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Fencer Vulns
high 7.5

CVE-2024-49769 json

Waitress has a denial of service leading to high CPU usage/resource exhaustion

published 2024-10-29 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-0188 , GHSA-3f84-rpwh-47g6 , PYSEC-2024-211

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

Waitress is a Web Server Gateway Interface server for Python 2 and 3. When a remote client closes the connection before waitress has had the opportunity to call getpeername() waitress won't correctly clean up the connection leading to the main thread attempting to write to a socket that no longer exists, but not removing it from the list of sockets to attempt to process. This leads to a busy-loop calling the write function. A remote attacker could run waitress out of available sockets with very little resources required. Waitress 3.0.1 contains fixes that remove the race condition.

Patch / fix

  • pypi waitress 3.0.1
  • Pylons waitress 3.0.1
  • waitress Debian 12 2.1.2-2+deb12u1
  • waitress Debian 14, Debian 13 3.0.1-1

debian advisories DEBIAN-CVE-2024-49769

  • waitress Ubuntu 20.04 LTS 1.4.1-1ubuntu0.2
  • waitress Ubuntu 22.04 LTS 1.4.4-1.1ubuntu1.1
  • waitress Ubuntu Pro 24.04 LTS 2.1.2-2ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2024-49769

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • python-waitress openstack 17.1, openstack 16.2 2.0.0-4.el8ost
  • python3-waitress openstack 17.1, openstack 16.2 2.0.0-4.el8ost
  • python-waitress openstack 17.1 2.0.0-4.el9ost
  • python3-waitress openstack 17.1 2.0.0-4.el9ost
  • python-waitress openshift ironic 4.17, openshift ironic 4.16, openshift ironic 4.15 +3 more 3.0.1-1.el9
  • python3-waitress openshift ironic 4.17, openshift ironic 4.16, openshift ironic 4.15 +3 more 3.0.1-1.el9

red hat advisories RHSA-2025:1192RHSA-2025:1191RHSA-2025:0201RHSA-2024:10815RHSA-2024:10535RHSA-2024:10145

  • python-waitress SLES for SAP 15 SP4, SLES for SAP 15 SP3, SLES for SAP 15 SP2 +15 more 1.4.3-150000.3.9.1
  • python-waitress SLES 15 SP4-LTSS, SLE Module for Python 3 15 SP6, SLE Module for Python 3 15 SP5 +3 more 2.1.2-150400.12.7.1

suse advisories SUSE-SU-2024:4107-1SUSE-SU-2024:3876-1

  • python-waitress openSUSE Tumbleweed 3.0.2-1.7
  • python-waitress openSUSE Tumbleweed 3.0.1-1.1

opensuse advisories openSUSE-SU-2026:12047-1openSUSE-SU-2024:14445-1

  • python-waitress Azure Linux 3.0 3.0.1-1

azure linux advisories AZL-51831

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-49769 updated cvss 7.5

waitress: Waitress has a denial of service leading to high CPU usage/resource exhaustion

  • Red Hat Ceph Storage 4 python-waitress, python3-waitress Red Hat Ceph Storage 5 python-waitress
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Openshift Container Storage 4 python-waitress
    affected: workaround, no fix available
  • Red Hat Ironic content for Red Hat OpenShift Container Platform 4.12 python-waitress 3.0.1-1.el9, python3-waitress 3.0.1-1.el9
    fixed: vendor fix RHSA-2024:10535
  • Red Hat Ironic content for Red Hat OpenShift Container Platform 4.13 python-waitress 3.0.1-1.el9, python3-waitress 3.0.1-1.el9
    fixed: vendor fix RHSA-2024:10815
  • Red Hat Ironic content for Red Hat OpenShift Container Platform 4.14 python-waitress 3.0.1-1.el9, python3-waitress 3.0.1-1.el9
    fixed: vendor fix RHSA-2024:9623
  • Red Hat Ironic content for Red Hat OpenShift Container Platform 4.15 python-waitress 3.0.1-1.el9, python3-waitress 3.0.1-1.el9
    fixed: vendor fix RHSA-2024:10145
  • Red Hat Ironic content for Red Hat OpenShift Container Platform 4.16 python-waitress 3.0.1-1.el9, python3-waitress 3.0.1-1.el9
    fixed: vendor fix RHSA-2024:9618
  • Red Hat Ironic content for Red Hat OpenShift Container Platform 4.17 python-waitress 3.0.1-1.el9, python3-waitress 3.0.1-1.el9
    fixed: vendor fix RHSA-2024:9613
show 3 more
  • Red Hat OpenStack Platform 16.2 python-waitress 2.0.0-4.el8ost, python3-waitress 2.0.0-4.el8ost
    fixed: vendor fix RHSA-2025:0201
  • Red Hat OpenStack Platform 17.1 python-waitress 2.0.0-4.el8ost, python-waitress 2.0.0-4.el9ost, python3-waitress 2.0.0-4.el8ost, python3-waitress 2.0.0-4.el9ost
    fixed: vendor fix RHSA-2025:1192
  • Red Hat OpenShift Container Platform 4.12 kernel-rt 4.18.0-372.131.1.rt7.291.el8_6, kernel-rt-kvm 4.18.0-372.131.1.rt7.291.el8_6, kernel-rt-core 4.18.0-372.131.1.rt7.291.el8_6, kernel-rt-modules 4.18.0-372.131.1.rt7.291.el8_6, kernel-rt-debug-kvm 4.18.0-372.131.1.rt7.291.el8_6, kernel-rt-debug-core 4.18.0-372.131.1.rt7.291.el8_6, +11 more Red Hat OpenShift Container Platform 4.13 openshift 4.13.0-202411110736.p0.g53fd427.assembly.stream.el8, openshift 4.13.0-202411110736.p0.g53fd427.assembly.stream.el9, openshift-hyperkube 4.13.0-202411110736.p0.g53fd427.assembly.stream.el8, openshift-hyperkube 4.13.0-202411110736.p0.g53fd427.assembly.stream.el9 Red Hat OpenShift Container Platform 4.14 openshift 4.14.0-202411110739.p0.g03a907c.assembly.stream.el8, openshift 4.14.0-202411110739.p0.g03a907c.assembly.stream.el9, openshift-hyperkube 4.14.0-202411110739.p0.g03a907c.assembly.stream.el8, openshift-hyperkube 4.14.0-202411110739.p0.g03a907c.assembly.stream.el9 Red Hat OpenShift Container Platform 4.16 kata-containers 3.7.0-4.rhaos4.16.el9, openshift 4.16.0-202411111337.p0.g7423cac.assembly.stream.el8, openshift 4.16.0-202411111337.p0.g7423cac.assembly.stream.el9, openshift-kubelet 4.16.0-202411111337.p0.g7423cac.assembly.stream.el8, openshift-kubelet 4.16.0-202411111337.p0.g7423cac.assembly.stream.el9, openshift-hyperkube 4.16.0-202411111337.p0.g7423cac.assembly.stream.el8, +7 more Red Hat OpenShift Container Platform 4.17 kata-containers 3.7.0-4.rhaos4.17.el9, openshift 4.17.0-202411070335.p0.g82afd77.assembly.stream.el8, openshift 4.17.0-202411070335.p0.g82afd77.assembly.stream.el9, openshift-ansible 4.17.0-202411120704.p0.g5c737da.assembly.stream.el8, openshift-ansible 4.17.0-202411120704.p0.g5c737da.assembly.stream.el9, openshift-kubelet 4.17.0-202411070335.p0.g82afd77.assembly.stream.el8, +11 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

1.38% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
pypi waitress
<3.0.1
3.0.1

Affected products

  • Pylons waitress

Classification

Weakness
  • CWE-772 Missing Release of Resource after Effective Lifetime

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.