CVE-2019-20372

Name: CVE-2019-20372
Creator: NVD / NIST
Published: 2020-01-09T21:15:12.027+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 14.96%

Last modified Jun 17, 2026

CVE-2019-20372 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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.. EPSS estimates a 14.96% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

14.96%

96.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-444

Affected Software

Vendor	Product	Versions
F5	Nginx	< 1.17.7
Apple	Xcode	< 13.0
Canonical	Ubuntu Linux	14.04
Opensuse	Leap	15.1
Netapp	Cloud Backup	All versions

References

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

Timeline

Published: Jan 9, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-20372?

How severe is CVE-2019-20372?

CVE-2019-20372 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 14.96% probability of exploitation in the next 30 days.

How do I fix CVE-2019-20372?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-20372?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST