CVE-2019-20372
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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 15.0%, higher than 97% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.1
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- EPSS
- 14.96% probability · 97th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-444
- Affected
- f5/nginx · apple/xcode · canonical/ubuntu linux · opensuse/leap · netapp/cloud backup
- Source
- cve@mitre.org
EPSS 15.0% since 3 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.