CVE-2019-16792

HTTP Request Smuggling: Content-Length Sent Twice in Waitress

HIGH
7.5
CVSS Score
Published: January 22, 2020 at 06:30 PM UTC
Updated: June 17, 2026 at 02:22 AM UTC
4 products affected across 4 vendorsDebian LinuxCommunications Cloud Native Core Network Function Cloud Native EnvironmentWaitress

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Severity
HIGH7.5
Exploit prediction
EPSS 2%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-444

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