OS command injection in ELECOM LAN routers
Priority LOW 30CWE-78Published · Updated
Key facts
- Attack vector
- Adjacent network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-78.
Summary
ELECOM LAN routers (WRH-733GBK firmware v1.02.9 and prior and WRH-733GWH firmware v1.02.9 and prior) allows a network-adjacent attacker with an administrator privilege to execute arbitrary OS commands via unspecified vectors.
Why it matters now
EPSS 0.00436 38th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| ELECOM CO.,LTD. | ELECOM LAN routers | WRH-733GBK firmware v1.02.9 and prior and WRH-733GWH firmware v1.02.9 and prior | — | No fix listed | CNA |
- ELECOM LAN routers VendorELECOM CO.,LTD. Affected WRH-733GBK firmware v1.02.9 and prior and WRH-733GWH firmware v1.02.9 and prior Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:elecom:wrh-733gbk_firmware:*:*:*:*:*:*:*:* | up to 1.02.9 | Vulnerable | ELECOM CO.,LTD. |
| cpe:2.3:h:elecom:wrh-733gbk:-:*:*:*:*:*:*:* | not specified by NVD | Running on | ELECOM CO.,LTD. |
| cpe:2.3:o:elecom:wrh-733gwh_firmware:*:*:*:*:*:*:*:* | up to 1.02.9 | Vulnerable | ELECOM CO.,LTD. |
| cpe:2.3:h:elecom:wrh-733gwh:-:*:*:*:*:*:*:* | not specified by NVD | Running on | ELECOM CO.,LTD. |
- cpe:2.3:o:elecom:wrh-733gbk_firmware:*:*:*:*:*:*:*:* Versions up to 1.02.9 Vulnerable ·ELECOM CO.,LTD.
- cpe:2.3:h:elecom:wrh-733gbk:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.
- cpe:2.3:o:elecom:wrh-733gwh_firmware:*:*:*:*:*:*:*:* Versions up to 1.02.9 Vulnerable ·ELECOM CO.,LTD.
- cpe:2.3:h:elecom:wrh-733gwh:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-20853
- 2026-10-03 Alias added: GHSA-mjp9-fwhq-c9rm
References
More ELECOM CO.,LTD. Wrh-733gbk Firmware vulnerabilities
- TI-2021-04068 OS command injection in ELECOM LAN routers CVSS 3.1MEDIUM 6.8
- TI-2021-04066 Buffer overflow in ELECOM LAN routers CVSS 3.1MEDIUM 6.8
- TI-2021-04070 Cross-site scripting in ELECOM LAN routers CVSS 3.1MEDIUM 5.4
- TI-2021-04069 Cross-site scripting in ELECOM LAN routers CVSS 3.1MEDIUM 5.4
Sources
- CVE-2021-20853 · CVE Program
- CVE-2021-20853 · NVD
- FIRST EPSS
- GHSA-mjp9-fwhq-c9rm · GitHub Advisory Database · CC BY 4.0
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