What’s Vulnerable › Vulnerabilities

CVE-2020-13661

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-11-05 · updated 2026-06-17

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.

Affected products

• Telerik Fiddler: through 5.0.20202.18177

References

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

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