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Fencer Vulns
high 7.2

CVE-2023-40225 json

HAProxy through 2.0.32, 2.1.x and 2.2.x through 2.2.30, 2.3.x and 2.4.x through 2.4.23, 2.5.x and 2.6.x before 2.6.15, 2.7.x before 2.7.10,…

published 2023-08-10 3 y ago modified 2026-09-08 2 mo ago also BIT-haproxy-2023-40225 , EUVD-2023-44822

cvss
7.2
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.1%
EPSS 2.1% chance of exploitation in 30 days, percentile 82%
public exploits
0
none known

Summary

HAProxy through 2.0.32, 2.1.x and 2.2.x through 2.2.30, 2.3.x and 2.4.x through 2.4.23, 2.5.x and 2.6.x before 2.6.15, 2.7.x before 2.7.10, and 2.8.x before 2.8.2 forwards empty Content-Length headers, violating RFC 9110 section 8.6. In uncommon cases, an HTTP/1 server behind HAProxy may interpret the payload as an extra request.

Patch / fix

  • bitnami haproxy 2.0.33, 2.2.31, 2.4.24, 2.6.15, 2.7.10, 2.8.2
  • haproxy haproxy 2.6.15, 2.7.10, 2.8.2
  • haproxy Debian 12 2.6.12-1+deb12u1
  • haproxy Debian 14, Debian 13 2.6.15-1

debian advisories DEBIAN-CVE-2023-40225

  • haproxy Ubuntu 20.04 LTS 2.0.31-0ubuntu0.2
  • haproxy Ubuntu 22.04 LTS 2.4.22-0ubuntu0.22.04.2

ubuntu advisories UBUNTU-CVE-2023-40225

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

  • haproxy openshift 4.14 2.6.13-2.rhaos4.14.el8
  • haproxy26 openshift 4.14 2.6.13-2.rhaos4.14.el8
  • python-werkzeug openshift ironic 4.14 2.2.3-2.el9
  • python3-werkzeug openshift ironic 4.14 2.2.3-2.el9
  • haproxy RHEL 9 2.4.22-3.el9_3
  • haproxy openshift 4.11 2.2.24-4.rhaos4.11.el8
  • haproxy22 openshift 4.11 2.2.24-4.rhaos4.11.el8
  • haproxy openshift 4.12 2.2.24-4.rhaos4.12.el8

red hat advisories RHSA-2023:7473RHSA-2024:1142RHSA-2024:1089RHSA-2024:0308RHSA-2024:0200RHSA-2023:7606

  • haproxy SLE High Availability Extension 15 SP1 2.0.31-150100.8.34.1
  • haproxy SLE High Availability Extension 15 SP3, SLE High Availability Extension 15 SP2 2.0.31-150200.11.23.1
  • haproxy SLE Micro 5.4, SLE Micro 5.3, SLE High Availability Extension 15 SP5 +5 more 2.4.22+git0.f8e3218e2-150400.3.16.1

suse advisories SUSE-SU-2023:4646-1SUSE-SU-2023:3490-1SUSE-SU-2023:3469-1

  • haproxy openSUSE Tumbleweed 2.8.2+git0.61a0f576a-2.1

opensuse advisories openSUSE-SU-2024:13116-1

  • haproxy AlmaLinux 9 2.4.22-3.el9_3

almalinux advisories ALSA-2024:1142

  • haproxy CBL-Mariner 2.0 2.4.24-1

azure linux advisories AZL-27912

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-2023-40225 updated cvss 7.5

haproxy: Proxy forwards malformed empty Content-Length headers

  • Red Hat Ceph Storage 5 haproxy, haproxy22 Red Hat Enterprise Linux 6 haproxy Red Hat Enterprise Linux 7 haproxy Red Hat OpenShift Container Platform 3.11 haproxy, haproxy18
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Software Collections rh-haproxy18-haproxy, rh-haproxy18-haproxy-syspaths
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux AppStream (v. 9) haproxy 2.4.22-3.el9_3
    fixed: vendor fix RHSA-2024:1142
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) haproxy 2.4.17-6.el9_2.2
    fixed: vendor fix RHSA-2024:1089
  • Red Hat OpenShift Container Platform 4.11 haproxy 2.2.24-4.rhaos4.11.el8, haproxy22 2.2.24-4.rhaos4.11.el8
    fixed: vendor fix RHSA-2024:0308
  • Red Hat OpenShift Container Platform 4.12 haproxy 2.2.24-4.rhaos4.12.el8, haproxy22 2.2.24-4.rhaos4.12.el8
    fixed: vendor fix RHSA-2024:0200
  • Red Hat OpenShift Container Platform 4.13 haproxy 2.2.24-4.rhaos4.13.el8, haproxy22 2.2.24-4.rhaos4.13.el8
    fixed: vendor fix RHSA-2023:7606
  • Red Hat OpenShift Container Platform 4.14 haproxy 2.6.13-2.rhaos4.14.el8, haproxy26 2.6.13-2.rhaos4.14.el8
    fixed: vendor fix RHSA-2023:7473
show 1 more
  • Red Hat Cryostat 2 haproxy Red Hat Ironic content for Red Hat OpenShift Container Platform 4.14 python-werkzeug 2.2.3-2.el9, python-eventlet 0.33.1-5.el9, python3-werkzeug 2.2.3-2.el9, python-markupsafe 2.1.1-4.el9, python3-eventlet 0.33.1-5.el9, python3-markupsafe 2.1.1-4.el9 Red Hat Enterprise Linux 8 haproxy Red Hat OpenShift Container Platform 4.11 containernetworking-plugins 1.4.0-1.rhaos4.11.el8 Red Hat OpenShift Container Platform 4.12 perf 4.18.0-372.87.1.el8_6, kernel 4.18.0-372.87.1.el8_6, bpftool 4.18.0-372.87.1.el8_6, kernel-core 4.18.0-372.87.1.el8_6, kernel-tools 4.18.0-372.87.1.el8_6, python3-perf 4.18.0-372.87.1.el8_6, +42 more Red Hat OpenShift Container Platform 4.13 perf 5.14.0-284.43.1.el9_2, rtla 5.14.0-284.43.1.el9_2, bpftool 7.0.0-284.43.1.el9_2, kernel 5.14.0-284.43.1.el9_2, kernel-64k 5.14.0-284.43.1.el9_2, kernel-core 5.14.0-284.43.1.el9_2, +66 more
    +1 more products
    Red Hat OpenShift Container Platform 4.14 cri-o 1.27.2-2.rhaos4.14.git9d684e2.el8, cri-o 1.27.2-2.rhaos4.14.git9d684e2.el9, openshift 4.14.0-202311161233.p0.gd548052.assembly.stream.el8, openshift 4.14.0-202311161233.p0.gd548052.assembly.stream.el9, openshift-hyperkube 4.14.0-202311161233.p0.gd548052.assembly.stream.el8, openshift-hyperkube 4.14.0-202311161233.p0.gd548052.assembly.stream.el9
    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
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

2.15% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/haproxy/haproxy/issues/2237 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
OSV 3.1 7.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
bitnami haproxy
<2.0.33
>=2.2.0, <2.2.31
>=2.4.0, <2.4.24
>=2.5.0, <2.6.15
>=2.7.0, <2.7.10
>=2.8.0, <2.8.2
2.0.33
2.2.31
2.4.24
2.6.15
2.7.10
2.8.2

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests

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.