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CVE-2021-4231

21
FAUCET Score

CVE-2021-4231 is a cross-site scripting (XSS) vulnerability affecting Angular versions up to 11.0.4 and 11.1.0-next.2, stemming from improper handling of comments. This medium-severity vulnerability (CVSS 5.4) can be exploited remotely, potentially requiring prior authentication, and allows for limited impact on confidentiality and integrity. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
11.1.0CPE matchmatch criteria
cpe:2.3:a:angular:angular:11.1.0:next0:*:*:*:*:*:*
11.1.0CPE matchmatch criteria
cpe:2.3:a:angular:angular:11.1.0:next1:*:*:*:*:*:*
11.1.0CPE matchmatch criteria
cpe:2.3:a:angular:angular:11.1.0:next2:*:*:*:*:*:*
< 11.0.5CPE matchmatch criteria
cpe:2.3:a:angularjs:angularjs:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

3.5LOW

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.1
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.12%
Probability of exploitation in next 30 days
EPSS Percentile
62.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0112 is in the 94th percentile among its peer group of 15,239 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 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 (20)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: @angular/coreFixed in: 11.0.5
npmpatch availablevia ghsa
Product: @angular/coreFixed in: 11.1.0-next.3
npmpatch availablevia ghsa
Product: @angular/coreFixed in: 10.2.5
redhatpatch availablevia redhat_api
Product: Red Hat Ceph Storage 6.1Fixed in: ceph-2:17.2.6-70.el9cp
View patch
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: firefox:flatpak/firefox
redhatvendor investigatingvia redhat_api
Product: .NET Core 3.1 on Red Hat Enterprise LinuxFixed in: rh-dotnet31-dotnet
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: thunderbird
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: thunderbird:flatpak/thunderbird
redhatvendor investigatingvia redhat_api
Product: Red Hat Fuse 7Fixed in: io.apicurio-apicurito
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: dotnet3.1
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: firefox
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: mozjs60
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: thunderbird:flatpak/thunderbird
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: firefox
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: firefox:flatpak/firefox
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: gjs
redhatno patchvia redhat_api
Product: Red Hat Ceph Storage 5Fixed in: ceph
redhatno patchvia redhat_api
Product: Red Hat Ceph Storage 4Fixed in: ceph
redhatno patchvia redhat_api
Product: Red Hat Openshift Data Foundation 4Fixed in: ceph

Vendor Advisories (2)

npmGHSA-c75v-2vq8-878fmedium

Angular vulnerable to Cross-site Scripting

May 27, 2022
redhatCVE-2021-4231Low

angular: XSS vulnerability

Dec 15, 2020

References

github.com / angular/angular/commit/ba8da742e3b243e8f43d4c63aa842b44e14f2b09
PatchThird Party Advisory
github.com / angular/angular/issues/40136
Third Party Advisory
security.snyk.io / vuln/SNYK-JS-ANGULARCORE-1070902
Third Party Advisory
vuldb.com
Third Party Advisory