haproxy: Mishandling of priority flag in short HEADERS frame by HTTP/2 decoder allows for crash
Published Mar 18, 2019
7.5
HIGHCVSS 3.0
EPSS 4.46%
Description
An out-of-bounds read issue was discovered in the HTTP/2 protocol decoder in HAProxy 1.8.x and 1.9.x through 1.9.0 which can result in a crash. The processing of the PRIORITY flag in a HEADERS frame requires 5 extra bytes, and while these bytes are skipped, the total frame length was not re-checked to make sure they were present in the frame.
Affected products
No data.
Configuration 1
- ≥ 1.8.0 · ≤ 1.8.19
- 1.9.0
- 1.9.0
- 1.9.0
- 1.9.0
- 1.9.0
- 1.9.0
- 1.9.0
- 1.9.0
- 1.9.0
- 1.9.0
- 1.9.0
- 1.9.0
- 1.9.0
Configuration 3
- 16.04
- 18.04
- 18.10
Configuration 4
- 3.11
- 7.0
- 7.4
- 7.5
- 7.6
No data.
Red Hat OpenShift Container Platform 3.10
haproxy-0:1.8.17-3.el7
Fixed · RHSA-2019:0548
Red Hat OpenShift Container Platform 3.11
atomic-enterprise-service-catalog-1:3.11.82-1.git.1673.133961e.el7
Fixed · RHBA-2019:0326
Red Hat OpenShift Container Platform 3.11
atomic-openshift-0:3.11.82-1.git.0.08bc31b.el7
Fixed · RHBA-2019:0326
Red Hat OpenShift Container Platform 3.11
atomic-openshift-cluster-autoscaler-0:3.11.82-1.git.0.efb6af0.el7
Fixed · RHBA-2019:0326
Red Hat OpenShift Container Platform 3.11
atomic-openshift-descheduler-0:3.11.82-1.git.300.89765c9.el7
Fixed · RHBA-2019:0326
Red Hat OpenShift Container Platform 3.11
atomic-openshift-dockerregistry-0:3.11.82-1.git.452.0ce6383.el7
Fixed · RHBA-2019:0326
Red Hat OpenShift Container Platform 3.11
atomic-openshift-metrics-server-0:3.11.82-1.git.52.2fdca3f.el7
Fixed · RHBA-2019:0326
Red Hat OpenShift Container Platform 3.11
atomic-openshift-node-problem-detector-0:3.11.82-1.git.254.a448936.el7
Fixed · RHBA-2019:0326
Red Hat OpenShift Container Platform 3.11
atomic-openshift-service-idler-0:3.11.82-1.git.14.e353758.el7
Fixed · RHBA-2019:0326
Red Hat OpenShift Container Platform 3.11
atomic-openshift-web-console-0:3.11.82-1.git.355.5e8b1d9.el7
Fixed · RHBA-2019:0326
Red Hat OpenShift Container Platform 3.11
golang-github-openshift-oauth-proxy-0:3.11.82-1.git.425.7cac034.el7
Fixed · RHBA-2019:0326
Red Hat OpenShift Container Platform 3.11
golang-github-prometheus-alertmanager-0:3.11.82-1.git.0.3bf41ce.el7
Fixed · RHBA-2019:0326
Red Hat OpenShift Container Platform 3.11
golang-github-prometheus-node_exporter-0:3.11.82-1.git.1063.48444e8.el7
Fixed · RHBA-2019:0326
Red Hat OpenShift Container Platform 3.11
golang-github-prometheus-prometheus-0:3.11.82-1.git.5027.9d24833.el7
Fixed · RHBA-2019:0326
Red Hat OpenShift Container Platform 3.11
haproxy-0:1.8.17-3.el7
Fixed · RHBA-2019:0326
Red Hat OpenShift Container Platform 3.11
jenkins-0:2.150.2.1549032159-1.el7
Fixed · RHBA-2019:0326
Red Hat OpenShift Container Platform 3.11
jenkins-2-plugins-0:3.11.1549642489-1.el7
Fixed · RHBA-2019:0326
Red Hat OpenShift Container Platform 3.11
openshift-ansible-0:3.11.82-3.git.0.9718d0a.el7
Fixed · RHBA-2019:0326
Red Hat OpenShift Container Platform 3.11
openshift-enterprise-autoheal-0:3.11.82-1.git.219.0b5aff4.el7
Fixed · RHBA-2019:0326
Red Hat OpenShift Container Platform 3.11
openshift-enterprise-cluster-capacity-0:3.11.82-1.git.380.cf11c51.el7
Fixed · RHBA-2019:0326
Red Hat OpenShift Container Platform 3.9
haproxy-0:1.8.17-3.el7
Fixed · RHSA-2019:0547
Red Hat Software Collections for Red Hat Enterprise Linux 7
rh-haproxy18-haproxy-0:1.8.4-4.el7
Fixed · RHSA-2019:0275
Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS
rh-haproxy18-haproxy-0:1.8.4-4.el7
Fixed · RHSA-2019:0275
Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS
rh-haproxy18-haproxy-0:1.8.4-4.el7
Fixed · RHSA-2019:0275
Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS
rh-haproxy18-haproxy-0:1.8.4-4.el7
Fixed · RHSA-2019:0275
Red Hat Enterprise Linux 6
haproxy
Not affected
Red Hat Enterprise Linux 7
haproxy
Not affected
Red Hat Enterprise Linux 8
haproxy
Not affected
Red Hat OpenShift Container Platform 3.7
haproxy
Not affected
Red Hat OpenShift Container Platform 4
haproxy
Not affected
Red Hat OpenStack Platform 12 (Pike)
rhosp12/openstack-haproxy
Out of support scope
Red Hat OpenStack Platform 13 (Queens)
rhosp13/openstack-haproxy
Not affected
Red Hat OpenStack Platform 14 (Rocky)
openstack-haproxy-container
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat OpenShift Container Platform 3.10 | haproxy-0:1.8.17-3.el7 | Fixed | RHSA-2019:0548 |
| Red Hat OpenShift Container Platform 3.11 | atomic-enterprise-service-catalog-1:3.11.82-1.git.1673.133961e.el7 | Fixed | RHBA-2019:0326 |
| Red Hat OpenShift Container Platform 3.11 | atomic-openshift-0:3.11.82-1.git.0.08bc31b.el7 | Fixed | RHBA-2019:0326 |
| Red Hat OpenShift Container Platform 3.11 | atomic-openshift-cluster-autoscaler-0:3.11.82-1.git.0.efb6af0.el7 | Fixed | RHBA-2019:0326 |
| Red Hat OpenShift Container Platform 3.11 | atomic-openshift-descheduler-0:3.11.82-1.git.300.89765c9.el7 | Fixed | RHBA-2019:0326 |
| Red Hat OpenShift Container Platform 3.11 | atomic-openshift-dockerregistry-0:3.11.82-1.git.452.0ce6383.el7 | Fixed | RHBA-2019:0326 |
| Red Hat OpenShift Container Platform 3.11 | atomic-openshift-metrics-server-0:3.11.82-1.git.52.2fdca3f.el7 | Fixed | RHBA-2019:0326 |
| Red Hat OpenShift Container Platform 3.11 | atomic-openshift-node-problem-detector-0:3.11.82-1.git.254.a448936.el7 | Fixed | RHBA-2019:0326 |
| Red Hat OpenShift Container Platform 3.11 | atomic-openshift-service-idler-0:3.11.82-1.git.14.e353758.el7 | Fixed | RHBA-2019:0326 |
| Red Hat OpenShift Container Platform 3.11 | atomic-openshift-web-console-0:3.11.82-1.git.355.5e8b1d9.el7 | Fixed | RHBA-2019:0326 |
| Red Hat OpenShift Container Platform 3.11 | golang-github-openshift-oauth-proxy-0:3.11.82-1.git.425.7cac034.el7 | Fixed | RHBA-2019:0326 |
| Red Hat OpenShift Container Platform 3.11 | golang-github-prometheus-alertmanager-0:3.11.82-1.git.0.3bf41ce.el7 | Fixed | RHBA-2019:0326 |
| Red Hat OpenShift Container Platform 3.11 | golang-github-prometheus-node_exporter-0:3.11.82-1.git.1063.48444e8.el7 | Fixed | RHBA-2019:0326 |
| Red Hat OpenShift Container Platform 3.11 | golang-github-prometheus-prometheus-0:3.11.82-1.git.5027.9d24833.el7 | Fixed | RHBA-2019:0326 |
| Red Hat OpenShift Container Platform 3.11 | haproxy-0:1.8.17-3.el7 | Fixed | RHBA-2019:0326 |
| Red Hat OpenShift Container Platform 3.11 | jenkins-0:2.150.2.1549032159-1.el7 | Fixed | RHBA-2019:0326 |
| Red Hat OpenShift Container Platform 3.11 | jenkins-2-plugins-0:3.11.1549642489-1.el7 | Fixed | RHBA-2019:0326 |
| Red Hat OpenShift Container Platform 3.11 | openshift-ansible-0:3.11.82-3.git.0.9718d0a.el7 | Fixed | RHBA-2019:0326 |
| Red Hat OpenShift Container Platform 3.11 | openshift-enterprise-autoheal-0:3.11.82-1.git.219.0b5aff4.el7 | Fixed | RHBA-2019:0326 |
| Red Hat OpenShift Container Platform 3.11 | openshift-enterprise-cluster-capacity-0:3.11.82-1.git.380.cf11c51.el7 | Fixed | RHBA-2019:0326 |
| Red Hat OpenShift Container Platform 3.9 | haproxy-0:1.8.17-3.el7 | Fixed | RHSA-2019:0547 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | rh-haproxy18-haproxy-0:1.8.4-4.el7 | Fixed | RHSA-2019:0275 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS | rh-haproxy18-haproxy-0:1.8.4-4.el7 | Fixed | RHSA-2019:0275 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | rh-haproxy18-haproxy-0:1.8.4-4.el7 | Fixed | RHSA-2019:0275 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | rh-haproxy18-haproxy-0:1.8.4-4.el7 | Fixed | RHSA-2019:0275 |
| Red Hat Enterprise Linux 6 | haproxy | Not affected | n/a |
| Red Hat Enterprise Linux 7 | haproxy | Not affected | n/a |
| Red Hat Enterprise Linux 8 | haproxy | Not affected | n/a |
| Red Hat OpenShift Container Platform 3.7 | haproxy | Not affected | n/a |
| Red Hat OpenShift Container Platform 4 | haproxy | Not affected | n/a |
| Red Hat OpenStack Platform 12 (Pike) | rhosp12/openstack-haproxy | Out of support scope | n/a |
| Red Hat OpenStack Platform 13 (Queens) | rhosp13/openstack-haproxy | Not affected | n/a |
| Red Hat OpenStack Platform 14 (Rocky) | openstack-haproxy-container | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
HTTP/2 support was added to haproxy in version 1.8, therefore OpenShift Container Platform (OCP) 3.7 and earlier are unaffected by this flaw, see [1]. OCP 3.11 added a configuration option to ose-haproxy-router that made enabling HTTP/2 support easy, [2]. Prior to that, in versions OCP 3.9 and 3.10, an administrator had to customize the haproxy router configuration to add HTTP/2 support, [3]. OCP 3.9, and 3.10 are rated as moderate because HTTP/2 support was not a standard configuration option, and therefore unlikely to be enabled. Versions of haproxy included in Red Hat Enterprise Linux 6 and 7, excluding rh-haproxy18-haproxy in Red Hat Software Collections, are unaffected as they package versions of haproxy before 1.7. [1] http://www.haproxy.org/news.html [2] https://github.com/openshift/origin/pull/19968 [3] https://docs.openshift.com/container-platform/3.10/install_config/router/customized_haproxy_router.html
Red Hat mitigation
HTTP/2 support is disabled by default on OpenShift Container Platform 3.11. To mitigate this vulnerability keep it disabled. You can verify if HTTP/2 support is enabled by following the instructions in the upstream pull request, [1]. [1] https://github.com/openshift/origin/pull/19968
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
AV:N/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (17 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 4.46% (0.04459) | 91.13th | v5 (v2026.06.15) |
| Jun 15, 2026 | 4.46% (0.04459) | 90.17th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.19% (0.00193) | 39.19th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.43% (0.00427) | 75.18th | v3 (v2023.03.01) |
| Apr 15, 2024 | 0.77% (0.00772) | 81.00th | v3 (v2023.03.01) |
| Mar 11, 2024 | 1.08% (0.01083) | 83.95th | v3 (v2023.03.01) |
| Nov 8, 2023 | 1.35% (0.01352) | 84.63th | v3 (v2023.03.01) |
| Aug 14, 2023 | 0.96% (0.00957) | 81.27th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.32% (0.01319) | 83.86th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.11% (0.01108) | 55.18th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.11% (0.01108) | 53.57th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.11% (0.01108) | 51.54th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.11% (0.01108) | 29.61th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.45% (0.01454) | 32.67th | v1 |
| Jan 6, 2022 | 1.45% (0.01454) | 31.96th | v1 |
| Sep 1, 2021 | 1.45% (0.01454) | 71.88th | v1 |
| Apr 14, 2021 | 1.45% (0.01454) | 0.00th | v1 |
References (10)
- http://lists.opensuse.org/opensuse-security-announce/2019-02/msg00018.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.securityfocus.com/bid/106645 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHBA-2019:0327 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0275 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2018-20615 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1663060 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2018-20615
- https://usn.ubuntu.com/3858-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2018-20615
- https://www.mail-archive.com/haproxy%40formilux.org/msg32304.html mailing-listx_refsource_MLIST
| Link | Providers | Tags |
|---|---|---|
| http://lists.opensuse.org/opensuse-security-announce/2019-02/msg00018.html | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| http://www.securityfocus.com/bid/106645 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| https://access.redhat.com/errata/RHBA-2019:0327 | vendor-advisoryx_refsource_REDHATThird Party Advisory | |
| https://access.redhat.com/errata/RHSA-2019:0275 | vendor-advisoryx_refsource_REDHATThird Party Advisory | |
| https://access.redhat.com/security/cve/CVE-2018-20615 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1663060 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2018-20615 | ||
| https://usn.ubuntu.com/3858-1/ | vendor-advisoryx_refsource_UBUNTUThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2018-20615 | ||
| https://www.mail-archive.com/haproxy%40formilux.org/msg32304.html | mailing-listx_refsource_MLIST |
Change history (0)
No recorded changes yet.