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CVE-2021-3803

26
FAUCET Score

CVE-2021-3803 describes an Inefficient Regular Expression Complexity vulnerability in nth-check, affecting various Debian Linux distributions and the nth-check project itself. With a CVSS score of 7.5 (HIGH), this vulnerability is remotely exploitable with low attack complexity, potentially leading to a denial of service. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.0.1CPE matchmatch criteria
cpe:2.3:a:nth-check_project:nth-check:*:*:*:*:*:*:*:*
10.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

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
2.17%
Probability of exploitation in next 30 days
EPSS Percentile
80.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0216 is in the 65th 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 (13)

bitdefenderpatch availablevia llm_extracted
Fixed in: ['8.2.12', '9.0.6', '9.1.1']
View patch
github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: nth-checkFixed in: 2.0.1
redhatvendor investigatingvia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: rhacm2/mcm-topology-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-ui-rhel8
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
redhatend of lifevia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: openshift4/ose-prometheus-rhel9
redhatend of lifevia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: openshift4/ose-thanos-rhel8
redhatend of lifevia redhat_api
Product: Red Hat Virtualization 4Fixed in: ovirt-engine-ui-extensions
redhatend of lifevia redhat_api
Product: Red Hat Virtualization 4Fixed in: ovirt-web-ui
redhatend of lifevia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: openshift4/ose-grafana

Vendor Advisories (3)

bitdefenderllm-bitdefender-2250a01bd7a7224eHIGH

August 2023 Third Party Package Updates in Splunk Enterprise

Aug 30, 2023
npmGHSA-rp65-9cf3-cjxrhigh

Inefficient Regular Expression Complexity in nth-check

Sep 20, 2021
redhatCVE-2021-3803Moderate

nodejs-nth-check: inefficient regular expression complexity

Sep 13, 2021

References

github.com / fb55/nth-check/commit/9894c1d2010870c351f66c6f6efcf656e26bb726
PatchThird Party Advisory
huntr.dev / bounties/8cf8cc06-d2cf-4b4e-b42c-99fafb0b04d0
ExploitIssue TrackingPatchThird Party Advisory
lists.debian.org / debian-lts-announce/2023/05/msg00023.html
Mailing ListThird Party Advisory