No exploitation reportedFix available

CVE-2021-27292

Q: Is CVE-2021-27292 actively exploited?

Active exploitation of CVE-2021-27292 has not been confirmed. Its EPSS score was 3.4% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-27292?

CVE-2021-27292 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2021-03-17
Fixed in0.7.24

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

ua-parser-js >= 0.7.14, fixed in 0.7.24, uses a regular expression which is vulnerable to denial of service. If an attacker sends a malicious User-Agent header, ua-parser-js will get stuck processing it for an extended period of time.

Timeline

dates in UTC

2021-03-1713:15CVE publishedNVD

Versions per branch

NVD · OSV

Ua-parser-js project ua-parser-js

Branch	Affected	Fixed in	Source
0.7	≥ 0.7.14, < 0.7.24	0.7.24	NVD · OSV

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

node-ua-parser-jsUbuntu:22.04:LTSall versions · no fixed version listed
node-ua-parser-jsUbuntu:20.04:LTSall versions · no fixed version listed
node-ua-parser-jsUbuntu:18.04:LTSall versions · no fixed version listed
node-ua-parser-jsDebian:14all versions · fixed in 0.7.24+ds-1
node-ua-parser-jsDebian:13all versions · fixed in 0.7.24+ds-1
node-ua-parser-jsDebian:12all versions · fixed in 0.7.24+ds-1
ua-parser-jsTuxCare:npmfrom 0.7.21-tuxcare.0 · fixed in 0.7.21-tuxcare.1
ua-parser-jsTuxCare:npmfrom 0.7.22-tuxcare.0 · fixed in 0.7.22-tuxcare.1

Vendor advisories

CVE-2021-27292 Red Hat Product Security36 products fixed · 15 known affected
nodejs-ua-parser-js: ReDoS via malicious User-Agent header
servicemesh-grafana as a component of OpenShift Service Mesh 2.0 · servicemesh-grafana-prometheus as a component of OpenShift Service Mesh 2.0 · servicemesh-grafana.src as a component of OpenShift Service Mesh 2.0 · +12 more
RHSA-2022:0230 Red Hat Product Security3 products fixed
Red Hat Security Advisory: Red Hat OpenShift Enterprise Logging bug fix and security update (5.2.6)
RHSA-2022:0227 Red Hat Product Security3 products fixed
Red Hat Security Advisory: Red Hat OpenShift Enterprise Logging bug fix and security update (5.3.3)
RHSA-2022:0226 Red Hat Product Security3 products fixed
Red Hat Security Advisory: Red Hat OpenShift Enterprise Logging bug fix and security update (5.1.7)
RHSA-2021:3024 Red Hat Product Security24 products fixed
Red Hat Security Advisory: Red Hat OpenShift Jaeger 1.24.0 Operator/Operand Containers security update
RHSA-2021:2438 Red Hat Product Security3 products fixed
Red Hat Security Advisory: OpenShift Container Platform 4.8.2 bug fix and security update

Full record on NVD

Fix

Update Ua-parser-js project ua-parser-js to 0.7.24
Vendor fix Red Hat Product Security RHSA-2022:0230 · 3 productsFor OpenShift Container Platform 4.8 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.openshift.com/container-platform/4.8/release_notes/ocp-4-8-release-notes.…
Vendor fix Red Hat Product Security RHSA-2022:0227 · 3 productsFor OpenShift Container Platform 4.9 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.openshift.com/container-platform/4.9/release_notes/ocp-4-9-release-notes.…
Vendor fix Red Hat Product Security RHSA-2021:3024 · 24 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://docs.openshift.com/container-platform/4.8/jaeger/jaeger_install/rhbjaeger-updating.html
Vendor fix Red Hat Product Security RHSA-2021:2438 · 3 productsFor OpenShift Container Platform 4.8 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.8/release_notes/ocp-4-8-r…
No fix available, says the vendor Red Hat Product Security CVE-2021-27292 · 4 productsFix deferred
No fix available, says the vendor Red Hat Product Security CVE-2021-27292 · 6 productsAffected

Advisories and patches

github.comPatch
github.comPatch

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof of concept: PoC-in-GitHubno public repository identifiedread 2026-11-10
Metasploit modules: none listed

Sources

NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
FIRST EPSSEPSS score3.4 %2026-11-09
OSVaffected packages—
GitHub AdvisoriesadvisoryHIGH2021-03-22

Identifiers

EUVD-2021-0991same flawENISA EUVD · LicenseRef-ENISA-legal-notice
GHSA-78cj-fxph-m83psame flawGitHub Advisory Database · CC-BY-4.0

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2021-03-17
Last Modified: 2026-06-17
NVD status: Modified
GitHub Advisory: GHSA-78cj-fxph-m83p

Frequently asked questions

What is CVE-2021-27292?

Is CVE-2021-27292 actively exploited?

Active exploitation of CVE-2021-27292 has not been confirmed. Its EPSS score was 3.4% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-27292?

CVE-2021-27292 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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