Log4j (English Wikipedia)

"Apache Log4j 1.2 Release History". apache.org. Apache Software Foundation. Retrieved September 2, 2014.
"Release Notes - Log4j". logging.apache.org. Retrieved October 9, 2023.
"Log4j 2 Guide - Apache Log4j 2". Logging.apache.org. July 12, 2014. Retrieved July 24, 2014.
"Log4j 2 Guide - Apache Log4j 2: News". Logging.apache.org. July 12, 2014. Retrieved July 24, 2014.
"Log4j – Overview - Apache Log4j 2". logging.apache.org. June 5, 2016. Retrieved July 3, 2016.
"Log4j 2 Asynchronous Loggers for Low-Latency Logging - Apache Log4j 2". Logging.apache.org. July 12, 2014. Retrieved July 24, 2014.
"Level (Apache Log4j 1.2.17 API)". Logging.apache.org. June 9, 2012. Retrieved July 24, 2014.
"Custom Log Levels". Logging.apache.org. July 12, 2014. Retrieved July 16, 2016.
"Configuration". Logging.apache.org. July 5, 2016. Retrieved July 16, 2016.
"Architecture". Logging.apache.org. July 5, 2016. Retrieved July 16, 2016.
"Appenders". Logging.apache.org. July 5, 2016. Retrieved July 16, 2016.
"Layouts". Logging.apache.org. July 5, 2016. Retrieved July 16, 2016.
"Filters". Logging.apache.org. July 5, 2016. Retrieved July 16, 2016.
"TTCCLayout (Apache Log4j 1.2.17 API)". Logging.apache.org. June 9, 2012. Retrieved July 24, 2014.
"MDC (Apache Log4j 1.2.17 API)". Logging.apache.org. June 9, 2012. Retrieved July 24, 2014.
"Apache log4net". Logging.apache.org. Retrieved December 11, 2021.
"Apache Logging Services". Apache.org. Retrieved March 11, 2015.
"log4cxx - Changelog". logging.apache.org.
"Apache Log4j Security Vulnerabilities". December 6, 2021.

issues.apache.org

"LOG4J2-3208: Disable JNDI by default". December 11, 2021. Retrieved December 14, 2021.
"LOG4J2-3211: Remove support for Lookups in messages". December 13, 2021. Retrieved December 14, 2021.

blogs.apache.org

"Apache Logging Services Project Announces Log4j 1 End-Of-Life; Recommends Upgrade to Log4j 2". blogs.apache.org. August 5, 2015. Retrieved July 3, 2016.

people.apache.org

"Class NDC". Archived from the original on August 20, 2007. Retrieved December 11, 2021.

arstechnica.com (Global: 473^rd place; English: 338^th place)

Goodin, Dan (December 9, 2021). "Zeroday in ubiquitous Log4j tool poses a grave threat to the Internet". Ars Technica. Retrieved December 10, 2021.

bund.de (Global: 2,223^rd place; English: 5,910^th place)

bsi.bund.de

"Warnstufe Rot: Schwachstelle Log4Shell führt zu extrem kritischer Bedrohungslage" [Red alarm: Log4Shell vulnerability causes extremely critical threat situation]. BSI press service (in German). December 12, 2021.

cisa.gov (Global: low place; English: low place)

"Statement from CISA Director Easterly on "Log4j" Vulnerability". CISA. Washington. December 11, 2021.

cyber.gc.ca (Global: low place; English: low place)

"Statement from the Minister of National Defence on Apache Vulnerability and Call to Canadian Organizations to Take Urgent Action". Government of Canada. December 12, 2021. Archived from the original on December 20, 2021. Retrieved December 12, 2021.

cyberkendra.com (Global: low place; English: low place)

"Worst Apache Log4j RCE Zero day Dropped on Internet". Cyber Kendra. December 9, 2021. Retrieved December 10, 2021.

doi.org (Global: 2^nd place; English: 2^nd place)

Gerhards, R. (March 1, 2009). "RFC 5424 - The Syslog Protocol". tools.ietf.org. doi:10.17487/RFC5424. Retrieved July 16, 2016. {{cite journal}}: Cite journal requires |journal= (help)

github.com (Global: 380^th place; English: 337^th place)

"Release 2.26.1". July 2, 2026. Retrieved July 3, 2026.
"stritti/Log4js - The Logging Framework for JavaScript with no runtime dependencies". GitHub. Retrieved December 11, 2021.
"tmuth/Logger-A-PL-SQL-Logging-Utility — GitHub". Github.com. Retrieved July 24, 2014.
"LOG4J2-3198: Log4j2 no longer formats lookups in messages by default". GitHub. December 5, 2021.
"Restrict LDAP access via JNDI by rgoers · Pull Request #608 · apache/logging-log4j2". GitHub. 30 November–5 December 2021

graylog.org (Global: low place; English: low place)

docs.graylog.org

"GELF". docs.graylog.org. June 8, 2016. Archived from the original on February 9, 2020. Retrieved July 16, 2016.

grobmeier.de (Global: low place; English: low place)

"The new log4j 2.0". Grobmeier.de. December 5, 2012. Retrieved July 24, 2014.

ietf.org (Global: 731^st place; English: 625^th place)

tools.ietf.org

Gerhards, R. (March 1, 2009). "RFC 5424 - The Syslog Protocol". tools.ietf.org. doi:10.17487/RFC5424. Retrieved July 16, 2016. {{cite journal}}: Cite journal requires |journal= (help)

jsnlog.com (Global: low place; English: low place)

"Logging JavaScript errors to your server side log". JSNLog. Retrieved December 11, 2021.

lawfaremedia.org (Global: low place; English: 6,997^th place)

"What's the Deal with the Log4Shell Security Nightmare?". Lawfare. December 10, 2021.

lmax-exchange.github.io (Global: low place; English: low place)

"Disruptor by LMAX-Exchange". Lmax-exchange.github.io. Retrieved July 24, 2014.

log4javascript.org (Global: low place; English: low place)

"a JavaScript logging framework". log4javascript. Retrieved December 11, 2021.

minecraft.net (Global: low place; English: low place)

help.minecraft.net

"Security Vulnerability in Minecraft: Java Edition". Minecraft. December 10, 2021.

mschilli.github.io (Global: low place; English: low place)

Schilli, Mike; Goess, Kevin. "log4perl - log4j for Perl". log4perl. Retrieved December 11, 2021.

oracle.com (Global: 2,532^nd place; English: 1,847^th place)

docs.oracle.com

"RandomAccessFile". docs.oracle.com. July 28, 2011. Retrieved July 16, 2016.

pcmag.com (Global: 1,442^nd place; English: 915^th place)

Mott, Nathaniel (December 10, 2021). "Countless Servers Are Vulnerable to Apache Log4j Zero-Day Exploit". PC Magazine. Retrieved December 10, 2021.

qos.ch (Global: low place; English: low place)

reload4j.qos.ch

"Reload4j Home". reload4j.qos.ch. Retrieved January 12, 2022.
"Reload4j Project; Easy migration from log4j 1.2.x". qos.ch. January 12, 2022. Retrieved January 12, 2022.

logback.qos.ch

"Logback Home". Logback.qos.ch. Retrieved July 24, 2014.

ralphgoers.com (Global: low place; English: low place)

Goers, Ralph (December 15, 2019). "Why was Log4j 2 created?". Ralph Goers.

rubyforge.org (Global: low place; English: low place)

log4r.rubyforge.org

"Log4r Manual". log4r.rubyforge.org. Retrieved April 13, 2017.{{cite web}}: CS1 maint: deprecated archival service (link)

sonatype.com (Global: low place; English: low place)

blog.sonatype.com

Grigg, Kadi (February 4, 2022). "Wicked Good Development - Cybersecurity Experts Talk Log4J, Open Source and More". blog.sonatype.com. Retrieved August 16, 2022.

sourceforge.net (Global: 1,842^nd place; English: 1,520^th place)

"Logging Framework for C | Free System Administration software downloads at". Sourceforge.net. Retrieved July 24, 2014.

tagesschau.de (Global: 772^nd place; English: 2,796^th place)

"BSI warnt vor Sicherheitslücke" [BSI warns of security vulnerabilities]. Tagesschau (in German). December 12, 2021.

theguardian.com (Global: 16^th place; English: 11^th place)

"Recently uncovered software flaw 'most critical vulnerability of the last decade'". the Guardian. Associated Press. December 11, 2021.

web.archive.org (Global: 1^st place; English: 1^st place)

"GELF". docs.graylog.org. June 8, 2016. Archived from the original on February 9, 2020. Retrieved July 16, 2016.
"Class NDC". Archived from the original on August 20, 2007. Retrieved December 11, 2021.
"Statement from the Minister of National Defence on Apache Vulnerability and Call to Canadian Organizations to Take Urgent Action". Government of Canada. December 12, 2021. Archived from the original on December 20, 2021. Retrieved December 12, 2021.

wired.com (Global: 254^th place; English: 178^th place)

Newman, Lily Hay (December 10, 2021). "The Internet Is on Fire". Wired – via www.wired.com.

Log4j (English Wikipedia)

angoca.github.io (Global: low place; English: low place)

apache.org (Global: 4,440th place; English: 3,599th place)

logging.apache.org

issues.apache.org

blogs.apache.org

people.apache.org

arstechnica.com (Global: 473rd place; English: 338th place)

bund.de (Global: 2,223rd place; English: 5,910th place)

bsi.bund.de

cisa.gov (Global: low place; English: low place)

cyber.gc.ca (Global: low place; English: low place)

cyberkendra.com (Global: low place; English: low place)

doi.org (Global: 2nd place; English: 2nd place)

github.com (Global: 380th place; English: 337th place)

graylog.org (Global: low place; English: low place)

docs.graylog.org

grobmeier.de (Global: low place; English: low place)

ietf.org (Global: 731st place; English: 625th place)

tools.ietf.org

jsnlog.com (Global: low place; English: low place)

lawfaremedia.org (Global: low place; English: 6,997th place)

lmax-exchange.github.io (Global: low place; English: low place)

log4javascript.org (Global: low place; English: low place)

minecraft.net (Global: low place; English: low place)

help.minecraft.net

mschilli.github.io (Global: low place; English: low place)

oracle.com (Global: 2,532nd place; English: 1,847th place)

docs.oracle.com

pcmag.com (Global: 1,442nd place; English: 915th place)

qos.ch (Global: low place; English: low place)

reload4j.qos.ch

logback.qos.ch

ralphgoers.com (Global: low place; English: low place)

rubyforge.org (Global: low place; English: low place)

log4r.rubyforge.org

sonatype.com (Global: low place; English: low place)

blog.sonatype.com

sourceforge.net (Global: 1,842nd place; English: 1,520th place)

tagesschau.de (Global: 772nd place; English: 2,796th place)

theguardian.com (Global: 16th place; English: 11th place)

web.archive.org (Global: 1st place; English: 1st place)

wired.com (Global: 254th place; English: 178th place)

apache.org (Global: 4,440^th place; English: 3,599^th place)

arstechnica.com (Global: 473^rd place; English: 338^th place)

bund.de (Global: 2,223^rd place; English: 5,910^th place)

doi.org (Global: 2^nd place; English: 2^nd place)

github.com (Global: 380^th place; English: 337^th place)

ietf.org (Global: 731^st place; English: 625^th place)

lawfaremedia.org (Global: low place; English: 6,997^th place)

oracle.com (Global: 2,532^nd place; English: 1,847^th place)

pcmag.com (Global: 1,442^nd place; English: 915^th place)

sourceforge.net (Global: 1,842^nd place; English: 1,520^th place)

tagesschau.de (Global: 772^nd place; English: 2,796^th place)

theguardian.com (Global: 16^th place; English: 11^th place)

web.archive.org (Global: 1^st place; English: 1^st place)

wired.com (Global: 254^th place; English: 178^th place)