CVE-2019-17569

Low

No strong exploitation signal.

CVSS base

4.8 MEDIUM

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

EPSS — probability of exploitation (30 days)

8.9%

95.0th percentile

CISA KEV

Not listed

Weakness / dates

CWE-444

Published 2020-02-24 · modified 2026-08-25

CVSS breakdown

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

Attack Vector	N	Network
Attack Complexity	H	High
Privileges Required	N	None
User Interaction	N	None
Scope	U	Unchanged
Confidentiality	L	Low
Integrity	L	Low
Availability	N	None

Timeline

2020-02-24 — Published (NVD)
2026-08-25 — Last modified (NVD)

Description

The refactoring present in Apache Tomcat 9.0.28 to 9.0.30, 8.5.48 to 8.5.50 and 7.0.98 to 7.0.99 introduced a regression. The result of the regression was that invalid Transfer-Encoding headers were incorrectly processed leading to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.

Affected

apache debian netapp opensuse oracle

References

Official: NVD · CVE.org