CVE-2020-13661

high

Description

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.

References

https://www.telerik.com/support/whats-new/release-history

https://www.telerik.com/support/whats-new/fiddler/release-history/fiddler-v5.0.20204

https://www.nagenrauft-consulting.com/blog/

Details

Source: Mitre, NVD

Published: 2020-11-05

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 6.8

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P

Severity: Medium

CVSS v3

Base Score: 8.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Severity: High

EPSS

EPSS: 0.00573