How severe is CVE-2021-35043?

CVE-2021-35043 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-35043 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-35043?

CVE-2021-35043 primarily affects Antisamy Project Antisamy. In total, 28 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-35043?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-35043 published?

CVE-2021-35043 was published on 2021-07-19 and last updated on 2026-06-17.

CVE-2021-35043

CVE-2021-35043 is a medium-severity vulnerability in Antisamy Project Antisamy with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 2% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Antisamy Project Antisamy
Published: 2021-07-19
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2021-35043?: CVE-2021-35043 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-35043 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-35043?: CVE-2021-35043 primarily affects Antisamy Project Antisamy. In total, 28 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-35043?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-35043 published?: CVE-2021-35043 was published on 2021-07-19 and last updated on 2026-06-17.

References

Affected products (28)

cpe:2.3:a:antisamy_project:antisamy:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:retail_back_office:14.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:retail_back_office:14.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:retail_central_office:14.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:retail_central_office:14.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:retail_returns_management:14.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:retail_returns_management:14.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_enterprise_default_management:2.6.2:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_enterprise_default_management:2.7.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_enterprise_default_management:2.7.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_enterprise_default_management:2.10.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_enterprise_default_management:2.12.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_enterprise_default_managment:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_party_management:2.7.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_platform:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_platform:2.6.2:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_platform:2.7.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_platform:2.7.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:insurance_policy_administration:11.0.2:*:*:*:*:*:*:*
cpe:2.3:a:oracle:insurance_policy_administration:11.1.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:insurance_policy_administration:11.2.8:*:*:*:*:*:*:*
cpe:2.3:a:oracle:insurance_policy_administration:11.3.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:insurance_policy_administration:11.3.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:middleware_common_libraries_and_tools:12.2.1.3.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:middleware_common_libraries_and_tools:12.2.1.4.0:*:*:*:*:*:*:*
cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:linux:*:*
cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*
cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:windows:*:*

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