

Severity Score

Weakness Type (CWE)

Input Validation

CWE-20

Uncontrolled Resource Consumption ('Resource Exhaustion')

CWE-400

Uncontrolled Recursion

CWE-674

Top Fix

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Upgrade Version

Upgrade to version org.apache.logging.log4j:log4j-core:2.3.1,2.12.3,2.17.0;org.ops4j.pax.logging:pax-logging-log4j2:1.11.10,2.0.11

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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