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Fencer Vulns
high 7.5

CVE-2021-39240 json

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.

published 2021-08-17 5 y ago modified 2026-09-08 2 mo ago also BIT-haproxy-2021-39240 , EUVD-2021-25602

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.2%
EPSS 2.2% chance of exploitation in 30 days, percentile 82%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami haproxy 2.2.16, 2.3.13, 2.4.3
  • haproxy haproxy 2.2.16, 2.3.13, 2.4.3
  • haproxy Debian 14, Debian 13, Debian 12 2.2.16-1

debian advisories DEBIAN-CVE-2021-39240

  • haproxy openshift 4.8 2.2.13-2.el7
  • haproxy openshift 4.8 2.2.13-2.el8
  • haproxy openshift 4.9 2.2.15-2.el8

red hat advisories RHSA-2021:5208RHSA-2021:4118

  • haproxy openSUSE Tumbleweed 2.4.4+git0.acb1d0bea-1.2

opensuse advisories openSUSE-SU-2024:10839-1

  • haproxy Arch Linux 2.4.3-1

arch linux advisories AVG-2304

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-2021-39240 updated cvss 7.5

haproxy: does not ensure that the scheme and path portions of a URI have the expected characters

  • Red Hat OpenShift Container Platform 3.11 haproxy, haproxy18
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift Container Platform 4.8 haproxy 2.2.13-2.el7, haproxy 2.2.13-2.el8
    fixed: vendor fix RHSA-2021:5208
  • Red Hat OpenShift Container Platform 4.9 haproxy 2.2.15-2.el8
    fixed: vendor fix RHSA-2021:4118
  • Red Hat Enterprise Linux 6 haproxy Red Hat Enterprise Linux 7 haproxy Red Hat Enterprise Linux 8 haproxy Red Hat Enterprise Linux 9 haproxy Red Hat OpenShift Container Platform 4.8 ostree 2020.7-6.el8_4, ostree-libs 2020.7-6.el8_4, ostree-grub2 2020.7-6.el8_4, openshift 4.8.0-202112150047.p0.gb4b4813.assembly.stream.el7, openshift 4.8.0-202112150047.p0.gb4b4813.assembly.stream.el8, openshift-kuryr 4.8.0-202112131630.p0.g839864c.assembly.stream.el8, +6 more Red Hat OpenShift Container Platform 4.9 cri-o 1.22.0-78.rhaos4.9.gitd745cab.el8, cri-o 1.22.0-91.rhaos4.9.gitd745cab.el7, openstack-ironic 18.1.1-0.20211019162143.e0437cd.el8, openstack-ironic-api 18.1.1-0.20211019162143.e0437cd.el8, python3-ironic-tests 18.1.1-0.20211019162143.e0437cd.el8, openstack-ironic-common 18.1.1-0.20211019162143.e0437cd.el8, +10 more
    +1 more products
    Red Hat Software Collections rh-haproxy18-haproxy, rh-haproxy18-haproxy-syspaths
    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

Exploit prediction

2.21% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
bitnami haproxy
>=2.2.0, <2.2.16
>=2.3.0, <2.3.13
>=2.4.0, <2.4.3
2.2.16
2.3.13
2.4.3

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.