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  2. The Log4j vulnerability, also known as Log4Shell, is a critical vulnerability discovered in the Apache Log4j logging library in November 2021. Log4Shell essentially grants hackers total control of devices running unpatched versions of Log4j. Malicious actors can use the Log4j flaw to run almost any code they want on vulnerable systems.

    What is the Log4j Vulnerability? | IBM

    www.ibm.com/topics/log4j
    www.ibm.com/topics/log4j
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    What is the Log4j vulnerability?The Log4j vulnerability, also known as Log4Shell, is a critical vulnerability discovered in the Apache Log4j logging library in November 2021. Log4Shell essentially grants hackers total control of devices running unpatched versions of Log4j. Malicious actors can use the Log4j flaw to run almost any code they want on vulnerable systems.

    What is the Log4j Vulnerability? | IBM

    ibm.com
    Why is Log4j a zero-day (unpatched) vulnerability?Attacks started soon after, making the flaw a zero-day (unpatched) issue at the moment of exploitation. Apache has since released Log4j 2.15.0 which includes a fix. The vulnerability can lead to remote code execution on the underlying servers that run vulnerable applications and exploiting the issue requires no authentication.

    Apache Log4j vulnerability actively exploited, impacting millions of

    csoonline.com
    What happened to Log4j?In December 2021, a vulnerability in the open source Log4J logging service used by developers to monitor their Java applications first came to light, leaving enterprises scrambling to patch affected systems.

    Top three questions about the Log4j vulnerability

    computerweekly.com
    Is Apache Log4j vulnerable?Attackers are actively exploiting a critical vulnerability in Apache Log4j, a logging library that’s used in potentially millions of Java-based applications, including web-based ones. Organizations should immediately review if their apps, especially the publicly accessible ones, use the library and should implement mitigations as soon as possible.

    Apache Log4j vulnerability actively exploited, impacting millions of

    csoonline.com
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    Wikipedia
    https://en.wikipedia.org/wiki/Log4j

    Log4j - Wikipedia

    A zero-day vulnerability involving remote code execution in Log4j 2, given the descriptor "Log4Shell" (CVE-2021-44228), was found and reported to Apache by Alibaba on November 24, 2021, and published in a tweet on December 9, 2021. Affected services include Cloudflare, iCloud, Minecraft: Java … See more

    Overview

    Apache Log4j is a Java-based logging utility originally written by Ceki Gülcü. It is part of the Apache Logging Services, a project of the See more

    Features

    Log4j log levels
    The following table defines the built-in log levels and messages in Log4j, in decreasing order of severity. The left column lists the log … See more

    Ports

    • log4c – A port for C. Log4C is a C-based logging library, released on SourceForge under the LGPL license. For various Unix operating systems the See more

    External links

    • Official website See more

    Overview image
    Apache Log4j 2

    Apache Log4j 2 is the successor of Log4j 1 which was released as GA version in July 2014. The framework was rewritten from scratch and has been inspired by existing logging solutions, including Log4j 1 and java.util.logging. The main differences from Log4j 1 are: See more

    See also

    • Computer programming portal
    • Free and open-source software portal See more

    Further reading

    • Gülcü, Ceki (February 2010), The Complete Log4j Manual (2nd ed.), QOS.ch, p. 204, ISBN 978-2-9700369-0-6
    • Gupta, Samudra (June 22, 2005), Pro Apache Log4j (2nd … See more

     
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  5. Built In
    https://builtin.com/articles/log4j-vulerability-explained

    Log4J Vulnerability Explained: What It Is and How to Fix It

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    4 ways to properly mitigate the Log4j vulnerabilities (and …
    csoonline.com
    Check for Log4j vulnerabilities with this simple-to-use script
    techrepublic.com
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  6. CISA
    https://www.cisa.gov/news-events/news/apache-log4j...

    Apache Log4j Vulnerability Guidance | CISA

  8. IBM
    https://www.ibm.com/topics/log4j

    What is the Log4j Vulnerability? | IBM

  9. CISA
    https://www.cisa.gov/news-events/cybersecurity...

    Mitigating Log4Shell and Other Log4j-Related Vulnerabilities

  10. CSO Online
    https://www.csoonline.com/article/571797

    The Apache Log4j vulnerabilities: A timeline | CSO …

    WEBJan 7, 2022 · The Apache Log4j vulnerability has made global headlines since it was discovered in early December. The flaw has impacted vast numbers of organizations around the world as security teams have...

  11. Gartner
    https://www.gartner.com/en/articles/what-security...

    Log4j Vulnerability: What Security Leaders Need To Know and …

  12. WIRED
    https://www.wired.com/story/log4j-log4she…

    A Year Later, That Brutal Log4j Vulnerability Is Still …

    WEBSecurity. Dec 10, 2022 7:00 AM. A Year Later, That Brutal Log4j Vulnerability Is Still Lurking. Despite mitigation, one of the worst bugs in internet history is still prevalent—and being...

  13. WIRED
    https://www.wired.com/story/log4j-log4shell

    The Log4J Vulnerability Will Haunt the Internet for Years

  14. Ars Technica
    https://arstechnica.com/information-technology/...

    The Internet’s biggest players are all affected by critical Log4Shell …

  15. CSO Online
    https://www.csoonline.com/article/571765

    Apache Log4j vulnerability actively exploited, impacting millions of ...

  16. UpGuard
    https://www.upguard.com/blog/apache-log4j-vulnerability

    Log4Shell: The Log4j Vulnerability Emergency Clearly Explained

  17. Datadog Security Labs
    https://securitylabs.datadoghq.com/articles/log4j...

    The Log4j Log4Shell vulnerability: Overview, detection, and …

  18. WIRED
    https://www.wired.com/story/log4j-log4shell...

    The Next Wave of Log4J Attacks Will Be Brutal | WIRED

  19. Computer Weekly
    https://www.computerweekly.com/news/252512071/Top...

    Top three questions about the Log4j vulnerability

  20. IBM
    https://www.ibm.com/blog/how-to-detect-patch-log4j-vulnerability

    How to detect and patch a Log4J vulnerability - IBM Blog

  21. F5
    https://www.f5.com/labs/articles/threat...

    Explaining the Widespread log4j Vulnerability | F5 Labs

  22. CBS News
    https://www.cbsnews.com/news/log4j-vulnerability-breach-patch

    Log4j vulnerability: What to know - CBS News

  23. Veracode
    https://www.veracode.com/blog/research/state-log4j...

    State of Log4j Vulnerabilities: How Much Did Log4Shell Change?

  24. securestack.com
    https://securestack.com/log4shell-incident-breakdown

    The Log4J Vulnerability & Log4Shell Incident Explained

  25. InfoSec Write-ups
    https://infosecwriteups.com/what-are-the-log4j...

    What are the log4j vulnerabilities, and how did it function?

  26. apache.org
    https://cwiki.apache.org/confluence/display/COMDEV/...

    Log4j vulnerability background - Community Development

  27. NetSPI
    https://www.netspi.com/.../log4j-vulnerability-impact

    Is Your Organization Affected by Log4j? - netspi.com