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CVE-2020-27813

24
FAUCET Score

CVE-2020-27813 describes an integer overflow vulnerability in the handling of WebSocket frame lengths, primarily affecting Debian Linux and Gorilla Toolkit's WebSocket implementation. This flaw allows an unauthenticated attacker to trigger a denial of service (DoS) by sending specially crafted WebSocket frames to an affected HTTP server. Rated 7.5 HIGH on the CVSS scale, the vulnerability is easily exploitable over the network with no user interaction, leading to high availability impact. Currently, there is no evidence of active exploitation, nor are there public exploit codes available in Metasploit, Nuclei, or ExploitDB, and it has garnered minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.4.1CPE matchmatch criteria
cpe:2.3:a:gorillatoolkit:websocket:*:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/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
3.1

Exploit Intelligence

EPSS Score
2.12%
Probability of exploitation in next 30 days
EPSS Percentile
79.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0212 is in the 64th 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 (30)

gopatch availablevia ghsa
Product: github.com/gorilla/websocketFixed in: 1.4.1
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: atomic-openshift-cluster-autoscaler-0:3.11.404-1.git.0.2c258fe.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 4.6Fixed in: openshift4/compliance-rhel8-operator:v4.6.0-97
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 4.6Fixed in: openshift4/compliance-rhel8-operator-metadata:v4.6.0.97-1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 4.7Fixed in: openshift4/cnf-tests-rhel8:v4.7.0-34
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 4.7Fixed in: openshift4/dpdk-base-rhel8:v4.7.0-6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 4.7Fixed in: openshift4/performance-addon-operator-bundle-registry-container-rhel8:v4.7.0-612
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 4.7Fixed in: openshift4/performance-addon-rhel8-operator:v4.7.0-30
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 4.7Fixed in: openshift4/ose-console:v4.7.0-202102130115.p0
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 4.7Fixed in: openshift4/file-integrity-rhel8-operator:v4.7.0-9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 4.7Fixed in: openshift4/ose-hyperkube:v4.7.0-202105160013.p0
View patch
redhatpatch availablevia redhat_api
Product: RHEL-8-CNV-2.5Fixed in: container-native-virtualization/vm-import-controller-rhel8:v2.5.3-4
View patch
redhatpatch availablevia redhat_api
Product: RHEL-8-CNV-4.8Fixed in: container-native-virtualization/vm-import-operator-rhel8:v4.8.0-18
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 4.7Fixed in: openshift4/performance-addon-operator-must-gather-rhel8:v4.7.0-72
View patch
redhatvendor investigatingvia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: openshift4/ose-etcd
redhatno patchvia redhat_api
Product: Red Hat OpenShift Virtualization 2Fixed in: vm-import-operator
redhatno patchvia redhat_api
Product: Red Hat OpenShift Virtualization 2Fixed in: hyperconverged-cluster-operator
redhatno patchvia redhat_api
Product: Red Hat OpenShift Virtualization 2Fixed in: kubevirt-template-validator
redhatno patchvia redhat_api
Product: Red Hat OpenShift Virtualization 2Fixed in: virt-controller
redhatno patchvia redhat_api
Product: Red Hat OpenShift Virtualization 2Fixed in: virt-handler
redhatno patchvia redhat_api
Product: Red Hat OpenShift Virtualization 2Fixed in: virt-launcher
redhatno patchvia redhat_api
Product: Red Hat OpenShift Virtualization 2Fixed in: virt-operator
redhatno patchvia redhat_api
Product: Red Hat OpenShift Virtualization 2Fixed in: vm-import-controller
redhatend of lifevia redhat_api
Product: Red Hat 3scale API Management Platform 2Fixed in: 3scale-operator-container
redhatend of lifevia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: atomic-openshift
redhatend of lifevia redhat_api
Product: Red Hat 3scale API Management Platform 2Fixed in: 3scale-apicast-operator-container
redhatend of lifevia redhat_api
Product: Red Hat OpenShift Container Platform Assisted Installer 1Fixed in: rhai-tech-preview/assisted-installer-agent-rhel8
redhatend of lifevia redhat_api
Product: Red Hat OpenShift Container Platform Assisted Installer 1Fixed in: rhai-tech-preview/assisted-installer-reporter-rhel8
redhatend of lifevia redhat_api
Product: Red Hat OpenShift Container Platform Assisted Installer 1Fixed in: rhai-tech-preview/assisted-installer-rhel8
redhatend of lifevia redhat_api
Product: OpenShift Service Mesh 1Fixed in: servicemesh-grafana

Vendor Advisories (2)

goGHSA-3xh2-74w9-5vxmhigh

Integer overflow in github.com/gorilla/websocket

May 18, 2021
redhatCVE-2020-27813Moderate

golang-github-gorilla-websocket: integer overflow leads to denial of service

Aug 25, 2019

References

bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party Advisory
github.com / gorilla/websocket/security/advisories/GHSA-jf24-p9p9-4rjh
Third Party Advisory
lists.debian.org / debian-lts-announce/2021/01/msg00008.html
Mailing ListThird Party Advisory
lists.debian.org / debian-lts-announce/2023/05/msg00012.html