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CVE-2021-20323

52
FAUCET Score

CVE-2021-20323 is a reflected Cross-Site Scripting (XSS) vulnerability affecting Red Hat Keycloak versions 10.0.0 through 18.0.0. With a CVSS score of 6.1 (Medium), this vulnerability can be exploited remotely with low attack complexity, requiring user interaction to achieve partial confidentiality and integrity impact. While there is no evidence of active exploitation (KEV: No), public exploit templates exist for Nuclei, and the vulnerability has a high EPSS score indicating a higher-than-average probability of exploitation. Despite this, there is no community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 17.0.0CPE matchmatch criteria
cpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
37.25%
Probability of exploitation in next 30 days
EPSS Percentile
98.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Nuclei: CVE-2021-20323 · Dec 7, 2022
This CVE's current EPSS score of 0.3725 is in the 99th percentile among its peer group of 26,234 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 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 (2)

mavenpatch availablevia ghsa
Product: org.keycloak:keycloak-coreFixed in: 17.0.0
redhatpatch availablevia redhat_api
Product: RHSSO 7.5.1
View patch

Vendor Advisories (2)

mavenGHSA-xpgc-j48j-jwv9medium

Cross-site Scripting in Keycloak

Mar 26, 2022
redhatCVE-2021-20323Moderate

keycloak-services: POST based reflected Cross Site Scripting vulnerability

Oct 14, 2021

References

bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party Advisory