Security readout for executives and security teams
Plain-English summary
CVE-2021-46896 describes a buffer overflow in PX4-Autopilot that may let an attacker crash affected systems, causing denial of service. The public record does not provide severity, CVSS, fixed versions, or exact affected releases, so urgency depends on whether PX4-Autopilot is used in safety or operationally critical environments.
Executive priority
Prioritize assessment where PX4-Autopilot supports safety, flight, robotics, or mission operations. Without severity or affected versions, this should be tracked as an availability risk requiring vendor confirmation rather than treated as a confirmed broad emergency.
Technical view
The CVE states that a handler function processing msgid 332 in PX4-Autopilot has a buffer overflow leading to denial of service. The provided sources do not identify a CWE, affected version range, patch commit, CVSS score, or confirmed exploit details.
Likely exposure
Exposure is limited to environments running PX4-Autopilot where the vulnerable msgid 332 handler is present and reachable. The source bundle lists affected vendor, product versions, and CPEs as unavailable, so version-specific exposure cannot be confirmed from these sources.
Exploitation context
The CVE is not listed in KEV, and the supplied sources do not state active exploitation. The GitHub issue is public, but the bundle does not provide enough evidence to assess exploit maturity or weaponization.
Researcher notes
Key gaps are affected versions, fix status, severity scoring, and reachable attack surface. Analysis should begin with the referenced PX4 issue and local firmware provenance. Avoid assuming broader PX4 impact beyond the stated msgid 332 handler condition.
Mitigation direction
- Inventory systems and firmware using PX4-Autopilot.
- Review PX4 guidance linked from the GitHub issue.
- Apply a vendor-supported fixed release when identified.
- Restrict access to interfaces that can reach the relevant message handler.
- Monitor affected systems for unexpected crashes or restarts.
Validation and detection
- Confirm whether deployed firmware includes the msgid 332 handler.
- Compare deployed PX4 releases or commits against vendor guidance.
- Check operational logs for denial-of-service symptoms.
- Validate mitigations only in non-production safety testing.
- Document uncertainty where fixed versions are not confirmed.
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-2021-46896 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/PX4/PX4-Autopilot/issues/18369CVE 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.