Is CVE-2021-20453 in the CISA KEV catalog?

No. CVE-2021-20453 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-20453?

CVE-2021-20453 has a CVSS v3 base score of 8.2 (HIGH).

What is the EPSS score for CVE-2021-20453?

CVE-2021-20453 has an EPSS score of 2.56% (83th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-20453?

Upgrade websphere application server to 9.0.5.8 or later.

CVE & CISA-KEV Catalog

CVE-2021-20453

HIGHEPSS 83th pctl

8.2

CVSS v3

NVD

Description

IBM WebSphere Application Server 8.0, 8.5, and 9.0 is vulnerable to a XML External Entity Injection (XXE) attack when processing XML data. A remote attacker could exploit this vulnerability to expose sensitive information or consume memory resources. IBM X-Force ID: 196648.

CWE-611XML External Entity (XXE)

How to fix

Remediation Available

websphere application serverNVD

Affected:>= 9.0.0.0, < 9.0.5.8Fixed in:9.0.5.8CVE-2021-20453derived 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

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

2.56%probability of exploitation in 30 days

83rdpercentile

Elevated risk: more likely to be exploited than 83% of all known CVEs.

References

Patch1

ibm.com

Vendor Advisory1

exchange.xforce.ibmcloud.com

Related Vulnerabilities

Other CWE-611 (XML External Entity (XXE)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-34102	Critical	9.8	100%	KEV	Fix
CVE-2019-9670	Critical	9.8	100%	KEV	Fix
CVE-2022-28219	Critical	9.8	97%	-	-
CVE-2024-22024	High	8.3	95%	-	-
CVE-2024-38653	High	7.5	92%	-	-
CVE-2017-12629	Critical	9.8	92%	-	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.