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CVE-2019-20372

NGINX before 1.17.7, with certain error_page configurations, allows HTTP request smuggling, as...

5.3 MediumPublic exploitFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
None
Availability
None

Exploit likelihood

15.0%Up 12.8 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 5.3

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.

Record
CVE-2019-20372
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS 2.0
4.3 MediumAV:N/AC:M/Au:N/C:P/I:N/A:N
Weakness
CWE-444
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2019-20372
Updated
2026-11-02
EUVDEUVD-2019-10924 No score

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.

Record
EUVD-2019-10924
Updated
2026-11-03
GitHub AdvisoriesGHSA-c9vh-3f9g-f2xf 5.3

NGINX before 1.17.7, with certain error_page configurations, allows HTTP request smuggling, as...

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.

Record
GHSA-c9vh-3f9g-f2xf
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness
CWE-444
Updated
2026-11-02
OSVALPINE-CVE-2019-20372 5.3

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.

Record
ALPINE-CVE-2019-20372
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated
2026-11-02
OSVBELL-CVE-2019-20372 5.3

CVE-2019-20372 does not affect BellSoft software

Record
BELL-CVE-2019-20372
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated
2026-11-02
Show 12 moreShow less
OSV 5.3

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.

Record
CVE-2019-20372
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated
2026-11-02
OSVDEBIAN-CVE-2019-20372 5.3

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.

Record
DEBIAN-CVE-2019-20372
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated
2026-11-02
OSVRHSA-2020:2817 5.3

Red Hat Security Advisory: rh-nginx116-nginx security update

Record
RHSA-2020:2817
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated
2026-11-02
OSVRHSA-2020:5495 5.3

Red Hat Security Advisory: nginx:1.16 security update

Record
RHSA-2020:5495
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2019-20372 5.3

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.

Record
UBUNTU-CVE-2019-20372
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated
2026-11-02
OSVMGASA-2020-0231 No score

Updated nginx packages fix security vulnerability

Nginx was updated due to the following vulnerabilities: ngx_http_special_response.c: With a certain error_page configuration, HTTP request smuggling is possible. Thus, an attacker may be able to read unauthorized web pages at times when NGINX is being fronted by a load balancer. (CVE-2019-20372).

Record
MGASA-2020-0231
Updated
2026-11-02
OSVopenSUSE-SU-2020:0204-1 No score

Security update for nginx

This update for nginx fixes the following issues:

  • CVE-2019-20372: Fixed an HTTP request smuggling with certain error_page configurations which could have allowed unauthorized web page reads (bsc#1160682).

This update was imported from the SUSE:SLE-15-SP1:Update update project.

Record
openSUSE-SU-2020:0204-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:11092-1 No score

nginx-1.21.3-1.4 on GA media

These are all security issues fixed in the nginx-1.21.3-1.4 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11092-1
Updated
2026-11-02
OSVSUSE-SU-2020:0348-1 No score

Security update for nginx

This update for nginx fixes the following issues:

  • CVE-2019-20372: Fixed an HTTP request smuggling with certain error_page configurations which could have allowed unauthorized web page reads (bsc#1160682).
Record
SUSE-SU-2020:0348-1
Updated
2026-11-02
OSVSUSE-SU-2020:1171-1 No score

Security update for nginx

This update for nginx fixes the following issues:

nginx was updated to 1.16.1 (jsc#ECO-1401)

  • Added TLS 1.3 support (jsc#SLE-9295, bsc#1150711)
  • Replaced obsolete GeoIP module with MaxMinDB-based GeoIP2 (jsc#SLE-11184, bsc#1156202)
  • Started nginx after network is online (bsc#1155690)
  • CVE-2019-20372: Fixed an HTTP request smuggling with certain error_page configurations which could have allowed unauthorized web page reads (bsc#1160682).
Record
SUSE-SU-2020:1171-1
Updated
2026-11-02
OSVUSN-4235-1 No score

nginx vulnerability

Bert JW Regeer and Francisco Oca Gonzalez discovered that nginx incorrectly handled certain error_page configurations. A remote attacker could possibly use this issue to perform HTTP request smuggling attacks and access resources contrary to expectations.

Record
USN-4235-1
Updated
2026-11-02
OSVUSN-4235-2 No score

nginx vulnerability

USN-4235-1 fixed a vulnerability in nginx. This update provides the corresponding update for Ubuntu 14.04 ESM.

Original advisory details:

Bert JW Regeer and Francisco Oca Gonzalez discovered that nginx incorrectly handled certain error_page configurations. A remote attacker could possibly use this issue to perform HTTP request smuggling attacks and access resources contrary to expectations.

Record
USN-4235-2
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
nginx
Alpine:v3.10
before 1.16.1-r2
1.16.1-r2
nginx
Alpine:v3.11
before 1.16.1-r6
1.16.1-r6
nginx
Alpine:v3.12
before 1.16.1-r6
1.16.1-r6
nginx
Alpine:v3.13
before 1.16.1-r6
1.16.1-r6
nginx
Alpine:v3.14
before 1.16.1-r6
1.16.1-r6
nginx
Alpine:v3.15
before 1.16.1-r6
1.16.1-r6
nginx
Alpine:v3.16
before 1.16.1-r6
1.16.1-r6
nginx
Alpine:v3.17
before 1.16.1-r6
1.16.1-r6
nginx
Alpine:v3.18
before 1.16.1-r6
1.16.1-r6
nginx
Alpine:v3.19
before 1.16.1-r6
1.16.1-r6
Show 43 moreShow less
Affected packages
PackageAffectedFixed
nginx
Alpine:v3.20
before 1.16.1-r6
1.16.1-r6
nginx
Alpine:v3.21
before 1.16.1-r6
1.16.1-r6
nginx
Alpine:v3.22
before 1.16.1-r6
1.16.1-r6
nginx
Alpine:v3.23
before 1.16.1-r6
1.16.1-r6
nginx
Alpine:v3.24
before 1.16.1-r6
1.16.1-r6
nginx
Alpine:v3.8
before 1.14.2-r2
1.14.2-r2
nginx
Alpine:v3.9
before 1.14.2-r5
1.14.2-r5
nginx
Debian:12
before 1.16.1-3
1.16.1-3
nginx
Debian:13
before 1.16.1-3
1.16.1-3
nginx
Debian:14
before 1.16.1-3
1.16.1-3
nginx
Mageia:7
before 1.16.1-1.2.mga7
1.16.1-1.2.mga7
rh-nginx116-nginx
Red Hat:rhel_software_collections:3::el7
before 1:1.16.1-4.el7.1
1:1.16.1-4.el7.1
rh-nginx116-nginx-debuginfo
Red Hat:rhel_software_collections:3::el7
before 1:1.16.1-4.el7.1
1:1.16.1-4.el7.1
rh-nginx116-nginx-mod-http-image-filter
Red Hat:rhel_software_collections:3::el7
before 1:1.16.1-4.el7.1
1:1.16.1-4.el7.1
rh-nginx116-nginx-mod-http-perl
Red Hat:rhel_software_collections:3::el7
before 1:1.16.1-4.el7.1
1:1.16.1-4.el7.1
rh-nginx116-nginx-mod-http-xslt-filter
Red Hat:rhel_software_collections:3::el7
before 1:1.16.1-4.el7.1
1:1.16.1-4.el7.1
rh-nginx116-nginx-mod-mail
Red Hat:rhel_software_collections:3::el7
before 1:1.16.1-4.el7.1
1:1.16.1-4.el7.1
rh-nginx116-nginx-mod-stream
Red Hat:rhel_software_collections:3::el7
before 1:1.16.1-4.el7.1
1:1.16.1-4.el7.1
nginx
Red Hat:enterprise_linux:8::appstream
before 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
nginx-all-modules
Red Hat:enterprise_linux:8::appstream
before 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
nginx-debuginfo
Red Hat:enterprise_linux:8::appstream
before 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
nginx-debugsource
Red Hat:enterprise_linux:8::appstream
before 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
nginx-filesystem
Red Hat:enterprise_linux:8::appstream
before 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
nginx-mod-http-image-filter
Red Hat:enterprise_linux:8::appstream
before 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
nginx-mod-http-image-filter-debuginfo
Red Hat:enterprise_linux:8::appstream
before 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
nginx-mod-http-perl
Red Hat:enterprise_linux:8::appstream
before 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
nginx-mod-http-perl-debuginfo
Red Hat:enterprise_linux:8::appstream
before 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
nginx-mod-http-xslt-filter
Red Hat:enterprise_linux:8::appstream
before 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
nginx-mod-http-xslt-filter-debuginfo
Red Hat:enterprise_linux:8::appstream
before 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
nginx-mod-mail
Red Hat:enterprise_linux:8::appstream
before 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
nginx-mod-mail-debuginfo
Red Hat:enterprise_linux:8::appstream
before 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
nginx-mod-stream
Red Hat:enterprise_linux:8::appstream
before 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
nginx-mod-stream-debuginfo
Red Hat:enterprise_linux:8::appstream
before 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1
nginx
SUSE:Linux Enterprise Module for Server Applications 15 SP1
before 1.14.2-6.7.1
1.14.2-6.7.1
nginx
SUSE:Linux Enterprise High Performance Computing 15-ESPOS
before 1.16.1-3.12.7
1.16.1-3.12.7
nginx
SUSE:Linux Enterprise High Performance Computing 15-LTSS
before 1.16.1-3.12.7
1.16.1-3.12.7
nginx
SUSE:Linux Enterprise Server 15-LTSS
before 1.16.1-3.12.7
1.16.1-3.12.7
nginx
SUSE:Linux Enterprise Server for SAP Applications 15
before 1.16.1-3.12.7
1.16.1-3.12.7
nginx
Ubuntu:Pro:14.04:LTS
before 1.4.6-1ubuntu3.9+esm1, plus listed versions
1.4.1-3ubuntu11.4.3-2ubuntu11.4.4-1ubuntu11.4.4-2ubuntu11.4.4-4ubuntu1
Show 12 moreShow less
1.4.5-1ubuntu11.4.6-1ubuntu21.4.6-1ubuntu31.4.6-1ubuntu3.11.4.6-1ubuntu3.21.4.6-1ubuntu3.31.4.6-1ubuntu3.41.4.6-1ubuntu3.51.4.6-1ubuntu3.61.4.6-1ubuntu3.71.4.6-1ubuntu3.81.4.6-1ubuntu3.9
1.4.6-1ubuntu3.9+esm1
nginx
Ubuntu:16.04:LTS
before 1.10.3-0ubuntu0.16.04.5, plus listed versions
1.9.3-1ubuntu11.9.6-2ubuntu11.9.6-2ubuntu21.9.9-0ubuntu11.9.9-1ubuntu1
Show 16 moreShow less
1.9.10-0ubuntu11.9.10-1ubuntu11.9.11-0ubuntu11.9.11-0ubuntu21.9.12-0ubuntu11.9.13-0ubuntu11.9.14-0ubuntu11.9.15-0ubuntu11.10.0-0ubuntu0.16.04.11.10.0-0ubuntu0.16.04.21.10.0-0ubuntu0.16.04.31.10.0-0ubuntu0.16.04.41.10.3-0ubuntu0.16.04.11.10.3-0ubuntu0.16.04.21.10.3-0ubuntu0.16.04.31.10.3-0ubuntu0.16.04.4
1.10.3-0ubuntu0.16.04.5
nginx
Ubuntu:18.04:LTS
before 1.14.0-0ubuntu1.7, plus listed versions
1.12.1-0ubuntu21.13.6-2ubuntu11.13.6-2ubuntu21.13.10-1ubuntu11.13.12-0ubuntu1
Show 7 moreShow less
1.14.0-0ubuntu11.14.0-0ubuntu1.11.14.0-0ubuntu1.21.14.0-0ubuntu1.31.14.0-0ubuntu1.41.14.0-0ubuntu1.51.14.0-0ubuntu1.6
1.14.0-0ubuntu1.7
nginx
openSUSE:Leap 15.1
before 1.14.2-lp151.4.6.1
1.14.2-lp151.4.6.1
nginx
openSUSE:Tumbleweed
From an advisory covering 7 CVEs
before 1.21.3-1.4
1.21.3-1.4

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
PoC in GitHubvuongnv3389-sec/CVE-2019-203722022-04-06
PoC in GitHub0xleft/CVE-2019-203722023-09-16
PoC in GitHubmoften/CVE-2019-203722025-02-07

History

History
RecordedChangedSources
affected, exploits, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-20372 is a medium vulnerability (CVSS 5.3) in F5 Nginx, published January 9, 2020. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 15.0%, the 96th percentile. Fixed in nginx 1.16.1-r2.

References

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