Security readout for executives and security teams
Plain-English summary
CVE-2021-39244 is an authenticated command injection issue in Altus Nexto, Nexto Xpress, and Hadron Xtorm devices. A logged-in attacker could abuse the getlogs.cgi tcpdump feature to run unintended system commands. The source bundle does not provide CVSS scoring, a confirmed fix version, or evidence of active exploitation.
Executive priority
Treat this as a high-priority operational technology exposure review, especially for environments using the named Altus devices. The immediate business task is to find affected assets, restrict access, and obtain vendor remediation guidance before assuming the issue is resolved.
Technical view
The vulnerability is described as authenticated semi-blind command injection via parameter injection in the getlogs.cgi tcpdump feature. Listed affected firmware includes multiple Nexto NX, Nexto Xpress XP, and Hadron Xtorm HX3040 versions. The CVE record has no CWE or CVSS data in the supplied bundle.
Likely exposure
Exposure is most likely where affected Altus devices are deployed with reachable authenticated web or management access. Risk is higher if device administration interfaces are accessible from broad internal networks, remote access paths, or weakly controlled accounts.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The issue requires authentication, which lowers opportunistic exposure but remains serious if credentials are shared, reused, phished, or held by compromised operators.
Researcher notes
Evidence is specific about affected products, versions, and the vulnerable feature, but incomplete on scoring, exploit status, and remediation. Avoid claiming exploitation in the wild. Validation should focus on asset/version confirmation, access path review, and vendor advisory tracking.
Mitigation direction
- Identify affected Altus model and firmware versions in asset inventory.
- Check Altus guidance for fixed firmware, workarounds, or support instructions.
- Restrict device management access to trusted administration networks only.
- Review and tighten accounts with access to device diagnostic features.
- Monitor for unusual authenticated diagnostic or log collection activity.
Validation and detection
- Compare deployed models and firmware against the CVE affected version list.
- Confirm management interfaces are not exposed to the internet or broad networks.
- Review access logs for unexpected authenticated use of diagnostic features.
- Verify whether Altus has published applicable remediation for each device.
- Document any compensating network controls around affected devices.
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-2021-39244 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://www.altus.com.br/CVE reference · x_refsource_MISC
- https://seclists.org/fulldisclosure/2021/Aug/21CVE reference · x_refsource_MISC
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.