Security Experts:

Adobe Patches Critical RoboHelp Server Security Flaw

Software maker Adobe on Tuesday released patches to cover at least four documented security defects that expose users to malicious hacker attacks.

The most serious of the flaw was addressed in RoboHelp Server and is rated “critical” because it exposes corporate environments to arbitrary code execution attacks.

Adobe warned that the vulnerability -- CVE-2021-39858 -- affects RoboHelp Server RHS2020.0.1 and earlier versions on the Microsoft Windows platform.

The company said it was unaware of any exploits in the wild targeting this flaw.

Separately, Adobe released security updates for its widely deployed Creative Cloud Desktop Application, confirming a denial of service flaw (CVE-2021-43017) exists in Version 5.5 and earlier versions for Apple’s macOS platform.

The company also provided security patches for a pair of vulnerabilities in the Adobe InCopy product. 

These two vulnerabilities -- CVE-2021-43015 and CVE-2021-43016 -- can be exploited to launch arbitrary code execution and application denial-of-service attacks, Adobe said in a bulletin posted Tuesday.

The Adobe InCopy flaws affect versions 16.4 and earlier on both Windows and macOS platforms.

Related: Adobe: Windows Users Hit by PDF Reader Zero-Day

Related: Adobe Patches Reader Vulnerability Exploited in the Wild

Related: Adobe Plugs Critical Photoshop Security Flaws

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Ryan Naraine is Editor-at-Large at SecurityWeek and host of the popular Security Conversations podcast series. Ryan is a veteran cybersecurity strategist who has built security engagement programs at major global brands, including Intel Corp., Bishop Fox and GReAT. He is a co-founder of Threatpost and the global SAS conference series. Ryan's past career as a security journalist included bylines at major technology publications including Ziff Davis eWEEK, CBS Interactive's ZDNet, PCMag and PC World. Ryan is a director of the Security Tinkerers non-profit, an advisor to early-stage entrepreneurs, and a regular speaker at security conferences around the world. Follow Ryan on Twitter @ryanaraine.