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Read More. Here's what you should know:. What is Log4j and why does it matter? Log4j is one of the most popular logging libraries used online, according to cybersecurity experts. Log4j gives software developers a way to build a record of activity to be used for a variety of purposes, such as troubleshooting, auditing and data tracking. Because it is both open-source and free, the library essentially touches every part of the internet.

Even if you're a developer who doesn't use Log4j directly, you might still be running the vulnerable code because one of the open source libraries you use depends on Log4j," Chris Eng, chief research officer at cybersecurity firm Veracode, told CNN Business.

It could present in popular apps and websites, and hundreds of millions of devices around the world that access these services could be exposed to the vulnerability. Are hackers exploiting it? Attackers appear to have had more than a week's head start on exploiting the software flaw before it was publicly disclosed, according to cybersecurity firm Cloudflare. Now, with such a high number of hacking attempts happening each day, some worry the worst is to yet come.

Late Tuesday, Microsoft said in an update to a blog post that state-backed hackers from China, Iran, North Korea and Turkey have tried to exploit the Log4j flaw.

Why is this security flaw so bad? Experts are especially concerned about the vulnerability because hackers can gain easy access to a company's computer server, giving them entry into other parts of a network.

It's also very hard to find the vulnerability or see if a system has already been compromised, according to Kennedy.

In addition, a second vulnerability in Log4j's system was found late Tuesday. Apache Software Foundation, a nonprofit that developed Log4j and other open source software, has released a security fix for organizations to apply. How are companies are trying to address the issue? Last week, Minecraft published a blog post announcing a vulnerability was discovered in a version of its game -- and quickly issued a fix.

Other companies have taken similar steps. US warns hundreds of millions of devices at risk from newly revealed software vulnerability. IBM, Oracle, AWS and Cloudflare have all issued advisories to customers, with some pushing security updates or outlining their plans for possible patches.

It's going to require a lot of time and effort," said Kennedy. For transparency and to help cut down on misinformation, CISA said it would set up a public website with updates on what software products were affected by the vulnerability and how hackers exploited them.

For example, if you have a video card that has MB of on-board memory, that memory must be mapped within the first 4 GB of address space. If 4 GB of system memory is already installed, part of that address space must be reserved by the graphics memory mapping. Graphics memory mapping overwrites a part of the system memory. These conditions reduce the total amount of system memory that is available to the operating system.

For more information about how to determine how memory is used on your computer, see the " Physical Memory Allocation in Windows 7 " topic in the "More Information" section. There are several additional situations that could cause the usable RAM to be less than expected.

These issues and possible solutions are listed here:. This problem may occur because the Maximum memory option is selected incorrectly. To fix this, follow these steps:. Click Start , type msconfig in the Search programs and files box, and then click msconfig in the Programs list. In the System Configuration window, click Advanced options on the Boot tab. Click to clear the Maximum memory check box, and then click OK. The problem may occur because the system BIOS is outdated.

If you have an older computer, the system may be unable to access all the installed RAM. In this case, you have to update the system BIOS to the latest version.

Or, contact your computer manufacturer for help. Enable the memory remapping feature Check the BIOS settings to see whether the memory remapping feature is enabled.

Memory remapping gives Windows access to more memory. You can enable the memory remapping feature in the BIOS by booting to the system setup. See the User's Guide for your computer for instructions on how to boot to system setup on your computer. The name for the memory remapping feature may be different for different hardware vendors. This can be listed as memory remapping, memory extension, or something similar. Be aware that your computer may not support the memory remapping feature.

This is the memory that the system is sharing with the video card that is used for texture mapping and rendering. This memory would not be used by the system, because it is locked by the video card. You can test each setting to see which offers the best results. Check whether you have bad memory modules To check whether you are experiencing this issue, turn off the computer, unplug the computer, and then swap the order of the memory. Make sure that the memory arrangement is correct Refer to the User's Guide of the computer to determine in what order the memory modules should be inserted into the memory slots.

The system may require you to use specific slots when you are not using all the available slots. For example, the computer has four slots available.

But you may have to use slot 1 and slot 3 if you want to use only two memory modules. Check whether memory standoff cards are used If you use a memory standoff card to hold multiple memory modules on the computer, the system may require specific configurations for this scenario.

Therefore, the usable memory may be less than expected. The following sections offer additional information about memory allocation as reported in the Resource Monitor, describe the terminology used, and offer additional information on Memory reporting and memory limitations in Windows 7.

The following table shows how the Resource Monitor categorizes the memory currently installed on a Windows 7-based computer. Memory that does not contain any valuable data and that will be used first when processes, drivers, or the operating system need more memory. Note To view how the installed memory is allocated in Windows 7, follow these steps:.

Click Start , type resource monitor in the Search programs and files box, and then click Resource Monitor in the Programs list. Click the Memory tab, and then view the Physical Memory section at the bottom of the page. The following table defines the Resource Monitors current reported status of the installed memory on a Windows 7-based computer.

Amount of memory including standby and free memory that is immediately available for use by processes, drivers, and the operating system. Amount of memory including standby and modified memory that contains cached data and code for rapid access by processes, drivers, and the operating system. Amount of physical memory that is available to the operating system, device drivers, and processes.

Windows 7 reports how much physical memory is currently installed on your computer. Windows NT-based operating systems before Windows Vista Service P1 report how much memory is available to the operating system. The available memory reported in these earlier versions of Windows does not include hardware reserved memory.