Security readout for executives and security teams
Plain-English summary
This is a CSRF flaw in several ELECOM wireless LAN routers. If an administrator is logged into the device and visits a malicious page, the router may perform unintended actions. The provided sources do not describe active exploitation or specific attacker outcomes beyond unintended operations.
Executive priority
Treat this as a moderate operational risk for affected ELECOM routers. It is not cited as actively exploited, but it can enable unwanted configuration changes if administrators are tricked while logged in. Address during near-term network device maintenance.
Technical view
CVE-2026-20704 is CWE-352 affecting listed ELECOM WRC wireless LAN products at specified firmware versions and earlier. CVSS 4.0 is 5.1, network attack vector, low complexity, no privileges, and active user interaction required. Integrity impact is limited; confidentiality and availability impacts are not indicated.
Likely exposure
Exposure is most likely where affected ELECOM routers are still running the listed vulnerable firmware versions and administrators use the web interface from browsers that can reach attacker-controlled content.
Exploitation context
The source bundle marks KEV as false, and no provided source states active exploitation. Exploitation requires a logged-in user to access a malicious page, making phishing or web lure scenarios more relevant than direct unauthenticated compromise.
Researcher notes
Key uncertainty is impact detail: sources say unintended operations may occur but do not enumerate actions. Validation should focus on model and firmware matching, management-plane reachability, and whether vendor guidance identifies fixed builds for each product.
Mitigation direction
- Check ELECOM and JVN guidance for fixed firmware or vendor-supported workarounds.
- Prioritize firmware updates for affected models running versions at or below listed thresholds.
- Restrict router management access to trusted networks and administrator workstations.
- Log out of router administration sessions after configuration work.
- Avoid browsing external websites while authenticated to router management interfaces.
Validation and detection
- Inventory ELECOM wireless LAN devices by exact model and firmware version.
- Compare device firmware against the affected version list in the CVE bundle.
- Confirm whether router management interfaces are reachable from user browsing environments.
- After remediation, verify firmware exceeds the affected version threshold or matches vendor guidance.
- Review configuration history for unexpected administrative changes where logs are available.
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-352: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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 lookupCVE-2026-20704 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
- 5.1 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
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
2 official scoresWe 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:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N——jpcertCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N2.81.4jpcertVulnerability scoring details
Base CVSS 4.0 score
5.1MediumVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Base CVSS 3.0 score
4.3MediumVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
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/20260203-01/CVE reference, jpcert
- https://jvn.jp/en/jp/JVN94012927/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.
Cross-Site Request Forgery (CSRF)
Cross-Site Request Forgery (CSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.