Hackers Take Advantage of Adobe Zero-Day Vulnerability Impacting Acrobat Reader

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A patch for Adobe Acrobat, the world’s most popular PDF reader, addresses a vulnerability that has been actively exploited and affects both Windows and macOS systems, allowing for arbitrary code execution. 
Adobe is advising customers about a crucial zero-day vulnerability in its widely used Adobe Acrobat PDF reader software that is being actively exploited in the wild. As part of Adobe’s Tuesday roundup of 43 fixes for 12 of its products, including Adobe Creative Cloud Desktop Application, Illustrator, InDesign, and Magento, a patch is now available. 
According to Adobe, the CVE-2021-28550 zero-day vulnerability “has been exploited in the wild in selective attacks targeting Adobe Reader users on Windows. Adobe Reader users on Windows may be the only ones that are currently being targeted. The bug, however, affects eight different versions of the software, including those for Windows and Mac. The versions include:
1.Windows Acrobat DC & Reader DC (versions 2021.001.20150 and earlier) 
2.macOS Acrobat DC & Reader DC (versions 2021.001.20149 and earlier) 
3.Windows & macOS Acrobat 2020 & Acrobat Reader 2020 (2020.001.30020 and earlier versions)
4.Windows & macOS Acrobat 2017 & Acrobat Reader 2017 (2017.011.30194  and earlier versions)
Adobe did not have any technical details about the zero-day flaw. Those details are usually available after users have had a chance to apply the patch. Users can manually update their product installations by going to Help > Check for Updates, according to Adobe’s May security bulletin, which was released on Tuesday. 
Several other important bugs were included in Tuesday’s roundup of 43 fixes. Adobe Acrobat received a total of ten crucial and four significant vulnerability patches. A total of seven of the bugs were arbitrary code execution bugs. Three of the vulnerabilities patched on Tuesday (CVE-2021-21044, CVE-2021-21038, and CVE-2021-21086) expose systems to out-of-bounds write attacks. 
On Tuesday, Adobe Illustrator got the highest number of patches, with five critical code execution vulnerabilities patched. Three of the flaws (CVE-2021-21103, CVE-2021-21104, and CVE-2021-21105), according to Adobe’s definition, are memory corruption bugs that enable hackers to execute arbitrary code on targeted systems. The three memory corruption bugs were discovered by Kushal Arvind Shah, a bug-hunter with Fortinet’s FortiGuard Labs.

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