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Home > Cybersecurity > The Log4j flaw is patched but it is still vulnerable

The Log4j flaw is patched but it is still vulnerable

The CVE-2021-44228 flaw is fixed in recent days with an incomplete patch which still leaves some doors open.


Rusen Gobel Rusen Gobel
December 16, 2021
2 min read
The Log4j flaw is patched, but it is still vulnerable

The Log4j vulnerability has been in the wild for a few days. Because of the origin of the flaw, which is the widely used Java logging library Apache, the risk is quite extensive. In addition to that, the Log4j flaw opens the door for remote code execution, making it a massive threat. The CVSS score of the flaw is 10.0, which is the maximum on the scale.

The patch is incomplete

We have shared the details of the guidance which is published by the Cybersecurity and Infrastructure Security Agency (CISA) and its partners about the vulnerability for identifying, mitigating, and patching. But the new reports show that the patch was not complete, and the Apache systems are still vulnerable.

The patch, which has was published for CVE-2021-44228, Apache Log4j 2.15.0, addresses most of the problems but not all of them. After the new patch, some vulnerabilities still exist, tracked as CVE-2021-45046. The CVSS score of the new vulnerability is 3.7.

CVE-2021-45046 is a flaw in specific non-default configurations of Apache Log4Shell: from 2.0-beta9 through 2.12.1 and 2.13.0 through 2.15.0. It can be abused to craft malicious data using a JNDI Lookup pattern which results in a denial-of-service attack. As this information emerges, Apache launched another update which consists of only disabling JNDI by default and completely removing message lookup support. Those capabilities were the core of the flaw, as we mentioned before.

The services that use Java 8 or above should update the Log4j to 2.16.0. And the Java 7 users should stick to 2.12.2, which is currently under development, and expected to be available soon. Users who can’t apply patches immediately should remove the JndiLookup class from the classpath:

zip-p d log4j-core-*.jar org/apache/logging/log4j/core/lookup/jndiLookup.class

Microsoft noted that the CVE-2021-45046 flaw is currently being inspected or abused by hackers originating from China, Iran, North Korea, and Turkey.

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See more Cybersecurity News

A comprehensive guide to understanding Cybersecurity: What is Cybersecurity?


Tags: Apache HTTP ServerJava
Rusen Gobel

Rusen Gobel

Rusen Gobel is the managing editor of Cloud7. With more than 10 years of experience, Rusen worked as a hardware and software news editor for technology sites such as ShiftDelete, Teknokulis, Hardware Plus, BT Haber. In addition, Rusen publishes consumer product reviews on his YouTube channel. While consumer electronics has been his main focus for years, now Rusen is more interested in WordPress and software development. He had contributed different web application projects in his professional career. Rusen had graduated from Istanbul University, department of Computer Engineering. Rusen has a very high passion for learning and writing for every kind of technology. That's why he has been working as a tech editor for more than ten years on several different technology magazines and online news portals.

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