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CVE-2021-42575

30
FAUCET Score

CVE-2021-42575 describes a critical vulnerability in the OWASP Java HTML Sanitizer (versions prior to 20211018.1) and related Oracle products, where it fails to properly enforce security policies for SELECT, STYLE, and OPTION HTML elements. This flaw carries a CVSS score of 9.8 (Critical), indicating it can be exploited remotely without user interaction, leading to complete compromise of confidentiality, integrity, and availability. While the vulnerability is severe, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 20211018.2CPE matchmatch criteria
cpe:2.3:a:owasp:java_html_sanitizer:*:*:*:*:*:*:*:*
12.2.1.3.0CPE matchmatch criteria
cpe:2.3:a:oracle:middleware_common_libraries_and_tools:12.2.1.3.0:*:*:*:*:*:*:*
12.2.1.4.0CPE matchmatch criteria
cpe:2.3:a:oracle:middleware_common_libraries_and_tools:12.2.1.4.0:*:*:*:*:*:*:*
>= 17.7, <= 17.12CPE matchmatch criteria
cpe:2.3:a:oracle:primavera_unifier:*:*:*:*:*:*:*:*
18.8CPE matchmatch criteria
cpe:2.3:a:oracle:primavera_unifier:18.8:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.84%
Probability of exploitation in next 30 days
EPSS Percentile
85.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0284 is in the 76th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (7)

mavenpatch availablevia ghsa
Product: com.googlecode.owasp-java-html-sanitizer:owasp-java-html-sanitizerFixed in: 20211018.1
oraclepatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Single Sign-On 7.6 for RHEL 8Fixed in: rh-sso7-keycloak-0:18.0.3-1.redhat_00001.1.el8sso
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Single Sign-On 7.6 for RHEL 9Fixed in: rh-sso7-0:1-5.el9sso
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Single Sign-On 7.6 for RHEL 9Fixed in: rh-sso7-keycloak-0:18.0.3-1.redhat_00001.1.el9sso
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Single Sign-On 7.6 for RHEL 7Fixed in: rh-sso7-keycloak-0:18.0.3-1.redhat_00001.1.el7sso
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Single Sign-On 7.6.1
View patch

Vendor Advisories (2)

mavenGHSA-3w73-fmf3-hg5ccritical

Policies not properly enforced in OWASP Java HTML Sanitizer

Oct 19, 2021
redhatCVE-2021-42575Moderate

owasp-java-html-sanitizer: improper policies enforcement may lead to remote code execution

Oct 18, 2021

References

docs.google.com / document/d/11SoX296sMS0XoQiQbpxc5pNxSdbJKDJkm5BDv0zrX50
ExploitThird Party Advisory
oracle.com / security-alerts/cpujan2022.html
PatchThird Party Advisory
oracle.com / security-alerts/cpujul2022.html
PatchThird Party Advisory