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CVE-2020-15133

28
FAUCET Score

CVE-2020-15133 describes a critical vulnerability in faye-websocket versions prior to 0.11.0, specifically a lack of TLS certificate validation in the Faye::WebSocket::Client class. This flaw allows for man-in-the-middle attacks on wss: connections, as the client does not verify the server's identity. With a CVSS score of 8.7 (HIGH), this vulnerability has a network attack vector and high impact on confidentiality and integrity, despite a high attack complexity. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.11.0CPE matchmatch criteria
cpe:2.3:a:faye-websocket_project:faye-websocket:*:*:*:*:*:*:*:*

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
0.91%
Probability of exploitation in next 30 days
EPSS Percentile
56.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0091 is in the 23rd percentile among its peer group of 8,915 CVEs.

Social Chatter

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: faye-websocketFixed in: 0.11.0

Vendor Advisories (1)

rubygemsGHSA-2v5c-755p-p4gvhigh

Missing TLS certificate verification in faye-websocket

Jul 31, 2020

References

blog.jcoglan.com / 2020/07/31/missing-tls-verification-in-faye
ExploitThird Party Advisory
github.com / faye/faye-websocket-ruby/security/advisories/GHSA-2v5c-755p-p4gv
ExploitThird Party Advisory