Security readout for executives and security teams
Plain-English summary
This flaw affects IBM WebSphere Application Server and can let a remote attacker run code on the server by sending malicious serialized data. A successful attack could compromise confidentiality, integrity, and availability of affected systems. The source bundle does not show confirmed active exploitation.
Executive priority
Treat as high priority for business-critical or externally reachable WebSphere systems. The business risk is potential full server compromise, but the supplied sources do not show known active exploitation.
Technical view
CVE-2020-4589 is a high-severity deserialization-related remote code execution issue in IBM WebSphere Application Server 7.0, 8.0, 8.5, and 9.0. CVSS 3.0 is 8.1: network reachable, no privileges, no user interaction, high complexity, and high impact to confidentiality, integrity, and availability.
Likely exposure
Exposure is most likely where affected WebSphere Application Server versions are deployed and reachable by untrusted network users or applications that process serialized objects from untrusted sources.
Exploitation context
The sources describe remote code execution with a specially crafted sequence of serialized objects. CISA KEV is false, and the CVSS exploit maturity is unproven, so the provided evidence does not support claiming active exploitation.
Researcher notes
Key constraints are the high attack complexity and unproven exploit maturity. The bundle does not provide affected fix packs, concrete patches, or safe validation indicators, so verification should stay inventory-based and vendor-guidance-based.
Mitigation direction
- Identify all IBM WebSphere Application Server 7.0, 8.0, 8.5, and 9.0 deployments.
- Apply IBM’s security bulletin guidance for CVE-2020-4589.
- Reduce untrusted network reachability to affected WebSphere servers until remediated.
- Review applications for deserialization of data from untrusted sources.
- Monitor IBM X-Force and vendor advisories for updated remediation details.
Validation and detection
- Confirm installed WebSphere versions and fix levels against IBM guidance.
- Verify affected servers are not broadly reachable from untrusted networks.
- Review application paths that accept or process serialized objects.
- Check logs for unusual requests, crashes, or unexpected process activity.
- Document remediation status for each affected WebSphere instance.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
Execution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-4589 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.1 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/PR:N/I:H/C:H/A:H/UI:N/AC:H/S:U/AV:N/RC:C/E:U/RL:O
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/PR:N/I:H/C:H/A:H/UI:N/AC:H/S:U/AV:N/RC:C/E:U/RL:O2.25.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
8.1HighVector: CVSS:3.0/PR:N/I:H/C:H/A:H/UI:N/AC:H/S:U/AV:N/RC:C/E:U/RL:O
Source materials
- CVE List V5 sourceCVE List V5
- https://www.ibm.com/support/pages/node/6258333CVE reference · x_refsource_CONFIRM
- ibm-websphere-cve20204589-code-exec (184585)CVE reference · vdb-entry, x_refsource_XF
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.