Is CVE-2021-20743 in the CISA KEV catalog?

No. CVE-2021-20743 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-20743?

CVE-2021-20743 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2021-20743?

CVE-2021-20743 has an EPSS score of 0.75% (51th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-20743?

Upgrade email newsletters management to 1.0.4 or later.

CVE & CISA-KEV Catalog

CVE-2021-20743

MEDIUM

6.1

CVSS v3

NVD

Description

Cross-site scripting vulnerability in EC-CUBE Email newsletters management plugin (for EC-CUBE 3.0 series) versions prior to version 1.0.4 allows a remote attacker to inject an arbitrary script by leading a user to a specially crafted page and to perform a specific operation.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

email newsletters managementNVD

Affected:< 1.0.4Fixed in:1.0.4CVE-2021-20743derived 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

0.75%probability of exploitation in 30 days

51stpercentile

Moderate risk: more likely to be exploited than 51% of all known CVEs.

References

Third-Party Advisory1

jvn.jp

Product1

ec-cube.net

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.