Security readout for executives and security teams
Plain-English summary
CVE-2020-4267 is a denial-of-service issue in IBM MQ and MQ Appliance. An authenticated user could cause a memory leak, potentially degrading or interrupting messaging services. It is not described as data theft or privilege escalation.
Executive priority
Treat as a moderate availability risk for business-critical messaging environments. Prioritize remediation where MQ supports customer-facing, payment, operational, or integration workflows.
Technical view
The source describes a memory-leak denial of service affecting IBM MQ and MQ Appliance 8.0, 9.1 LTS, and 9.1 CD. CVSS 3.0 score is 5.3 with network access, low privileges, no user interaction, high attack complexity, and high availability impact.
Likely exposure
Exposure is most likely where affected IBM MQ or MQ Appliance versions are deployed and reachable by authenticated users. The provided affected list names IBM MQ Appliance 8.0.0.x and 9.1.x levels.
Exploitation context
The bundle does not show CISA KEV listing or active exploitation evidence. Exploitation requires authentication and is rated high complexity, but successful abuse could disrupt MQ availability through memory exhaustion.
Researcher notes
Do not assume unauthenticated exposure or code execution from these sources. The key validation work is version confirmation, authentication boundary review, and correlation with IBM's advisory and X-Force entry.
Mitigation direction
- Review IBM advisory 6195384 for affected levels and official remediation.
- Apply IBM-provided fixes or recommended upgrade path for deployed versions.
- Restrict MQ administrative and application access to trusted authenticated users.
- Monitor MQ memory growth and service stability until remediation is complete.
Validation and detection
- Inventory IBM MQ and MQ Appliance versions in production and nonproduction.
- Compare versions against the affected 8.0.0.x and 9.1.x levels listed.
- Confirm IBM remediation has been applied where applicable.
- Review logs and monitoring for abnormal memory growth or service restarts.
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.
CVE-2020-4267 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
- Medium
- CVSS
- 5.3 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/A:H/C:N/UI:N/AC:H/S:U/I:N/PR:L/AV:N/RC:C/RL:O/E:U
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/A:H/C:N/UI:N/AC:H/S:U/I:N/PR:L/AV:N/RC:C/RL:O/E:U1.63.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
5.3MediumVector: CVSS:3.0/A:H/C:N/UI:N/AC:H/S:U/I:N/PR:L/AV:N/RC:C/RL:O/E:U
Source materials
- CVE List V5 sourceCVE List V5
- https://www.ibm.com/support/pages/node/6195384CVE reference · x_refsource_CONFIRM
- ibm-mq-cve20204267-dos (175840)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.