CVE-2019-20372

Nginx vulnerability

CVSS

5.3

EPSS

15.0%

EPSS pct

96th

Exploited

No known

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 vendor

Affected product

Nginx

CVSS vector

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

Weakness type (CWE)

CWE-444 — HTTP Request Smuggling

Published

2020-01-09

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to low impact to confidentiality.

Its EPSS score of 15.0% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 96% of all scored CVEs.

Check your external exposure to CVE-2019-20372

Confirm whether F5 Nginx is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2019-20372.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2019-20372

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2019-20372 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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