CVE-2019-16792 HIGH

CVE-2019-16792: HTTP Request Smuggling: Content-Length Sent Twice in Waitress

Vendor Pylons
Product Waitress
Weakness CWE-444
Published January 22, 2020
Last update August 5, 2024
View on NVD All CVEs

CVSS base score

7.1/10
Attack vector Network
Attack complexity High
Privileges required Low
User interaction None
Confidentiality High
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

Waitress through version 1.3.1 allows request smuggling by sending the Content-Length header twice. Waitress would header fold a double Content-Length header and due to being unable to cast the now comma separated value to an integer would set the Content-Length to 0 internally. If two Content-Length headers are sent in a single request, Waitress would treat the request as having no body, thereby treating the body of the request as a new request in HTTP pipelining. This issue is fixed in Waitress 1.4.0.

Key dates

02Disclosure timeline

January 22, 2020 CVE published
August 5, 2024 Record updated