Is CVE-2021-24436 in the CISA KEV catalog?

No. CVE-2021-24436 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-24436?

CVE-2021-24436 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2021-24436?

CVE-2021-24436 has an EPSS score of 1.91% (77th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-24436?

Upgrade w3 total cache to 2.1.4 or later.

CVE & CISA-KEV Catalog

CVE-2021-24436

MEDIUMEPSS 77th pctl

6.1

CVSS v3

NVD

Description

The W3 Total Cache WordPress plugin before 2.1.4 was vulnerable to a reflected Cross-Site Scripting (XSS) security vulnerability within the "extension" parameter in the Extensions dashboard, which is output in an attribute without being escaped first. This could allow an attacker, who can convince an authenticated admin into clicking a link, to run malicious JavaScript within the user's web browser, which could lead to full site compromise.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

w3 total cacheNVD

Affected:< 2.1.4Fixed in:2.1.4CVE-2021-24436derived 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 RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

1.91%probability of exploitation in 30 days

77thpercentile

Elevated risk: more likely to be exploited than 77% of all known CVEs.

References

Exploit1

wpscan.com

Related Vulnerabilities

Other CWE-79 (Cross-Site Scripting (XSS)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-11022	Medium	6.9	99%	-	Fix
CVE-2019-3929	Critical	9.8	99%	KEV	Fix
CVE-2020-9496	Medium	6.1	99%	-	-
CVE-2023-28341	Medium	6.1	99%	-	Fix
CVE-2018-12998	Medium	6.1	98%	-	-
CVE-2025-4123	High	7.6	98%	-	Fix

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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.