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CVE-2019-16789

27
FAUCET Score

CVE-2019-16789 describes an HTTP request smuggling vulnerability in Waitress versions through 1.4.0, affecting products like Debian, Oracle, and Red Hat. This flaw allows an attacker to bypass a front-end proxy by sending specially crafted requests with invalid Transfer-Encoding headers, leading to different parsing by Waitress. With a CVSS score of 8.2 (HIGH), the vulnerability has a network attack vector, low complexity, and can result in information disclosure or cache poisoning. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.4.0CPE matchmatch criteria
cpe:2.3:a:agendaless:waitress:*:*:*:*:*:*:*:*
1.10.0CPE matchmatch criteria
cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:1.10.0:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
30CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
31CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.1HIGH

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
1.8
Impact Score
4.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.59%
Probability of exploitation in next 30 days
EPSS Percentile
83.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0259 is in the 71st percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (19)

github_advisorypatch availablevia nvd_reference
View patch
oraclepatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: waitressFixed in: 1.4.2
redhatpatch availablevia redhat_api
Product: Red Hat Quay 3Fixed in: quay/quay-bridge-operator-bundle:v3.4.0-3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Quay 3Fixed in: quay/quay-bridge-operator-rhel8:v3.4.0-17
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Quay 3Fixed in: quay/quay-builder-qemu-rhcos-rhel8:v3.4.0-17
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Quay 3Fixed in: quay/quay-builder-rhel8:v3.4.0-18
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Quay 3Fixed in: quay/quay-container-security-operator-rhel8:v3.4.0-2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Quay 3Fixed in: quay/quay-openshift-bridge-rhel8-operator:v3.4.0-17
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Quay 3Fixed in: quay/quay-operator-bundle:v3.4.0-89
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Quay 3Fixed in: quay/quay-operator-rhel8:v3.4.0-132
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Quay 3Fixed in: quay/quay-rhel8:v3.4.0-51
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Quay 3Fixed in: quay/quay-container-security-operator-bundle:v3.4.0-2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenStack Platform 15.0 (Stein)Fixed in: python-waitress-0:1.4.2-1.el8ost
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Quay 3Fixed in: quay/clair-rhel8:v3.4.0-25
View patch
redhatvendor investigatingvia redhat_api
Product: Red Hat Ceph Storage 3Fixed in: python-waitress
redhatvendor investigatingvia redhat_api
Product: Red Hat Ceph Storage 4Fixed in: python-waitress
redhatno patchvia redhat_api
Product: Red Hat OpenStack Platform 16 (Train)Fixed in: python-waitress
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 13 (Queens)Fixed in: python-waitress

Vendor Advisories (2)

pipGHSA-968f-66r5-5v74medium

HTTP Request Smuggling in Waitress: Invalid whitespace characters in headers (Follow-up)

Jan 6, 2020
redhatCVE-2019-16789Important

waitress: HTTP Request Smuggling through Invalid whitespace characters in headers

Dec 26, 2019

References

access.redhat.com / errata/RHSA-2020:0720
Third Party Advisory
docs.pylonsproject.org / projects/waitress/en/latest
Release NotesVendor Advisory
github.com / github/advisory-review/pull/14604
Broken LinkThird Party Advisory
github.com / Pylons/waitress/commit/11d9e138125ad46e951027184b13242a3c1de017
PatchThird Party Advisory
lists.debian.org / debian-lts-announce/2022/05/msg00011.html
Mailing ListThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/GVDHR2DNKCNQ7YQXISJ45NT4IQDX3LJ7
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/LYEOTGWJZVKPRXX2HBNVIYWCX73QYPM5
oracle.com / security-alerts/cpuapr2022.html
PatchThird Party Advisory