What’s Vulnerable › Vulnerabilities

CVE-2020-7693: Denial of Service (DoS)

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-07-09 · updated 2026-06-17
• Weakness: CWE-755

Description

Incorrect handling of Upgrade header with the value websocket leads in crashing of containers hosting sockjs apps. This affects the package sockjs before 0.3.20.

Affected products

• sockjs: before 0.3.20 — fixed in 0.3.20
• Npm Sockjs: before 0.3.20 — fixed in 0.3.20

How to fix

Upgrade to a fixed version: sockjs 0.3.20; Npm Sockjs 0.3.20. Check the vendor advisory for mitigations.

References

• https://github.com/andsnw/sockjs-dos-py
• https://github.com/sockjs/sockjs-node/commit/dd7e642cd69ee74385825816d30642c43e051d16
• https://github.com/sockjs/sockjs-node/issues/252
• https://github.com/sockjs/sockjs-node/pull/265
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-575448
• https://snyk.io/vuln/SNYK-JS-SOCKJS-575261
• https://github.com/andsnw/sockjs-dos-py
• https://github.com/sockjs/sockjs-node/commit/dd7e642cd69ee74385825816d30642c43e051d16
• https://github.com/sockjs/sockjs-node/issues/252
• https://github.com/sockjs/sockjs-node/pull/265
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-575448
• https://snyk.io/vuln/SNYK-JS-SOCKJS-575261

Get alerted when CVE-2020-7693 or the next vulnerability affects your stack