CVE-2019-20372

NGINX before 1.17.7, with certain error_page configurations, allows HTTP request smuggling, as demonstrated by the ability of an attacker to read unauthorized web pages in environments where NGINX is being fronted by a load balancer.

• CWE-444

• http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00013.htmlMailing List, Third Party Advisory
• http://nginx.org/en/CHANGESMitigation, Release Notes, Vendor Advisory
• http://seclists.org/fulldisclosure/2021/Sep/36Mailing List, Third Party Advisory
• https://bertjwregeer.keybase.pub/2019-12-10%20-%20error_page%20request%20smuggling.pdfExploit, Mitigation, Third Party Advisory
• https://duo.com/docs/dng-notes#version-1.5.4-january-2020Release Notes, Third Party Advisory
• https://github.com/kubernetes/ingress-nginx/pull/4859Patch, Third Party Advisory
• https://github.com/nginx/nginx/commit/c1be55f97211d38b69ac0c2027e6812ab8b1b94ePatch, Vendor Advisory
• https://security.netapp.com/advisory/ntap-20200127-0003/Third Party Advisory
• https://support.apple.com/kb/HT212818Third Party Advisory
• https://usn.ubuntu.com/4235-1/Third Party Advisory
• https://usn.ubuntu.com/4235-2/Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00013.htmlMailing List, Third Party Advisory
• http://nginx.org/en/CHANGESMitigation, Release Notes, Vendor Advisory
• http://seclists.org/fulldisclosure/2021/Sep/36Mailing List, Third Party Advisory
• https://bertjwregeer.keybase.pub/2019-12-10%20-%20error_page%20request%20smuggling.pdfExploit, Mitigation, Third Party Advisory
• https://duo.com/docs/dng-notes#version-1.5.4-january-2020Release Notes, Third Party Advisory
• https://github.com/kubernetes/ingress-nginx/pull/4859Patch, Third Party Advisory
• https://github.com/nginx/nginx/commit/c1be55f97211d38b69ac0c2027e6812ab8b1b94ePatch, Vendor Advisory
• https://security.netapp.com/advisory/ntap-20200127-0003/Third Party Advisory
• https://support.apple.com/kb/HT212818Third Party Advisory
• https://usn.ubuntu.com/4235-1/Third Party Advisory
• https://usn.ubuntu.com/4235-2/Third Party Advisory

Published

Jan 9, 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.
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