CVE-2018-20615
An out-of-bounds read issue was discovered in the HTTP/2 protocol decoder in HAProxy 1.8.x and 1...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2018-20615- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-125
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2018-20615- Updated
- 2026-11-02
EUVDEUVD-2018-13166 No score
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.
- Record
EUVD-2018-13166- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-w4g5-v736-j48g
An out-of-bounds read issue was discovered in the HTTP/2 protocol decoder in HAProxy 1.8.x and 1...
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.
- Record
GHSA-w4g5-v736-j48g- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-125
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2018-20615- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVDEBIAN-CVE-2018-20615
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.
- Record
DEBIAN-CVE-2018-20615- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
Show 9 moreShow less
OSVRHBA-2019:0326
Red Hat Bug Fix Advisory: OpenShift Container Platform 3.11 bug fix update
- Record
RHBA-2019:0326- CVSS 3.0
- 8.8 High
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVRHSA-2019:0275
Red Hat Security Advisory: rh-haproxy18-haproxy security update
- Record
RHSA-2019:0275- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVRHSA-2019:0547
Red Hat Security Advisory: OpenShift Container Platform 3.9 haproxy security update
- Record
RHSA-2019:0547- CVSS 3.0
- 6.5 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L - Updated
- 2026-11-02
OSVRHSA-2019:0548
Red Hat Security Advisory: OpenShift Container Platform 3.10 haproxy security update
- Record
RHSA-2019:0548- CVSS 3.0
- 5.9 Medium
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2018-20615
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.
- Record
UBUNTU-CVE-2018-20615- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVopenSUSE-SU-2019:0166-1 No score
Security update for haproxy
This update for haproxy version 1.8.17 fixes the following issues:
Security issues fixed:
- CVE-2018-20615: Fixed a denial of service, triggered by mishandling the priority flag on short HEADERS frame in the HTTP/2 decoder (bsc#1121283)
This update was imported from the SUSE:SLE-15:Update update project.
- Record
openSUSE-SU-2019:0166-1- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:10839-1 No score
haproxy-2.4.4+git0.acb1d0bea-1.2 on GA media
These are all security issues fixed in the haproxy-2.4.4+git0.acb1d0bea-1.2 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:10839-1- Updated
- 2026-11-02
OSVSUSE-SU-2019:0232-1 No score
Security update for haproxy
This update for haproxy version 1.8.17 fixes the following issues:
Security issues fixed:
- CVE-2018-20615: Fixed a denial of service, triggered by mishandling the priority flag on short HEADERS frame in the HTTP/2 decoder (bsc#1121283)
- Record
SUSE-SU-2019:0232-1- Updated
- 2026-11-02
OSVUSN-3858-1 No score
haproxy vulnerabilities
It was discovered that HAProxy incorrectly handled certain requests. An attacker could possibly use this to expose sensitive information. (CVE-2018-20102)
It was discovered that HAProxy incorrectly handled certain requests. A attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 18.10. (CVE-2018-20103, CVE-2018-20615)
- Record
USN-3858-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
haproxyDebian:12 |
before 1.8.16-2 | 1.8.16-2 |
haproxyDebian:13 |
before 1.8.16-2 | 1.8.16-2 |
haproxyDebian:14 |
before 1.8.16-2 | 1.8.16-2 |
atomic-enterprise-service-catalogRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 1:3.11.82-1.git.1673.133961e.el7 | 1:3.11.82-1.git.1673.133961e.el7 |
atomic-enterprise-service-catalog-svcatRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 1:3.11.82-1.git.1673.133961e.el7 | 1:3.11.82-1.git.1673.133961e.el7 |
atomic-openshiftRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.0.08bc31b.el7 | 0:3.11.82-1.git.0.08bc31b.el7 |
atomic-openshift-clientsRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.0.08bc31b.el7 | 0:3.11.82-1.git.0.08bc31b.el7 |
atomic-openshift-clients-redistributableRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.0.08bc31b.el7 | 0:3.11.82-1.git.0.08bc31b.el7 |
atomic-openshift-cluster-autoscalerRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.0.efb6af0.el7 | 0:3.11.82-1.git.0.efb6af0.el7 |
atomic-openshift-deschedulerRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.300.89765c9.el7 | 0:3.11.82-1.git.300.89765c9.el7 |
Show 48 moreShow less
| Package | Affected | Fixed |
|---|---|---|
atomic-openshift-docker-excluderRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.0.08bc31b.el7 | 0:3.11.82-1.git.0.08bc31b.el7 |
atomic-openshift-dockerregistryRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.452.0ce6383.el7 | 0:3.11.82-1.git.452.0ce6383.el7 |
atomic-openshift-excluderRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.0.08bc31b.el7 | 0:3.11.82-1.git.0.08bc31b.el7 |
atomic-openshift-hyperkubeRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.0.08bc31b.el7 | 0:3.11.82-1.git.0.08bc31b.el7 |
atomic-openshift-hypershiftRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.0.08bc31b.el7 | 0:3.11.82-1.git.0.08bc31b.el7 |
atomic-openshift-masterRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.0.08bc31b.el7 | 0:3.11.82-1.git.0.08bc31b.el7 |
atomic-openshift-metrics-serverRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.52.2fdca3f.el7 | 0:3.11.82-1.git.52.2fdca3f.el7 |
atomic-openshift-nodeRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.0.08bc31b.el7 | 0:3.11.82-1.git.0.08bc31b.el7 |
atomic-openshift-node-problem-detectorRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.254.a448936.el7 | 0:3.11.82-1.git.254.a448936.el7 |
atomic-openshift-podRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.0.08bc31b.el7 | 0:3.11.82-1.git.0.08bc31b.el7 |
atomic-openshift-sdn-ovsRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.0.08bc31b.el7 | 0:3.11.82-1.git.0.08bc31b.el7 |
atomic-openshift-service-idlerRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.14.e353758.el7 | 0:3.11.82-1.git.14.e353758.el7 |
atomic-openshift-template-service-brokerRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.0.08bc31b.el7 | 0:3.11.82-1.git.0.08bc31b.el7 |
atomic-openshift-testsRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.0.08bc31b.el7 | 0:3.11.82-1.git.0.08bc31b.el7 |
atomic-openshift-web-consoleRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.355.5e8b1d9.el7 | 0:3.11.82-1.git.355.5e8b1d9.el7 |
golang-github-openshift-oauth-proxyRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.425.7cac034.el7 | 0:3.11.82-1.git.425.7cac034.el7 |
golang-github-prometheus-alertmanagerRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.0.3bf41ce.el7 | 0:3.11.82-1.git.0.3bf41ce.el7 |
golang-github-prometheus-node_exporterRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.1063.48444e8.el7 | 0:3.11.82-1.git.1063.48444e8.el7 |
golang-github-prometheus-prometheusRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.5027.9d24833.el7 | 0:3.11.82-1.git.5027.9d24833.el7 |
haproxyRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:1.8.17-3.el7 | 0:1.8.17-3.el7 |
haproxy-debuginfoRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:1.8.17-3.el7 | 0:1.8.17-3.el7 |
haproxy18Red Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:1.8.17-3.el7 | 0:1.8.17-3.el7 |
jenkinsRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:2.150.2.1549032159-1.el7 | 0:2.150.2.1549032159-1.el7 |
jenkins-2-pluginsRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.1549642489-1.el7 | 0:3.11.1549642489-1.el7 |
openshift-ansibleRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-3.git.0.9718d0a.el7 | 0:3.11.82-3.git.0.9718d0a.el7 |
openshift-ansible-docsRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-3.git.0.9718d0a.el7 | 0:3.11.82-3.git.0.9718d0a.el7 |
openshift-ansible-playbooksRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-3.git.0.9718d0a.el7 | 0:3.11.82-3.git.0.9718d0a.el7 |
openshift-ansible-rolesRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-3.git.0.9718d0a.el7 | 0:3.11.82-3.git.0.9718d0a.el7 |
openshift-ansible-testRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-3.git.0.9718d0a.el7 | 0:3.11.82-3.git.0.9718d0a.el7 |
openshift-enterprise-autohealRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.219.0b5aff4.el7 | 0:3.11.82-1.git.219.0b5aff4.el7 |
openshift-enterprise-cluster-capacityRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.380.cf11c51.el7 | 0:3.11.82-1.git.380.cf11c51.el7 |
prometheusRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.5027.9d24833.el7 | 0:3.11.82-1.git.5027.9d24833.el7 |
prometheus-alertmanagerRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.0.3bf41ce.el7 | 0:3.11.82-1.git.0.3bf41ce.el7 |
prometheus-node-exporterRed Hat:openshift:3.11::el7 From an advisory covering 16 CVEs |
before 0:3.11.82-1.git.1063.48444e8.el7 | 0:3.11.82-1.git.1063.48444e8.el7 |
rh-haproxy18-haproxyRed Hat:rhel_software_collections:3::el7 |
before 0:1.8.4-4.el7 | 0:1.8.4-4.el7 |
rh-haproxy18-haproxy-debuginfoRed Hat:rhel_software_collections:3::el7 |
before 0:1.8.4-4.el7 | 0:1.8.4-4.el7 |
rh-haproxy18-haproxy-syspathsRed Hat:rhel_software_collections:3::el7 |
before 0:1.8.4-4.el7 | 0:1.8.4-4.el7 |
haproxyRed Hat:openshift:3.9::el7 From an advisory covering 2 CVEs |
before 0:1.8.17-3.el7 | 0:1.8.17-3.el7 |
haproxy-debuginfoRed Hat:openshift:3.9::el7 From an advisory covering 2 CVEs |
before 0:1.8.17-3.el7 | 0:1.8.17-3.el7 |
haproxy18Red Hat:openshift:3.9::el7 From an advisory covering 2 CVEs |
before 0:1.8.17-3.el7 | 0:1.8.17-3.el7 |
haproxyRed Hat:openshift:3.10::el7 |
before 0:1.8.17-3.el7 | 0:1.8.17-3.el7 |
haproxy-debuginfoRed Hat:openshift:3.10::el7 |
before 0:1.8.17-3.el7 | 0:1.8.17-3.el7 |
haproxy18Red Hat:openshift:3.10::el7 |
before 0:1.8.17-3.el7 | 0:1.8.17-3.el7 |
haproxySUSE:Linux Enterprise High Availability Extension 15 |
before 1.8.17~git0.e89d25b2-3.9.1 | 1.8.17~git0.e89d25b2-3.9.1 |
haproxyUbuntu:18.04:LTS |
before 1.8.8-1ubuntu0.3, plus listed versions 1.7.9-1ubuntu11.7.9-1ubuntu21.8.4-11.8.7-11.8.8-11.8.8-1ubuntu0.11.8.8-1ubuntu0.2 |
1.8.8-1ubuntu0.3 |
haproxyUbuntu:16.04:LTS From an advisory covering 3 CVEs |
before 1.6.3-1ubuntu0.2, plus listed versions 1.5.14-11.5.15-11.6.2-11.6.2-21.6.2-2ubuntu11.6.2-2ubuntu31.6.3-11.6.3-1ubuntu0.1 |
1.6.3-1ubuntu0.2 |
haproxyUbuntu:18.04:LTS From an advisory covering 3 CVEs |
before 1.8.8-1ubuntu0.3, plus listed versions 1.7.9-1ubuntu11.7.9-1ubuntu21.8.4-11.8.7-11.8.8-11.8.8-1ubuntu0.11.8.8-1ubuntu0.2 |
1.8.8-1ubuntu0.3 |
haproxyopenSUSE:Tumbleweed From an advisory covering 9 CVEs |
before 2.4.4+git0.acb1d0bea-1.2 | 2.4.4+git0.acb1d0bea-1.2 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2018-20615 is a high vulnerability (CVSS 7.5) in Haproxy, published December 31, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 4.46%, the 91st percentile. Fixed in haproxy 1.8.16-2.
References
securityfocus.com/bid/106645
access.redhat.com/errata/RHSA-2019:0275
lists.opensuse.org/opensuse-security-announce/2019-02/msg00018.html
usn.ubuntu.com/3858-1
mail-archive.com/haproxy%40formilux.org/msg32304.html
Show 127 moreShow less
nvd.nist.gov/vuln/detail/CVE-2018-20615
github.com/advisories/GHSA-w4g5-v736-j48g
security-tracker.debian.org/tracker/CVE-2018-20615
bugzilla.redhat.com/show_bug.cgi?id=1506736
security.access.redhat.com/data/csaf/v2/advisories/2019/rhba-2019_0326.json
cve.org/CVERecord?id=CVE-2018-20102
jenkins.io/security/advisory/2019-01-08
suse.com/support/update/announcement/2019/suse-su-20190232-1
bugzilla.suse.com/1121283
ubuntu.com/security/CVE-2018-20615