Security readout for executives and security teams
Plain-English summary
CVE-2021-29843 can let a low-privileged network user disrupt affected IBM MQ Appliance deployments by triggering a message-properties processing issue. The documented impact is availability loss, not data theft or tampering.
Executive priority
Treat this as a moderate operational resilience issue. It is not described as data compromise, but MQ disruption can affect dependent business workflows, so remediate exposed or business-critical appliances first.
Technical view
IBM MQ Appliance 9.1 LTS, 9.1 CD, 9.2 LTS, and 9.2 CD are affected. CVSS 3.0 is 5.3 with network attack vector, low privileges, high complexity, no user interaction, and high availability impact only.
Likely exposure
Exposure is likely limited to organizations running the listed IBM MQ Appliance 9.1 or 9.2 release streams where low-privileged users can reach MQ over the network.
Exploitation context
The CVE is not marked KEV, and the provided sources do not report active exploitation. The CVSS vector indicates exploitation requires low privileges and high attack complexity.
Researcher notes
No CWE is supplied. Evidence supports availability-only impact through message-properties processing, with network reachability, low privileges, high complexity, and no user interaction required.
Mitigation direction
- Identify IBM MQ Appliance 9.1 LTS, 9.1 CD, 9.2 LTS, or 9.2 CD systems.
- Check IBM support advisory 6513681 for official fixes or mitigation guidance.
- Prioritize remediation for internet-facing or broadly reachable MQ deployments.
- Limit network access to MQ services to trusted users and systems.
- Monitor MQ availability and restart events during remediation planning.
Validation and detection
- Confirm product and version on each IBM MQ Appliance instance.
- Compare deployed versions against the affected releases in the CVE record.
- Review IBM X-Force ID 205203 for vendor vulnerability details.
- Verify vendor-recommended maintenance is applied in staging first.
- Check monitoring for unexplained MQ service disruption or availability degradation.
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-2021-29843 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/I:N/C:N/AC:H/S:U/A:H/UI: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/I:N/C:N/AC:H/S:U/A:H/UI: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/I:N/C:N/AC:H/S:U/A:H/UI: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/6513681CVE reference · x_refsource_CONFIRM
- ibm-mq-cve202129843-dos (205203)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.