What is CVE-2019-16792?

CVE-2019-16792 is a high-severity vulnerability in Agendaless Waitress, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 7.1/10. Published 2020-01-22.

How severe is CVE-2019-16792?

High severity. CVSS v3 base score is 7.1 out of 10.

Vulnerability in Agendaless Waitress

CVE-2019-16792

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.

Vulnerability class: HTTP Request Smuggling

Published 2020-01-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N.

EPSS exploit prediction

EPSS: 0.020 (79.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 79.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000

Affected products

Agendaless Waitress
Oracle Communications Cloud Native Core Network Function Environment — versions 1.10.0
Pylons Waitress — versions <= 1.3.1
Debian Linux — versions 9.0

Weakness classification (CWE)

CWE-444 — Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling)

References

www.oracle.com/security-alerts/cpuapr2022.html (Patch, Third Party Advisory)
docs.pylonsproject.org/projects/waitress/en/latest/ (Release Notes)
github.com/Pylons/waitress/security/advisories/GHSA-4ppp-gpcr-7qf6 (Third Party Advisory)
github.com/Pylons/waitress/commit/575994cd42e83fd772a5f7ec98b2c56751bd3f65 (Patch)
lists.debian.org/debian-lts-announce/2022/05/msg00011.html (mailing-list, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2019-16792?: CVE-2019-16792 is a high-severity vulnerability in Agendaless Waitress, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 7.1/10. Published 2020-01-22.
How severe is CVE-2019-16792?: High severity. CVSS v3 base score is 7.1 out of 10.