CVE-2020-25613

An issue was discovered in Ruby through 2.5.8, 2.6.x through 2.6.6, and 2.7.x through 2.7.1. WEBrick, a simple HTTP server bundled with Ruby, had not checked the transfer-encoding header value rigorously. An attacker may potentially exploit this issue to bypass a reverse proxy (which also has a poor header check), which may lead to an HTTP Request Smuggling attack.

• CWE-444

• https://github.com/ruby/webrick/commit/8946bb38b4d87549f0d99ed73c62c41933f97cc7Patch, Third Party Advisory
• https://hackerone.com/reports/965267Permissions Required, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PFP3E7KXXT3H3KA6CBZPUOGA5VPFARRJ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTZURYROG3FFED3TYCQOBV66BS4K6WOV/
• https://security.gentoo.org/glsa/202401-27
• https://security.netapp.com/advisory/ntap-20210115-0008/Third Party Advisory
• https://www.ruby-lang.org/en/news/2020/09/29/http-request-smuggling-cve-2020-25613/Vendor Advisory
• https://github.com/ruby/webrick/commit/8946bb38b4d87549f0d99ed73c62c41933f97cc7Patch, Third Party Advisory
• https://hackerone.com/reports/965267Permissions Required, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PFP3E7KXXT3H3KA6CBZPUOGA5VPFARRJ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTZURYROG3FFED3TYCQOBV66BS4K6WOV/
• https://security.gentoo.org/glsa/202401-27
• https://security.netapp.com/advisory/ntap-20210115-0008/Third Party Advisory
• https://www.ruby-lang.org/en/news/2020/09/29/http-request-smuggling-cve-2020-25613/Vendor Advisory

Published

Oct 6, 2020

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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