CVE-2019-20372

MEDIUMCVSS 5.3

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.

CVSS v3: 5.3
EG Score: —
EPSS: —
KEV: Not listed

Published

January 9, 2020

Last Modified

November 21, 2024

References (22)

cve@mitrehttp://lists.opensuse.org/opensuse-security-announce/2020-02/msg00013.html
cve@mitrehttp://nginx.org/en/CHANGES
cve@mitrehttp://seclists.org/fulldisclosure/2021/Sep/36
cve@mitrehttps://bertjwregeer.keybase.pub/2019-12-10%20-%20error_page%20request%20smuggling.pdf
cve@mitrehttps://duo.com/docs/dng-notes#version-1.5.4-january-2020
cve@mitrehttps://github.com/kubernetes/ingress-nginx/pull/4859
cve@mitrehttps://github.com/nginx/nginx/commit/c1be55f97211d38b69ac0c2027e6812ab8b1b94e
cve@mitrehttps://security.netapp.com/advisory/ntap-20200127-0003/
cve@mitrehttps://support.apple.com/kb/HT212818
cve@mitrehttps://usn.ubuntu.com/4235-1/
cve@mitrehttps://usn.ubuntu.com/4235-2/
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00013.html
af854a3a-2127-422b-91ae-364da2661108http://nginx.org/en/CHANGES
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2021/Sep/36
af854a3a-2127-422b-91ae-364da2661108https://bertjwregeer.keybase.pub/2019-12-10%20-%20error_page%20request%20smuggling.pdf

Patch Availability(6)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	nginx-light (1.4.6-1ubuntu3.9+esm1) @ trusty	2026-05-27	ubuntu
ubuntu	nginx-light (1.14.0-0ubuntu1.7) @ bionic	2026-05-27	ubuntu
redhat	ansible-tower-36/ansible-tower:3.6.7-1	2021-03-09	redhat
redhat	ansible-tower-37/ansible-tower-rhel7:3.7.5-1	2021-03-09	redhat
redhat	nginx:1.16-8030020201124104955.229f0a1c	2020-12-15	redhat
redhat	rh-nginx116-nginx-1:1.16.1-4.el7.1	2020-07-02	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-444Inconsistent Interpretation of HTTP Requests (HTTP Request Smuggling)

All Vendor Advisories

(7)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 6× in last 7d / 6× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:38 UTCepss_batch
2026-05-27 09:25 UTCEG score recompute
2026-05-27 09:25 UTCVendor advisory
2026-05-27 09:25 UTCGHSA enrichment
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch

Frequently asked(4)

What is CVE-2019-20372?

CVE-2019-20372 is a medium vulnerability published on January 9, 2020. 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.

When was CVE-2019-20372 disclosed?

CVE-2019-20372 was first published in the National Vulnerability Database on January 9, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

What is the CVSS score of CVE-2019-20372?

CVE-2019-20372 has a CVSS v3 base score of 5.3 (NVD).

How do I remediate CVE-2019-20372?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-20372, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2019-20372

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CVE-2019-20372

Published

Last Modified

References (22)

Patch Availability(6)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(4)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2019-20372?

Same vendor

Same CWE

CVE-2019-20372

📅 Published

🔄 Last Modified

🔗 References (22)

Patch Availability(6)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(4)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2019-20372?

🔗 Related CVEs(same vendor + same CWE)

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References (22)

Frequently asked(4)

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