CVE-2020-4450

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 34.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-06-05 · updated 2026-06-17
Weakness: CWE-502

Description

IBM WebSphere Application Server 8.5 and 9.0 traditional could allow a remote attacker to execute arbitrary code on the system with a specially-crafted sequence of serialized objects. IBM X-Force ID: 181231.

Affected products

IBM WebSphere Application Server: from 8.5.0.0 before 8.5.5.18; from 9.0.0.0 before 9.0.5.5 — fixed in 8.5.5.18, 9.0.5.5

How to fix

Upgrade to a fixed version: IBM WebSphere Application Server 8.5.5.18, 9.0.5.5. Check the vendor advisory for mitigations.

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/181231
https://www.ibm.com/support/pages/node/6220294
https://www.zerodayinitiative.com/advisories/ZDI-20-689/
https://exchange.xforce.ibmcloud.com/vulnerabilities/181231
https://www.ibm.com/support/pages/node/6220294
https://www.zerodayinitiative.com/advisories/ZDI-20-689/

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