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No exploitation reportedFix available

CVE-2020-4450

No exploitation reported by the sources we read.

  • Published2020-06-05
  • Fixed in9.0.5.5 · 8.5.5.18
  • WeaknessCWE-502

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2020-06-0517:15CVE publishedNVD

Versions per branch

NVD
Ibm websphere application server
BranchAffectedFixed in
9.0≥ 9.0.0.0, < 9.0.5.59.0.5.5
8.5≥ 8.5.0.0, < 8.5.5.188.5.5.18

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Ibm websphere application server to 9.0.5.5 · 8.5.5.18

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.19.8read 2026-10-23
  • CNACVSS 3.09.8known since 2026-10-23
  • NVDCVSS 2.010read 2026-10-23
  • NVDweakness (CWE)CWE-502read 2026-10-23
  • FIRST EPSSEPSS score34.7 %read 2026-11-04
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2020-06-05
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-fvf6-4v5x-94mq

Frequently asked questions

What is CVE-2020-4450?

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.

Is CVE-2020-4450 actively exploited?

Active exploitation of CVE-2020-4450 has not been confirmed. Its EPSS score was 34.7% on 2026-11-04, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-4450?

CVE-2020-4450 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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