Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2018-20103

27
FAUCET Score

CVE-2018-20103 is a high-severity vulnerability affecting HAProxy versions through 1.8.14, as well as various Canonical and Red Hat products integrating HAProxy. It involves a crafted DNS packet that can cause infinite recursion or stack exhaustion due to a self-referencing or long chain of compressed pointers in dns.c. With a CVSS score of 7.5, this network-exploitable vulnerability requires no user interaction and can lead to a complete denial of service. There is currently no known active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.8.14CPE matchmatch criteria
cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*
16.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
18.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
18.10CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*
3.11CPE matchmatch criteria
cpe:2.3:a:redhat:openshift_container_platform:3.11:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
6.59%
Probability of exploitation in next 30 days
EPSS Percentile
93.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0659 is in the 88th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (26)

redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: atomic-enterprise-service-catalog-1:3.11.82-1.git.1673.133961e.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: atomic-openshift-0:3.11.82-1.git.0.08bc31b.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: atomic-openshift-cluster-autoscaler-0:3.11.82-1.git.0.efb6af0.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: atomic-openshift-descheduler-0:3.11.82-1.git.300.89765c9.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: atomic-openshift-dockerregistry-0:3.11.82-1.git.452.0ce6383.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: atomic-openshift-metrics-server-0:3.11.82-1.git.52.2fdca3f.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: atomic-openshift-node-problem-detector-0:3.11.82-1.git.254.a448936.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: atomic-openshift-service-idler-0:3.11.82-1.git.14.e353758.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: atomic-openshift-web-console-0:3.11.82-1.git.355.5e8b1d9.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: golang-github-openshift-oauth-proxy-0:3.11.82-1.git.425.7cac034.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: golang-github-prometheus-alertmanager-0:3.11.82-1.git.0.3bf41ce.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: golang-github-prometheus-node_exporter-0:3.11.82-1.git.1063.48444e8.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: golang-github-prometheus-prometheus-0:3.11.82-1.git.5027.9d24833.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: haproxy-0:1.8.17-3.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: jenkins-0:2.150.2.1549032159-1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: jenkins-2-plugins-0:3.11.1549642489-1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: openshift-ansible-0:3.11.82-3.git.0.9718d0a.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: openshift-enterprise-autoheal-0:3.11.82-1.git.219.0b5aff4.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: openshift-enterprise-cluster-capacity-0:3.11.82-1.git.380.cf11c51.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7Fixed in: rh-haproxy18-haproxy-0:1.8.17-1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUSFixed in: rh-haproxy18-haproxy-0:1.8.17-1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUSFixed in: rh-haproxy18-haproxy-0:1.8.17-1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUSFixed in: rh-haproxy18-haproxy-0:1.8.17-1.el7
View patch
redhatno patchvia redhat_api
Product: Red Hat OpenShift Container Platform 3.10Fixed in: haproxy
redhatno patchvia redhat_api
Product: Red Hat OpenShift Container Platform 3.7Fixed in: haproxy
redhatno patchvia redhat_api
Product: Red Hat OpenShift Container Platform 3.9Fixed in: haproxy

Vendor Advisories (1)

redhatCVE-2018-20103Important

haproxy: Infinite recursion via crafted packet allows stack exhaustion and denial of service

Dec 12, 2018

References

git.haproxy.org
access.redhat.com / errata/RHBA-2019:0326
Third Party Advisory
access.redhat.com / errata/RHBA-2019:0327
Third Party Advisory
access.redhat.com / errata/RHSA-2019:1436
lists.debian.org / debian-lts-announce/2022/05/msg00045.html
usn.ubuntu.com / 3858-1
Third Party Advisory
securityfocus.com / bid/106280
Third Party AdvisoryVDB Entry