Read the docs
TI-2020-10721 Aliases CVE-2020-13661GHSA-gf4w-r33x-hg8c

Telerik Fiddler through 5.0.20202.18177 allows attackers to execute arbitrary programs…

Priority MEDIUM 40Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

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.

Why it matters now

EPSS 0.01158 67th percentileScored 2026-11-08
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:telerik:fiddler:*:*:*:*:*:*:*:*up to 5.0.20202.18177VulnerableTelerik
  • cpe:2.3:a:telerik:fiddler:*:*:*:*:*:*:*:* Versions up to 5.0.20202.18177 Vulnerable ·Telerik

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-13661
  2. 2026-10-03 Alias added: GHSA-gf4w-r33x-hg8c

References

Advisory 2

Other 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences