Improper Validation of Certificate with Host Mismatch in Java-WebSocket

published 2020-05-07 6 y ago modified 2026-09-10 1 mo ago also GHSA-gw55-jm4h-x339 , EUVD-2020-0424

cvss: 9.0; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits: 0; none known

In Java-WebSocket less than or equal to 1.4.1, there is an Improper Validation of Certificate with Host Mismatch where WebSocketClient does not perform SSL hostname validation. This has been patched in 1.5.0.

Patch / fix

fixed in 1

maven org.java-websocket:Java-WebSocket 1.5.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-11050 updated 2026-11-04 cvss 8.1

java-websocket: WebSocketClient does not perform SSL hostname validation

Red Hat Fuse 7 java-websocket java-websocket Red Hat Integration Camel K 1 java-websocket java-websocket
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.79% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	9.0	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
NVD	3.1	8.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P
GitHub	3.1	9.0	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
maven	org.java-websocket:Java-WebSocket	<1.5.0	1.5.0

Affected products

TooTallNate Java-WebSocket

Classification

Weakness

CWE-297 Improper Validation of Certificate with Host Mismatch
CWE-295 Improper Certificate Validation

References

github.com /TooTallNate/Java-WebSocket/security/advisories/GHSA-gw55-jm4h-x339
web, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2020-11050
advisory
github.com /TooTallNate/Java-WebSocket
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary