Security readout for executives and security teams
Plain-English summary
This flaw affects RTI Connext DDS Professional and Secure. A local, low-privileged attacker could potentially run code by triggering a stack-based buffer overflow. The main business concern is disruption of systems that rely on affected DDS middleware, especially operational environments.
Executive priority
Treat as a moderate-priority middleware risk. It is not supported as actively exploited in the provided sources, but the availability impact can matter in operational systems. Prioritize environments where affected RTI components support production, safety, or industrial workflows.
Technical view
CVE-2021-38433 is CWE-121 in RTI Connext DDS Professional and Connext DDS Secure versions 4.2x to 6.1.0 per the description. CVSS 3.1 is 6.6: local access, low complexity, low privileges, no user interaction, with high availability impact.
Likely exposure
Exposure is limited to organizations running affected RTI Connext DDS Professional or Secure deployments. The source bundle specifically lists 4.2x affected entries and describes versions 4.2x to 6.1.0 as vulnerable.
Exploitation context
The source bundle does not show active exploitation, and KEV is false. Attack requirements are local access and low privileges, so this is not presented as remotely exploitable from the internet. Risk rises where many users or services can access affected hosts.
Researcher notes
Evidence is limited to the CVE summary and referenced advisories. The bundle does not provide trigger details, exploit status, or a named fixed version. Avoid assuming broader product coverage beyond RTI Connext DDS Professional and Secure.
Mitigation direction
- Review CISA advisory ICSA-21-315-02 for vendor remediation guidance.
- Check RTI support guidance for fixed versions or official mitigations.
- Prioritize upgrade or vendor-recommended remediation for affected deployments.
- Restrict local access to systems running affected RTI components.
- Apply least privilege to accounts that can interact with DDS hosts.
Validation and detection
- Inventory RTI Connext DDS Professional and Secure deployments.
- Record exact product versions and compare against 4.2x to 6.1.0.
- Identify affected hosts with local interactive or service account access.
- Confirm remediation status against CISA and RTI guidance.
- Track compensating access controls until vendor remediation is applied.
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.
CWE-121: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution 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-2021-38433 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
- 6.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
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:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H1.84.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.6MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.cisa.gov/uscert/ics/advisories/icsa-21-315-02CVE reference
- https://support.rti.com/s/login/?ec=302&startURL=%2Fs%2FCVE reference
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.
Stack-based Buffer Overflow
Stack-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.