Is CVE-2021-4434 in the CISA KEV catalog?

No. CVE-2021-4434 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-4434?

CVE-2021-4434 has a CVSS v3 base score of 10.0 (CRITICAL).

What is the EPSS score for CVE-2021-4434?

CVE-2021-4434 has an EPSS score of 1.92% (77th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-4434?

Upgrade social warfare to 3.5.3 or later.

CVE & CISA-KEV Catalog

CVE-2021-4434

CRITICALEPSS 77th pctl

10.0

CVSS v3

NVD

Description

The Social Warfare plugin for WordPress is vulnerable to Remote Code Execution in versions up to, and including, 3.5.2 via the 'swp_url' parameter. This allows attackers to execute code on the server.

CWE-94Code Injection

How to fix

Remediation Available

social warfareNVD

Affected:< 3.5.3Fixed in:3.5.3CVE-2021-4434derived 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 InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.92%probability of exploitation in 30 days

77thpercentile

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

References

Exploit1

packetstormsecurity.com

Third-Party Advisory1

wordfence.com

Related Vulnerabilities

Other CWE-94 (Code Injection) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-9841	Critical	9.8	100%	KEV	Fix
CVE-2015-1635	Critical	9.8	100%	KEV	-
CVE-2022-22954	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-22204	Medium	6.8	100%	KEV	Fix
CVE-2025-3248	Critical	9.8	100%	KEV	Fix
CVE-2012-0158	High	8.8	100%	KEV	-

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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 2026-04-08.