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Telerik Fiddler through 5.0.20202.18177 allows attackers to execute arbitrary programs via a hostname with a trailing space character, followed by --utility-and-browser --utility-cmd-prefix= and the pathname of a locally installed program. The victim must interactively choose the Open On Browser option. Fixed in version 5.0.20204.
Use Telerik vendor hub and Fiddler product page to widen CVE-2020-13661 into its surrounding weakness, vendor, and product context.