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CVE-2021-32640

21
FAUCET Score

CVE-2021-32640 is a denial-of-service vulnerability affecting the open-source Node.js WebSocket library 'ws' and related products like NetApp E-Series Performance Analyzer. A specially crafted Sec-Websocket-Protocol header can significantly slow down a vulnerable ws server. Rated Medium (CVSS 5.3), this vulnerability has a network attack vector with low complexity, requiring no user interaction, and can lead to a low impact on availability. While a fix is available in [email protected], there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 5.0.0, < 6.2.2CPE matchmatch criteria
cpe:2.3:a:ws_project:ws:*:*:*:*:*:node.js:*:*
>= 7.0.0, < 7.4.6CPE matchmatch criteria
cpe:2.3:a:ws_project:ws:*:*:*:*:*:node.js:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:netapp:e-series_performance_analyzer:-:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.82%
Probability of exploitation in next 30 days
EPSS Percentile
85.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0282 is in the 79th percentile among its peer group of 23,703 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (24)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: wsFixed in: 7.4.6
npmpatch availablevia ghsa
Product: wsFixed in: 6.2.2
npmpatch availablevia ghsa
Product: wsFixed in: 5.2.3
redhatvendor investigatingvia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: rhacm2/console-ui-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: openshift4/ose-console-rhel9
redhatvendor investigatingvia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: openshift4/ose-grafana
redhatvendor investigatingvia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: openshift4/ose-prometheus-rhel9
redhatvendor investigatingvia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: openshift4/ose-thanos-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: mcm-topology
redhatvendor investigatingvia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: mcm-topology-api
redhatvendor investigatingvia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: rhacm2/application-ui-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: rhacm2/console-api-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: rhacm2/console-header-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: rhacm2/console-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: rhacm2/grc-ui-api-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: rhacm2/grc-ui-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: rhacm2/kui-web-terminal-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: rhacm2/search-api-rhel8
redhatvendor investigatingvia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: rhacm2/search-ui-rhel8
redhatno patchvia redhat_api
Product: OpenShift Service Mesh 2.0Fixed in: servicemesh-prometheus
redhatno patchvia redhat_api
Product: OpenShift Service Mesh 2.0Fixed in: servicemesh-grafana
redhatno patchvia redhat_api
Product: Red Hat Openshift Container Storage 4Fixed in: ocs4/mcg-core-rhel8
redhatno patchvia redhat_api
Product: Red Hat Ansible Automation Platform 1.2Fixed in: ws

Vendor Advisories (2)

npmGHSA-6fc8-4gx4-v693medium

ReDoS in Sec-Websocket-Protocol header

May 28, 2021
redhatCVE-2021-32640Low

nodejs-ws: Specially crafted value of the `Sec-Websocket-Protocol` header can be used to significantly slow down a ws server

May 25, 2021

References

github.com / websockets/ws/commit/00c425ec77993773d823f018f64a5c44e17023ff
PatchThird Party Advisory
github.com / websockets/ws/security/advisories/GHSA-6fc8-4gx4-v693
ExploitMitigationPatchThird Party Advisory
lists.apache.org / thread.html/rdfa7b6253c4d6271e31566ecd5f30b7ce1b8fb2c89d52b8c4e0f4e30%40%3Ccommits.tinkerpop.apache.org%3E
security.netapp.com / advisory/ntap-20210706-0005
Third Party Advisory