CVE-2021-20353

Severity: high (CVSS 8.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 5.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-02-10 · updated 2026-06-17
Weakness: CWE-611

Description

IBM WebSphere Application Server 7.0, 8.0, 8.5, and 9.0 is vulnerable to an 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: 194882.

Affected products

IBM WebSphere Application Server: from 7.0.0.0 before 7.0.0.45; from 8.0.0.0 before 8.0.0.15; from 8.5.0.0 before 8.5.5.20; from 9.0.0.0 before 9.0.5.7 — fixed in 7.0.0.45, 8.0.0.15, 8.5.5.20, 9.0.5.7

How to fix

Upgrade to a fixed version: IBM WebSphere Application Server 7.0.0.45, 8.0.0.15, 8.5.5.20, 9.0.5.7. Check the vendor advisory for mitigations.

References

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