{"id":"CVE-2020-13661","aliases":["EUVD-2020-5902","GHSA-gf4w-r33x-hg8c"],"status":"published","title":"Telerik Fiddler through 5.0.20202.18177 allows attackers to execute arbitrary programs via a...","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.","severity":{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.01158,"percentile":0.67496,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2020-11-05T18:18:58Z","modified":"2026-06-17T02:53:31Z","products":[{"vendor":"telerik","product":"fiddler"}],"references":[{"url":"https://www.telerik.com/support/whats-new/release-history","tags":["x_refsource_MISC","x_transferred","Release Notes","Vendor Advisory"]},{"url":"https://www.nagenrauft-consulting.com/blog/","tags":["x_refsource_MISC","x_transferred","Not Applicable"]},{"url":"https://www.telerik.com/support/whats-new/fiddler/release-history/fiddler-v5.0.20204","tags":["x_refsource_MISC","x_transferred","Release Notes","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-13661"},{"url":"https://www.nagenrauft-consulting.com/blog"},{"url":"https://github.com/advisories/GHSA-gf4w-r33x-hg8c"}],"sources":{"cve":[{"id":"CVE-2020-13661","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.","status":"published","published":"2020-11-05T18:18:58Z","modified":"2024-08-04T12:25:16.434Z","updated_at":"2026-11-02T14:35:54.170199Z"}],"euvd":[{"id":"EUVD-2020-5902","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.","status":"published","published":"2020-11-05T18:18:58Z","modified":"2024-08-04T12:25:16Z","updated_at":"2026-11-03T03:07:36.6695Z"}],"ghsa":[{"id":"GHSA-gf4w-r33x-hg8c","title":"Telerik Fiddler through 5.0.20202.18177 allows attackers to execute arbitrary programs via a...","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.","status":"published","published":"2022-05-24T17:33:11Z","modified":"2024-04-04T03:03:19Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T14:56:13.24073Z"}],"nvd":[{"id":"CVE-2020-13661","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.","status":"published","published":"2020-11-05T19:15:12.977Z","modified":"2026-06-17T02:53:31.783Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:21.80969Z"}]}}