What’s Vulnerable › Vulnerabilities

CVE-2019-20372

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 15.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-01-09 · updated 2026-06-17
• Weakness: CWE-444

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.

Affected products

• Apple Xcode: before 13.0 — fixed in 13.0
• Canonical Ubuntu Linux: 14.04
• nginx: before 1.17.7 — fixed in 1.17.7
• NetApp Cloud Backup: all versions
• openSUSE Leap: 15.1

How to fix

Upgrade to a fixed version: Apple Xcode 13.0; nginx 1.17.7. Check the vendor advisory for mitigations.

References

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

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