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Vulnerability record · CVE-2019-20372 · published 9 January 2020

CVE-2019-20372: F5 nginx http request smuggling vulnerability

F5 · Nginx

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.

5.3 CVSS 3.1 Medium EPSS 15% · top 3.4% CWE-444 · HTTP request smuggling
5.3CVSS 3.1 base score, v2 4.3
15%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
22References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00013.html Mailing ListThird Party Advisory
http://nginx.org/en/CHANGES MitigationRelease NotesVendor Advisory
http://seclists.org/fulldisclosure/2021/Sep/36 Mailing ListThird Party Advisory
https://bertjwregeer.keybase.pub/2019-12-10%20-%20error_page%20request%20smuggling.pdf ExploitMitigationThird Party Advisory
https://duo.com/docs/dng-notes#version-1.5.4-january-2020 Release NotesThird Party Advisory
https://github.com/kubernetes/ingress-nginx/pull/4859 PatchThird Party Advisory
https://github.com/nginx/nginx/commit/c1be55f97211d38b69ac0c2027e6812ab8b1b94e PatchVendor Advisory
https://security.netapp.com/advisory/ntap-20200127-0003/ Third Party Advisory
https://support.apple.com/kb/HT212818 Third 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.html Mailing ListThird Party Advisory
http://nginx.org/en/CHANGES MitigationRelease NotesVendor Advisory
http://seclists.org/fulldisclosure/2021/Sep/36 Mailing ListThird Party Advisory
https://bertjwregeer.keybase.pub/2019-12-10%20-%20error_page%20request%20smuggling.pdf ExploitMitigationThird Party Advisory
https://duo.com/docs/dng-notes#version-1.5.4-january-2020 Release NotesThird Party Advisory
https://github.com/kubernetes/ingress-nginx/pull/4859 PatchThird Party Advisory
https://github.com/nginx/nginx/commit/c1be55f97211d38b69ac0c2027e6812ab8b1b94e PatchVendor Advisory
https://security.netapp.com/advisory/ntap-20200127-0003/ Third Party Advisory
https://support.apple.com/kb/HT212818 Third Party Advisory
https://usn.ubuntu.com/4235-1/ Third Party Advisory
https://usn.ubuntu.com/4235-2/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-20372), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.