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Fencer Vulns
medium 5.3

CVE-2019-20372 json

NGINX before 1.17.7, with certain error_page configurations, allows HTTP request smuggling, as demonstrated by the ability of an attacker t…

published 2020-01-09 6 y ago modified 2026-06-17 4 mo ago also EUVD-2019-10924

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
15.0%
EPSS 15.0% chance of exploitation in 30 days, percentile 96%
public exploits
0
none known

Summary

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.

Patch / fix

  • f5 nginx 1.17.7
  • apple xcode 13.0
  • nginx Debian 14, Debian 13, Debian 12 1.16.1-3

debian advisories DEBIAN-CVE-2019-20372

  • nginx Ubuntu 16.04 LTS 1.10.3-0ubuntu0.16.04.5
  • nginx Ubuntu 18.04 LTS 1.14.0-0ubuntu1.7
  • nginx Ubuntu Pro 14.04 LTS 1.4.6-1ubuntu3.9+esm1

ubuntu advisories UBUNTU-CVE-2019-20372

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • nginx RHEL 8 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
  • nginx-mod-mail RHEL 8 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
  • nginx-filesystem RHEL 8 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
  • nginx-mod-stream RHEL 8 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
  • nginx-all-modules RHEL 8 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
  • nginx-mod-http-perl RHEL 8 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
  • nginx-mod-http-xslt-filter RHEL 8 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
  • nginx-mod-http-image-filter RHEL 8 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1

red hat advisories RHSA-2020:5495RHSA-2020:2817

  • nginx SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 1.16.1-3.12.7
  • nginx SLE Module for Server Applications 15 SP1 1.14.2-6.7.1

suse advisories SUSE-SU-2020:1171-1SUSE-SU-2020:0348-1

  • nginx openSUSE Tumbleweed 1.21.3-1.4
  • nginx openSUSE Leap 15.1 1.14.2-lp151.4.6.1

opensuse advisories openSUSE-SU-2024:11092-1openSUSE-SU-2020:0204-1

  • nginx Alpine 3.10 1.16.1-r2
  • nginx Alpine 3.24, Alpine 3.23, Alpine 3.22 +11 more 1.16.1-r6
  • nginx Alpine 3.8 1.14.2-r2
  • nginx Alpine 3.9 1.14.2-r5

alpine advisories ALPINE-CVE-2019-20372

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-20372 updated cvss 5.3

nginx: HTTP request smuggling in configurations with URL redirect used as error_page

  • Red Hat CloudForms Management Engine 5 nginx, nginx-mod-mail, nginx-filesystem, nginx-mod-stream, nginx-all-modules, nginx-mod-http-perl, +3 more Red Hat Enterprise Linux 8 nginx, nginx-mod-mail, nginx-filesystem, nginx-mod-stream, nginx-all-modules, nginx-mod-http-perl, +2 more Red Hat Software Collections rh-nginx110-nginx, rh-nginx114-nginx, rh-nginx110-nginx-mod-mail, rh-nginx114-nginx-mod-mail, rh-nginx110-nginx-mod-stream, rh-nginx114-nginx-mod-stream, +6 more
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Ansible Tower 3.6 for RHEL 7 ansible-tower-36/ansible-tower 3.6.7-1
    fixed: vendor fix RHSA-2021:0778
  • Red Hat Ansible Tower 3.7 for RHEL 7 ansible-tower-37/ansible-tower-rhel7 3.7.5-1
    fixed: vendor fix RHSA-2021:0779
  • Red Hat Enterprise Linux AppStream (v. 8) nginx 1.16.1-1.module+el8.3.0+8844+e5e7039f.1, nginx-mod-mail 1.16.1-1.module+el8.3.0+8844+e5e7039f.1, nginx-filesystem 1.16.1-1.module+el8.3.0+8844+e5e7039f.1, nginx-mod-stream 1.16.1-1.module+el8.3.0+8844+e5e7039f.1, nginx-all-modules 1.16.1-1.module+el8.3.0+8844+e5e7039f.1, nginx-mod-http-perl 1.16.1-1.module+el8.3.0+8844+e5e7039f.1, +2 more
    fixed: vendor fix RHSA-2020:5495
  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-nginx116-nginx 1.16.1-4.el7.1, rh-nginx116-nginx-mod-mail 1.16.1-4.el7.1, rh-nginx116-nginx-mod-stream 1.16.1-4.el7.1, rh-nginx116-nginx-mod-http-perl 1.16.1-4.el7.1, rh-nginx116-nginx-mod-http-xslt-filter 1.16.1-4.el7.1, rh-nginx116-nginx-mod-http-image-filter 1.16.1-4.el7.1 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) rh-nginx116-nginx 1.16.1-4.el7.1, rh-nginx116-nginx-mod-mail 1.16.1-4.el7.1, rh-nginx116-nginx-mod-stream 1.16.1-4.el7.1, rh-nginx116-nginx-mod-http-perl 1.16.1-4.el7.1, rh-nginx116-nginx-mod-http-xslt-filter 1.16.1-4.el7.1, rh-nginx116-nginx-mod-http-image-filter 1.16.1-4.el7.1 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) rh-nginx116-nginx 1.16.1-4.el7.1, rh-nginx116-nginx-mod-mail 1.16.1-4.el7.1, rh-nginx116-nginx-mod-stream 1.16.1-4.el7.1, rh-nginx116-nginx-mod-http-perl 1.16.1-4.el7.1, rh-nginx116-nginx-mod-http-xslt-filter 1.16.1-4.el7.1, rh-nginx116-nginx-mod-http-image-filter 1.16.1-4.el7.1 Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-nginx116-nginx 1.16.1-4.el7.1, rh-nginx116-nginx-mod-mail 1.16.1-4.el7.1, rh-nginx116-nginx-mod-stream 1.16.1-4.el7.1, rh-nginx116-nginx-mod-http-perl 1.16.1-4.el7.1, rh-nginx116-nginx-mod-http-xslt-filter 1.16.1-4.el7.1, rh-nginx116-nginx-mod-http-image-filter 1.16.1-4.el7.1
    fixed: vendor fix RHSA-2020:2817

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

14.96% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bertjwregeer.keybase.pub https://bertjwregeer.keybase.pub/2019-12-10%20-%20error_page%20request%20smuggling.pdf referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.