Is CVE-2021-4252 in the CISA KEV catalog?

No. CVE-2021-4252 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-4252?

CVE-2021-4252 has a CVSS v3 base score of 3.5 (LOW).

What is the EPSS score for CVE-2021-4252?

CVE-2021-4252 has an EPSS score of 0.46% (37th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-4252?

Upgrade wp-ban to 2021-11-24 or later.

CVE & CISA-KEV Catalog

CVE-2021-4252

LOW

3.5

CVSS v3

NVD

Description

A vulnerability, which was classified as problematic, has been found in WP-Ban. This issue affects the function toggle_checkbox of the file ban-options.php. The manipulation of the argument $_SERVER["HTTP_USER_AGENT"] leads to cross site scripting. The attack may be initiated remotely. The name of the patch is 13e0b1e922f3aaa3f8fcb1dd6d50200dd693fd76. It is recommended to apply a patch to fix this issue. The identifier VDB-216209 was assigned to this vulnerability.

CWE-707

How to fix

Remediation Available

wp-banNVD

Affected:< 2021-11-24Fixed in:2021-11-24CVE-2021-4252derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

0.46%probability of exploitation in 30 days

37thpercentile

Low risk: more likely to be exploited than 37% of all known CVEs.

References

Patch2

Third-Party Advisory1

vuldb.com

Related Vulnerabilities

Other CWE-707 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-10914	High	8.1	97%	-	-
CVE-2024-10915	High	8.1	79%	-	-
CVE-2024-43572	High	7.8	61%	KEV	Fix
CVE-2022-4257	Medium	6.3	44%	-	-
CVE-2025-26633	High	7.0	32%	KEV + Ransom	Fix
CVE-2022-3801	Medium	6.3	30%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.