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CVE-2020-15134

21
FAUCET Score

CVE-2020-15134 affects Faye versions prior to 1.4.0, stemming from a lack of certification validation in TLS handshakes within its Ruby client, specifically when using wss: URLs. This vulnerability, rated 8.7 HIGH (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N), allows for man-in-the-middle attacks due to the client not verifying the server's TLS certificate, potentially leading to high confidentiality and integrity impacts. While the initial HTTP request might be secure, subsequent WebSocket connections are vulnerable. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.4.0CPE matchmatch criteria
cpe:2.3:a:faye_project:faye:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.0HIGH

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
1.6
Impact Score
5.8
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.86%
Probability of exploitation in next 30 days
EPSS Percentile
54.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0086 is in the 22nd percentile among its peer group of 8,914 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, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (1)

rubygemspatch availablevia ghsa
Product: fayeFixed in: 1.4.0

Vendor Advisories (1)

rubygemsGHSA-3q49-h8f9-9fr9high

Missing TLS certificate verification

Jul 31, 2020

References

blog.jcoglan.com / 2020/07/31/missing-tls-verification-in-faye
ExploitThird Party Advisory
github.com / faye/faye/security/advisories/GHSA-3q49-h8f9-9fr9
ExploitThird Party Advisory