aaugustin websockets version 4 contains a CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in Servers and clients, unless configured with compression=None that can result in Denial of Service by memory exhaustion. This attack appear to be exploitable via Sending a specially crafted frame on an established connection. This vulnerability appears to have been fixed in 5.

pooledwebsocket is vulnerable to a directory traversal issue, giving an attacker access to the filesystem by placing "../" in the url.

The HTTP and WebSocket engine components in the server in Kaazing Gateway 4.0.2, 4.0.3, and 4.0.4 and Gateway - JMS Edition 4.0.2, 4.0.3, and 4.0.4 allow remote attackers to obtain sensitive information via vectors related to HTTP request handling.

The HTTP and WebSocket engine components in the server in Kaazing Gateway before 4.5.3 hotfix-1, Gateway - JMS Edition before 4.0.5 hotfix-15, 4.0.6 before hotfix-4, 4.0.7, 4.0.9 before hotfix-19, 4.4.x before 4.4.2 hotfix-1, 4.5.x before 4.5.3 hotfix-1, and Gateway Community and Enterprise Editions before 5.6.0 allow remote attackers to bypass intended access restrictions and obtain sensitive information via vectors related to HTTP request handling.

The Java WebSocket client nv-websocket-client does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL/TLS servers via an arbitrary valid certificate.

An elevation of privilege vulnerability exists when the ASP.NET Core fails to properly sanitize web requests.

A spoofing vulnerability exists when the ASP.NET Core fails to properly sanitize web requests.

A denial of service vulnerability exists when the ASP.NET Core fails to properly validate web requests. NOTE: Microsoft has not commented on third-party claims that the issue is that the TextEncoder.EncodeCore function in the System.Text.Encodings.Web package in ASP.NET Core Mvc before 1.0.4 and 1.1.x before 1.1.3 allows remote attackers to cause a denial of service by leveraging failure to properly calculate the length of 4-byte characters in the Unicode Non-Character range.