CVE-2020-13661

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.

• https://www.nagenrauft-consulting.com/blog/Not Applicable
• https://www.telerik.com/support/whats-new/fiddler/release-history/fiddler-v5.0.20204Release Notes, Vendor Advisory
• https://www.telerik.com/support/whats-new/release-historyRelease Notes, Vendor Advisory
• https://www.nagenrauft-consulting.com/blog/Not Applicable
• https://www.telerik.com/support/whats-new/fiddler/release-history/fiddler-v5.0.20204Release Notes, Vendor Advisory
• https://www.telerik.com/support/whats-new/release-historyRelease Notes, Vendor Advisory

Published

Nov 5, 2020

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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