Security readout for executives and security teams
Plain-English summary
CVE-2021-37384 affects some Furukawa ONU devices and allows a remote unauthenticated user to run arbitrary commands through the web interface. For organizations using these network edge devices, compromise could mean loss of device control, traffic disruption, or a foothold into connected networks.
Executive priority
Treat this as urgent for environments with Furukawa ONUs or exposed ONU management. The vulnerability is critical because it is remote, unauthenticated, and can allow command execution, but prioritization depends on confirming affected devices and exposure.
Technical view
The CVE describes a CWE-94 code injection issue in the web interface of some Furukawa ONU models. The CVSS 3.1 score is 9.8 with network access, low complexity, no privileges, and no user interaction required. The structured affected product and version fields are not populated.
Likely exposure
Exposure is most likely where Furukawa ONU web management interfaces are reachable from the internet, customer networks, or other untrusted segments. The provided CVE data does not identify exact models, versions, CPEs, or deployment prevalence.
Exploitation context
The sources support remote unauthenticated command execution through the web interface. The provided data says this CVE is not in KEV, and no cited source establishes active exploitation. Public references exist, but evidence of exploitation in the wild is incomplete.
Researcher notes
The public record is high impact but incomplete: affected product, version, and CPE fields are listed as n/a. Avoid assuming all Furukawa ONUs are affected. Focus validation on model identification, management-plane exposure, and vendor-confirmed firmware status.
Mitigation direction
- Inventory Furukawa ONU devices and identify exposed web management interfaces.
- Check Furukawa or operator guidance for affected models, firmware, and fixes.
- Restrict ONU web management to trusted administrative networks only.
- Block internet access to management interfaces wherever operationally possible.
- Monitor device administration logs and network telemetry for suspicious access.
Validation and detection
- Confirm whether any deployed ONU devices are Furukawa models.
- Review firmware and model details against vendor or operator advisories.
- Verify web management is not reachable from untrusted networks.
- Check external attack-surface scans for exposed ONU management pages.
- Review recent management activity for unexpected remote access.
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-94: Code execution behavior lookup
Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process telemetry. 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-2021-37384 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
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://cwe.mitre.org/data/definitions/94.htmlCVE reference
- https://owasp.org/www-community/attacks/Code_InjectionCVE reference
- https://gist.githubusercontent.com/LuigiPolidorio/9fe61cf2edee63152161ffc52c39f6cd/raw/529cf49103e0fdf4eeb970fa1f62fa508ebe7c3c/reference.txtCVE reference
- https://www.softwall.com.br/cves/publicacao-rce-html-injection-furukawa/CVE 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.
Improper Control of Generation of Code ('Code Injection')
Improper Control of Generation of Code ('Code Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.