CVE-2021-35043

OWASP AntiSamy before 1.6.4 allows XSS via HTML attributes when using the HTML output serializer (XHTML is not affected). This was demonstrated by a javascript: URL with &#00058 as the replacement for the : character.

Published: 2021-07-19 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-35043 is rated Moderate Risk (50.3/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.51%). EPSS rose +1.04% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-35043

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.47% 1.51% +1.04%
2 2026-04-29 0.36% 0.47% +0.11%
3 2025-11-21 — 0.36% —

Full EPSS history (20 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-35043

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.1 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.7 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2021-35043

GitHub Security Advisory for CVE-2021-35043

GHSA-9c8w-jrw3-q2c3 · Severity: medium · Ecosystem: maven — Cross-site Scripting in OWASP AntiSamy

OS Trackers for CVE-2021-35043

vendor priority summary link
debian not yet assigned CVE-2021-35043 not yet assigned priority: Debian including 1 source packages (libowasp-antisamy-java), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 3, open 2. https://security-tracker.debian.org/tracker/CVE-2021-35043
redhat high — https://access.redhat.com/security/cve/CVE-2021-35043
ubuntu medium CVE-2021-35043 medium priority: Ubuntu including 1 source packages (libowasp-antisamy-java), 13 status rows across 13 suites (bionic, focal, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, upstream, xenial): needs-triage 7, ignored 6. https://ubuntu.com/security/CVE-2021-35043

Affected software / configurations for CVE-2021-35043

Vendor Product Version Raw CPE
antisamy_project antisamy < 1.6.4 cpe:2.3:a:antisamy_project:antisamy:*:*:*:*:*:*:*:*
oracle retail_back_office 14.0 cpe:2.3:a:oracle:retail_back_office:14.0:*:*:*:*:*:*:*
oracle retail_back_office 14.1 cpe:2.3:a:oracle:retail_back_office:14.1:*:*:*:*:*:*:*
oracle retail_central_office 14.0 cpe:2.3:a:oracle:retail_central_office:14.0:*:*:*:*:*:*:*
oracle retail_central_office 14.1 cpe:2.3:a:oracle:retail_central_office:14.1:*:*:*:*:*:*:*
oracle retail_returns_management 14.0 cpe:2.3:a:oracle:retail_returns_management:14.0:*:*:*:*:*:*:*
oracle retail_returns_management 14.1 cpe:2.3:a:oracle:retail_returns_management:14.1:*:*:*:*:*:*:*
oracle banking_enterprise_default_management 2.6.2 cpe:2.3:a:oracle:banking_enterprise_default_management:2.6.2:*:*:*:*:*:*:*
oracle banking_enterprise_default_management 2.7.0 cpe:2.3:a:oracle:banking_enterprise_default_management:2.7.0:*:*:*:*:*:*:*
oracle banking_enterprise_default_management 2.7.1 cpe:2.3:a:oracle:banking_enterprise_default_management:2.7.1:*:*:*:*:*:*:*
oracle banking_enterprise_default_management 2.10.0 cpe:2.3:a:oracle:banking_enterprise_default_management:2.10.0:*:*:*:*:*:*:*
oracle banking_enterprise_default_management 2.12.0 cpe:2.3:a:oracle:banking_enterprise_default_management:2.12.0:*:*:*:*:*:*:*
oracle banking_enterprise_default_managment >= 2.3.0, <= 2.4.0 cpe:2.3:a:oracle:banking_enterprise_default_managment:*:*:*:*:*:*:*:*
oracle banking_party_management 2.7.0 cpe:2.3:a:oracle:banking_party_management:2.7.0:*:*:*:*:*:*:*
oracle banking_platform >= 2.3.0, <= 2.4.1 cpe:2.3:a:oracle:banking_platform:*:*:*:*:*:*:*:*
oracle banking_platform 2.6.2 cpe:2.3:a:oracle:banking_platform:2.6.2:*:*:*:*:*:*:*
oracle banking_platform 2.7.0 cpe:2.3:a:oracle:banking_platform:2.7.0:*:*:*:*:*:*:*
oracle banking_platform 2.7.1 cpe:2.3:a:oracle:banking_platform:2.7.1:*:*:*:*:*:*:*
oracle insurance_policy_administration 11.0.2 cpe:2.3:a:oracle:insurance_policy_administration:11.0.2:*:*:*:*:*:*:*
oracle insurance_policy_administration 11.1.0 cpe:2.3:a:oracle:insurance_policy_administration:11.1.0:*:*:*:*:*:*:*
oracle insurance_policy_administration 11.2.8 cpe:2.3:a:oracle:insurance_policy_administration:11.2.8:*:*:*:*:*:*:*
oracle insurance_policy_administration 11.3.0 cpe:2.3:a:oracle:insurance_policy_administration:11.3.0:*:*:*:*:*:*:*
oracle insurance_policy_administration 11.3.1 cpe:2.3:a:oracle:insurance_policy_administration:11.3.1:*:*:*:*:*:*:*
oracle middleware_common_libraries_and_tools 12.2.1.3.0 cpe:2.3:a:oracle:middleware_common_libraries_and_tools:12.2.1.3.0:*:*:*:*:*:*:*
oracle middleware_common_libraries_and_tools 12.2.1.4.0 cpe:2.3:a:oracle:middleware_common_libraries_and_tools:12.2.1.4.0:*:*:*:*:*:*:*
netapp active_iq_unified_manager — cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:linux:*:*
netapp active_iq_unified_manager — cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*
netapp active_iq_unified_manager — cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:windows:*:*

References for CVE-2021-35043

cvelogic Threat Intelligence