CVE-2019-16869

Netty vulnerability

CVSS

7.5

EPSS

8.4%

EPSS pct

94th

Exploited

No known

Netty before 4.1.42.Final mishandles whitespace before the colon in HTTP headers (such as a "Transfer-Encoding : chunked" line), which leads to HTTP request smuggling.

Affected vendor

Netty

Affected product

Netty

CVSS vector

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

Weakness type (CWE)

CWE-444 — HTTP Request Smuggling

Published

2019-09-26

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 high impact to integrity.

Its EPSS score of 8.4% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 94% of all scored CVEs.

Check your external exposure to CVE-2019-16869

Confirm whether Netty Netty is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2019-16869.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2019-16869

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2019-16869 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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