CVE-2021-39240

mediumpriority · track · 31EPSS 0.022 · 83 %ileDEEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

2.21% (83rd) EPSS

CVSS 5 · medium

Is it mine?

96 products

Check your exposure

Who says so?

7 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

An issue was discovered in HAProxy 2.2 before 2.2.16, 2.3 before 2.3.13, and 2.4 before 2.4.3. It does not ensure that the scheme and path portions of a URI have the expected characters. For example, the authority field (as observed on a target HTTP/2 server) might differ from what the routing rules were intended to achieve.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

Fixedhaproxy-0:2.2.15-2.el8.src as a component of Red Hat OpenShift Container Platform 4.9redhat_csaf
For OpenShift Container Platform 4.9 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.9/release_notes/ocp-4-9-release-notes.html Details on how to access this content are available at https://docs.openshift.com/container-platform/4.9/updating/updating-cluster-cli.html
https://access.redhat.com/errata/RHSA-2021:4118
Fixedhaproxy-debugsource-0:2.2.15-2.el8.aarch64 as a component of Red Hat OpenShift Container Platform 4.9redhat_csaf
For OpenShift Container Platform 4.9 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.9/release_notes/ocp-4-9-release-notes.html Details on how to access this content are available at https://docs.openshift.com/container-platform/4.9/updating/updating-cluster-cli.html
https://access.redhat.com/errata/RHSA-2021:4118
Fixedhaproxy-debugsource-0:2.2.15-2.el8.ppc64le as a component of Red Hat OpenShift Container Platform 4.9redhat_csaf
For OpenShift Container Platform 4.9 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.9/release_notes/ocp-4-9-release-notes.html Details on how to access this content are available at https://docs.openshift.com/container-platform/4.9/updating/updating-cluster-cli.html
https://access.redhat.com/errata/RHSA-2021:4118
Fixedhaproxy-debugsource-0:2.2.15-2.el8.s390x as a component of Red Hat OpenShift Container Platform 4.9redhat_csaf
For OpenShift Container Platform 4.9 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.9/release_notes/ocp-4-9-release-notes.html Details on how to access this content are available at https://docs.openshift.com/container-platform/4.9/updating/updating-cluster-cli.html
https://access.redhat.com/errata/RHSA-2021:4118
Fixedhaproxy-debugsource-0:2.2.15-2.el8.x86_64 as a component of Red Hat OpenShift Container Platform 4.9redhat_csaf
For OpenShift Container Platform 4.9 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.9/release_notes/ocp-4-9-release-notes.html Details on how to access this content are available at https://docs.openshift.com/container-platform/4.9/updating/updating-cluster-cli.html
https://access.redhat.com/errata/RHSA-2021:4118
Fixedhaproxy-0:2.2.13-2.el7.src as a component of Red Hat OpenShift Container Platform 4.8redhat_csaf
For OpenShift Container Platform 4.8 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.8/release_notes/ocp-4-8-release-notes.html Details on how to access this content are available at https://docs.openshift.com/container-platform/4.8/updating/updating-cluster-cli.html
https://access.redhat.com/errata/RHSA-2021:5208
Fixedhaproxy-0:2.2.13-2.el8.src as a component of Red Hat OpenShift Container Platform 4.8redhat_csaf
For OpenShift Container Platform 4.8 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.8/release_notes/ocp-4-8-release-notes.html Details on how to access this content are available at https://docs.openshift.com/container-platform/4.8/updating/updating-cluster-cli.html
https://access.redhat.com/errata/RHSA-2021:5208
Fixedhaproxy-debuginfo-0:2.2.13-2.el7.x86_64 as a component of Red Hat OpenShift Container Platform 4.8redhat_csaf
For OpenShift Container Platform 4.8 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.8/release_notes/ocp-4-8-release-notes.html Details on how to access this content are available at https://docs.openshift.com/container-platform/4.8/updating/updating-cluster-cli.html
https://access.redhat.com/errata/RHSA-2021:5208
Fixedhaproxy-debugsource-0:2.2.13-2.el8.ppc64le as a component of Red Hat OpenShift Container Platform 4.8redhat_csaf
For OpenShift Container Platform 4.8 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.8/release_notes/ocp-4-8-release-notes.html Details on how to access this content are available at https://docs.openshift.com/container-platform/4.8/updating/updating-cluster-cli.html
https://access.redhat.com/errata/RHSA-2021:5208
Fixedhaproxy-debugsource-0:2.2.13-2.el8.s390x as a component of Red Hat OpenShift Container Platform 4.8redhat_csaf
For OpenShift Container Platform 4.8 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.8/release_notes/ocp-4-8-release-notes.html Details on how to access this content are available at https://docs.openshift.com/container-platform/4.8/updating/updating-cluster-cli.html
https://access.redhat.com/errata/RHSA-2021:5208
Fixedhaproxy-debugsource-0:2.2.13-2.el8.x86_64 as a component of Red Hat OpenShift Container Platform 4.8redhat_csaf
For OpenShift Container Platform 4.8 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.8/release_notes/ocp-4-8-release-notes.html Details on how to access this content are available at https://docs.openshift.com/container-platform/4.8/updating/updating-cluster-cli.html
https://access.redhat.com/errata/RHSA-2021:5208

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · FSTEC (BDU) RU

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · Red Hat Product Security US

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USCWE-20US

affected products (96)

Products and version ranges known to be affected.

Amazon Linux 2all versionscert_bundDEcpe:/o:amazon:linux_2:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
n/a n/a≤ n/aenisa_euvdEU
Willy Terreau HAProxy2.2.0 → 2.2.16fstec_bduRU
Willy Terreau HAProxy2.3.0 → 2.3.13fstec_bduRU
Willy Terreau HAProxy2.4.0 → 2.4.3fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 1.6 «Смоленск»fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 4.7fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 1.7fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 10fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 11fstec_bduRU
debian debian linux= 11.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
fedoraproject fedora= 33nvdUScpe:2.3:o:fedoraproject:fedora:*:*:*:*:*:*:*:*
fedoraproject fedora= 34nvdUScpe:2.3:o:fedoraproject:fedora:*:*:*:*:*:*:*:*
haproxy haproxy2.2.0 → 2.2.16nvdUScpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*
haproxy haproxy2.3.0 → 2.3.13nvdUScpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*
haproxy haproxy2.4.0 → 2.4.3nvdUScpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*
Bitnami haproxy2.2.0 → 2.2.16osvUSpkg:bitnami/haproxy
Bitnami haproxy2.3.0 → 2.3.13osvUSpkg:bitnami/haproxy
Bitnami haproxy2.4.0 → 2.4.3osvUSpkg:bitnami/haproxy

showing 20 of 96

advisories (4)

Vendor and ecosystem advisories describing this.

RHSA-2021:4118Red Hat Security Advisory: OpenShift Container Platform 4.9.6 packages and security update2021-11-10csaf · redhat_csafUS
Red Hat OpenShift Container Platform release 4.9.6 is now available with updates to packages and images that fix several bugs and add enhancements. This release includes a security update for Red Hat OpenShift Container Platform 4.9. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
RHSA-2021:5208Red Hat Security Advisory: OpenShift Container Platform 4.8.25 security update2022-01-05csaf · redhat_csafUS
Red Hat OpenShift Container Platform release 4.8.25 is now available with updates to packages and images that fix several bugs and add enhancements. This release includes a security update for Red Hat OpenShift Container Platform 4.8. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
WID-SEC-W-2023-2456Red Hat OpenShift: Mehrere SchwachstellenDeutsch2021-11-10csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Red Hat OpenShift ausnutzen, um Dateien zu manipulieren oder Informationen offenzulegen.
BIT-haproxy-2021-392402024-03-06vendor · osvUS
An issue was discovered in HAProxy 2.2 before 2.2.16, 2.3 before 2.3.13, and 2.4 before 2.4.3. It does not ensure that the scheme and path portions of a URI have the expected characters. For example, the authority field (as observed on a target HTTP/2 server) might differ from what the routing rules were intended to achieve.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund nvd osv redhat_csaf NVD CVE.org MITRE

published 2021-08-17modified 2026-06-17

references (27)

External citations — patches, advisories, analysis.

scry

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