Security readout for executives and security teams
Plain-English summary
Some ELECOM wireless LAN routers have a buffer overflow that could let an unauthenticated attacker on the adjacent network run code on the device. Because a router controls network traffic, compromise could expose data, alter settings, or disrupt connectivity. The provided sources rate it high, but do not show active exploitation.
Executive priority
Treat as a high-priority network-edge device issue where affected models exist. Prioritize inventory and firmware remediation because successful compromise could give an unauthenticated nearby attacker control over routing infrastructure.
Technical view
CVE-2023-39454 is a CWE-120 buffer overflow in specified ELECOM router models. CVSS 3.0 is 8.8 with adjacent attack vector, low complexity, no privileges, and no user interaction. The stated impact is arbitrary code execution with high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to listed ELECOM wireless LAN router models running the affected firmware versions. The CVSS vector indicates attackers need adjacent-network reach, not necessarily internet exposure, but shared Wi-Fi or local-network presence may be enough.
Exploitation context
The bundle states unauthenticated arbitrary code execution is possible. It does not include exploit details, proof-of-concept status, public exploitation reports, or CISA KEV listing, so active exploitation should not be assumed from these sources.
Researcher notes
Evidence supports high impact but adjacent-network scope. The bundle names affected products and versions, CVSS, CWE-120, and arbitrary code execution. It does not provide root cause detail, vulnerable component, fixed versions, exploit maturity, or workaround specifics.
Mitigation direction
- Inventory ELECOM router models and firmware versions against the affected list.
- Review ELECOM and JVN guidance for fixed firmware or supported remediation.
- Update affected devices using vendor-supported firmware when available.
- Restrict untrusted access to Wi-Fi and local network segments.
- Replace unsupported affected devices if no vendor remediation is available.
Validation and detection
- Confirm whether any listed ELECOM models are deployed.
- Record exact firmware versions from device administration interfaces or asset data.
- Verify vendor advisories for each affected model before remediation.
- After remediation, confirm firmware no longer matches affected versions.
- Check network controls limiting adjacent or guest access to router management surfaces.
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-120: 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-2023-39454 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
- High
- CVSS
- 8.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:A/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.
SSVC decision data
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/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H2.85.9jpcertVulnerability scoring details
Base CVSS 3.0 score
8.8HighVector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://www.elecom.co.jp/news/security/20230711-01/CVE reference, jpcert
- https://jvn.jp/en/vu/JVNVU91630351/CVE reference, jpcert
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.
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.