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CVE-2020-13661

22
FAUCET Score

CVE-2020-13661 is a high-severity vulnerability affecting Telerik Fiddler versions through 5.0.20202.18177, allowing remote attackers to execute arbitrary programs. This is achieved by manipulating a hostname with specific trailing characters, which, when combined with a user interactively selecting the "Open On Browser" option, can launch a local program. The vulnerability carries a CVSS score of 8.8, indicating a high potential for impact (confidentiality, integrity, and availability) with low attack complexity, though user interaction is required. There is currently no evidence of active exploitation, nor are there publicly available exploit modules or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 5.0.20202.18177CPE matchmatch criteria
cpe:2.3:a:telerik:fiddler:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.14%
Probability of exploitation in next 30 days
EPSS Percentile
63.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0114 is in the 62nd percentile among its peer group of 14,855 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

nagenrauft-consulting.com / blog
Not Applicable
telerik.com / support/whats-new/fiddler/release-history/fiddler-v5.0.20204
Release NotesVendor Advisory
telerik.com / support/whats-new/release-history
Release NotesVendor Advisory