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CVE-2021-27292

24
FAUCET Score

CVE-2021-27292 is a denial-of-service vulnerability affecting ua-parser-js versions 0.7.14 through 0.7.23. It stems from a regular expression susceptible to ReDoS, allowing an attacker to send a crafted User-Agent header that causes the library to consume excessive processing time. With a CVSS score of 7.5 (HIGH), this vulnerability is easily exploitable over the network with low complexity, leading to a high availability impact. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 0.7.14, < 0.7.24CPE matchmatch criteria
cpe:2.3:a:ua-parser-js_project:ua-parser-js:*:*:*:*:*:node.js:*:*

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
3.37%
Probability of exploitation in next 30 days
EPSS Percentile
87.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0337 is in the 78th percentile among its peer group of 51,553 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 (21)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: ua-parser-jsFixed in: 0.7.24
redhatpatch availablevia redhat_api
Product: OpenShift Logging 5.1Fixed in: openshift-logging/kibana6-rhel8:v6.8.1-108
View patch
redhatpatch availablevia redhat_api
Product: OpenShift Logging 5.2Fixed in: openshift-logging/kibana6-rhel8:v6.8.1-110
View patch
redhatpatch availablevia redhat_api
Product: OpenShift Logging 5.3Fixed in: openshift-logging/kibana6-rhel8:v6.8.1-109
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 4.8Fixed in: openshift4/ose-console:v4.8.0-202107010336.p0.git.188a490.assembly.stream
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Jaeger 1.24Fixed in: distributed-tracing/jaeger-all-in-one-rhel8:1.24.0-8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Jaeger 1.24Fixed in: distributed-tracing/jaeger-collector-rhel8:1.24.0-8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Jaeger 1.24Fixed in: distributed-tracing/jaeger-es-index-cleaner-rhel8:1.24.0-10
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Jaeger 1.24Fixed in: distributed-tracing/jaeger-ingester-rhel8:1.24.0-8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Jaeger 1.24Fixed in: distributed-tracing/jaeger-query-rhel8:1.24.0-9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Jaeger 1.24Fixed in: distributed-tracing/jaeger-rhel8-operator:1.24.0-16
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Jaeger 1.24Fixed in: distributed-tracing/jaeger-es-rollover-rhel8:1.24.0-14
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Jaeger 1.24Fixed in: distributed-tracing/jaeger-agent-rhel8:1.24.0-9
View patch
redhatvendor investigatingvia redhat_api
Product: Red Hat OpenShift Container Platform 3.11Fixed in: kibana
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-logging-kibana6
redhatno patchvia redhat_api
Product: OpenShift Service Mesh 2.0Fixed in: servicemesh-grafana
redhatno patchvia redhat_api
Product: OpenShift Service Mesh 2.0Fixed in: servicemesh-prometheus
redhatno patchvia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: nodejs-ua-parser-js
redhatend of lifevia redhat_api
Product: Red Hat Storage 3Fixed in: grafana

Vendor Advisories (2)

npmGHSA-78cj-fxph-m83phigh

Regular Expression Denial of Service (ReDoS) in ua-parser-js

May 6, 2021
redhatCVE-2021-27292Moderate

nodejs-ua-parser-js: ReDoS via malicious User-Agent header

Feb 11, 2021

References

gist.github.com / b-c-ds/6941d80d6b4e694df4bc269493b7be76
ExploitThird Party Advisory
github.com / faisalman/ua-parser-js/commit/809439e20e273ce0d25c1d04e111dcf6011eb566
PatchThird Party Advisory
github.com / pygments/pygments/commit/2e7e8c4a7b318f4032493773732754e418279a14
PatchThird Party Advisory