Improper access control vulnerability in ELECOM routers (WRC-1167GST2 firmware v1.25 and…
Priority LOW 39Published · Updated
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
Improper access control vulnerability in ELECOM routers (WRC-1167GST2 firmware v1.25 and prior, WRC-1167GST2A firmware v1.25 and prior, WRC-1167GST2H firmware v1.25 and prior, WRC-2533GS2-B firmware v1.52 and prior, WRC-2533GS2-W firmware v1.52 and prior, WRC-1750GS firmware v1.03 and prior, WRC-1750GSV firmware v2.11 and prior, WRC-1900GST firmware v1.03 and prior, WRC-2533GST firmware v1.03 and prior, WRC-2533GSTA firmware v1.03 and prior, WRC-2533GST2 firmware v1.25 and prior, WRC-2533GST2SP firmware v1.25 and prior, WRC-2533GST2-G firmware v1.25 and prior, and EDWRC-2533GST2 firmware v1.25 and prior) allows a network-adjacent unauthenticated attacker to bypass access restriction, and to start the telnet service and execute an arbitrary OS command via unspecified vectors.
Why it matters now
EPSS 0.00518 44th 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 routers | (WRC-1167GST2 firmware v1.25 and prior, WRC-1167GST2A firmware v1.25 and prior, WRC-1167GST2H firmware v1.25 and prior, WRC-2533GS2-B firmware v1.52 and prior, WRC-2533GS2-W firmware v1.52 and prior, WRC-1750GS firmware v1.03 and prior, WRC-1750GSV firmware v2.11 and prior, WRC-1900GST firmware v1.03 and prior, WRC-2533GST firmware v1.03 and prior, WRC-2533GSTA firmware v1.03 and prior, WRC-2533GST2 firmware v1.25 and prior, WRC-2533GST2SP firmware v1.25 and prior, WRC-2533GST2-G firmware v1.25 and prior, and EDWRC-2533GST2 firmware v1.25 and prior) | — | No fix listed | CNA |
- ELECOM routers VendorELECOM CO.,LTD. Affected (WRC-1167GST2 firmware v1.25 and prior, WRC-1167GST2A firmware v1.25 and prior, WRC-1167GST2H firmware v1.25 and prior, WRC-2533GS2-B firmware v1.52 and prior, WRC-2533GS2-W firmware v1.52 and prior, WRC-1750GS firmware v1.03 and prior, WRC-1750GSV firmware v2.11 and prior, WRC-1900GST firmware v1.03 and prior, WRC-2533GST firmware v1.03 and prior, WRC-2533GSTA firmware v1.03 and prior, WRC-2533GST2 firmware v1.25 and prior, WRC-2533GST2SP firmware v1.25 and prior, WRC-2533GST2-G firmware v1.25 and prior, and EDWRC-2533GST2 firmware v1.25 and prior) Fixed in — No fix listed CNA
CPE configurations NVD · 28
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:elecom:wrc-1167gst2_firmware:*:*:*:*:*:*:*:* | up to 1.25 | Vulnerable | ELECOM CO.,LTD. |
| cpe:2.3:h:elecom:wrc-1167gst2:-:*:*:*:*:*:*:* | not specified by NVD | Running on | ELECOM CO.,LTD. |
| cpe:2.3:o:elecom:wrc-1167gst2a_firmware:*:*:*:*:*:*:*:* | up to 1.25 | Vulnerable | ELECOM CO.,LTD. |
| cpe:2.3:h:elecom:wrc-1167gst2a:-:*:*:*:*:*:*:* | not specified by NVD | Running on | ELECOM CO.,LTD. |
| cpe:2.3:o:elecom:wrc-1167gst2h_firmware:*:*:*:*:*:*:*:* | up to 1.25 | Vulnerable | ELECOM CO.,LTD. |
| cpe:2.3:h:elecom:wrc-1167gst2h:-:*:*:*:*:*:*:* | not specified by NVD | Running on | ELECOM CO.,LTD. |
| cpe:2.3:o:elecom:wrc-2533gs2-b_firmware:*:*:*:*:*:*:*:* | up to 1.52 | Vulnerable | ELECOM CO.,LTD. |
| cpe:2.3:h:elecom:wrc-2533gs2-b:-:*:*:*:*:*:*:* | not specified by NVD | Running on | ELECOM CO.,LTD. |
| cpe:2.3:o:elecom:wrc-2533gs2-w_firmware:*:*:*:*:*:*:*:* | up to 1.52 | Vulnerable | ELECOM CO.,LTD. |
| cpe:2.3:h:elecom:wrc-2533gs2-w:-:*:*:*:*:*:*:* | not specified by NVD | Running on | ELECOM CO.,LTD. |
- cpe:2.3:o:elecom:wrc-1167gst2_firmware:*:*:*:*:*:*:*:* Versions up to 1.25 Vulnerable ·ELECOM CO.,LTD.
- cpe:2.3:h:elecom:wrc-1167gst2:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.
- cpe:2.3:o:elecom:wrc-1167gst2a_firmware:*:*:*:*:*:*:*:* Versions up to 1.25 Vulnerable ·ELECOM CO.,LTD.
- cpe:2.3:h:elecom:wrc-1167gst2a:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.
- cpe:2.3:o:elecom:wrc-1167gst2h_firmware:*:*:*:*:*:*:*:* Versions up to 1.25 Vulnerable ·ELECOM CO.,LTD.
- cpe:2.3:h:elecom:wrc-1167gst2h:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.
- cpe:2.3:o:elecom:wrc-2533gs2-b_firmware:*:*:*:*:*:*:*:* Versions up to 1.52 Vulnerable ·ELECOM CO.,LTD.
- cpe:2.3:h:elecom:wrc-2533gs2-b:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.
- cpe:2.3:o:elecom:wrc-2533gs2-w_firmware:*:*:*:*:*:*:*:* Versions up to 1.52 Vulnerable ·ELECOM CO.,LTD.
- cpe:2.3:h:elecom:wrc-2533gs2-w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.
Show 18 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:elecom:wrc-1750gs_firmware:*:*:*:*:*:*:*:* | up to 1.03 | Vulnerable | ELECOM CO.,LTD. |
| cpe:2.3:h:elecom:wrc-1750gs:-:*:*:*:*:*:*:* | not specified by NVD | Running on | ELECOM CO.,LTD. |
| cpe:2.3:o:elecom:wrc-1750gsv_firmware:*:*:*:*:*:*:*:* | up to 2.11 | Vulnerable | ELECOM CO.,LTD. |
| cpe:2.3:h:elecom:wrc-1750gsv:-:*:*:*:*:*:*:* | not specified by NVD | Running on | ELECOM CO.,LTD. |
| cpe:2.3:o:elecom:wrc-1900gst_firmware:*:*:*:*:*:*:*:* | up to 1.03 | Vulnerable | ELECOM CO.,LTD. |
| cpe:2.3:h:elecom:wrc-1900gst:-:*:*:*:*:*:*:* | not specified by NVD | Running on | ELECOM CO.,LTD. |
| cpe:2.3:o:elecom:wrc-2533gst_firmware:*:*:*:*:*:*:*:* | up to 1.03 | Vulnerable | ELECOM CO.,LTD. |
| cpe:2.3:h:elecom:wrc-2533gst:-:*:*:*:*:*:*:* | not specified by NVD | Running on | ELECOM CO.,LTD. |
| cpe:2.3:o:elecom:wrc-2533gst2_firmware:*:*:*:*:*:*:*:* | up to 1.25 | Vulnerable | ELECOM CO.,LTD. |
| cpe:2.3:h:elecom:wrc-2533gst2:-:*:*:*:*:*:*:* | not specified by NVD | Running on | ELECOM CO.,LTD. |
| cpe:2.3:o:elecom:wrc-2533gsta_firmware:*:*:*:*:*:*:*:* | up to 1.03 | Vulnerable | ELECOM CO.,LTD. |
| cpe:2.3:h:elecom:wrc-2533gsta:-:*:*:*:*:*:*:* | not specified by NVD | Running on | ELECOM CO.,LTD. |
| cpe:2.3:o:elecom:wrc-2533gst2sp_firmware:*:*:*:*:*:*:*:* | up to 1.25 | Vulnerable | ELECOM CO.,LTD. |
| cpe:2.3:h:elecom:wrc-2533gst2sp:-:*:*:*:*:*:*:* | not specified by NVD | Running on | ELECOM CO.,LTD. |
| cpe:2.3:o:elecom:wrc-2533gst2-g_firmware:*:*:*:*:*:*:*:* | up to 1.25 | Vulnerable | ELECOM CO.,LTD. |
| cpe:2.3:h:elecom:wrc-2533gst2-g:-:*:*:*:*:*:*:* | not specified by NVD | Running on | ELECOM CO.,LTD. |
| cpe:2.3:o:elecom:edwrc-2533gst2_firmware:*:*:*:*:*:*:*:* | up to 1.25 | Vulnerable | ELECOM CO.,LTD. |
| cpe:2.3:h:elecom:edwrc-2533gst2:-:*:*:*:*:*:*:* | not specified by NVD | Running on | ELECOM CO.,LTD. |
- cpe:2.3:o:elecom:wrc-1750gs_firmware:*:*:*:*:*:*:*:* Versions up to 1.03 Vulnerable ·ELECOM CO.,LTD.
- cpe:2.3:h:elecom:wrc-1750gs:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.
- cpe:2.3:o:elecom:wrc-1750gsv_firmware:*:*:*:*:*:*:*:* Versions up to 2.11 Vulnerable ·ELECOM CO.,LTD.
- cpe:2.3:h:elecom:wrc-1750gsv:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.
- cpe:2.3:o:elecom:wrc-1900gst_firmware:*:*:*:*:*:*:*:* Versions up to 1.03 Vulnerable ·ELECOM CO.,LTD.
- cpe:2.3:h:elecom:wrc-1900gst:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.
- cpe:2.3:o:elecom:wrc-2533gst_firmware:*:*:*:*:*:*:*:* Versions up to 1.03 Vulnerable ·ELECOM CO.,LTD.
- cpe:2.3:h:elecom:wrc-2533gst:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.
- cpe:2.3:o:elecom:wrc-2533gst2_firmware:*:*:*:*:*:*:*:* Versions up to 1.25 Vulnerable ·ELECOM CO.,LTD.
- cpe:2.3:h:elecom:wrc-2533gst2:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.
- cpe:2.3:o:elecom:wrc-2533gsta_firmware:*:*:*:*:*:*:*:* Versions up to 1.03 Vulnerable ·ELECOM CO.,LTD.
- cpe:2.3:h:elecom:wrc-2533gsta:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.
- cpe:2.3:o:elecom:wrc-2533gst2sp_firmware:*:*:*:*:*:*:*:* Versions up to 1.25 Vulnerable ·ELECOM CO.,LTD.
- cpe:2.3:h:elecom:wrc-2533gst2sp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.
- cpe:2.3:o:elecom:wrc-2533gst2-g_firmware:*:*:*:*:*:*:*:* Versions up to 1.25 Vulnerable ·ELECOM CO.,LTD.
- cpe:2.3:h:elecom:wrc-2533gst2-g:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.
- cpe:2.3:o:elecom:edwrc-2533gst2_firmware:*:*:*:*:*:*:*:* Versions up to 1.25 Vulnerable ·ELECOM CO.,LTD.
- cpe:2.3:h:elecom:edwrc-2533gst2:-:*:*:*:*:*:*:* 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-2021-20864
- 2026-10-03 Alias added: GHSA-3p76-j79h-ff2w
References
More ELECOM CO.,LTD. Edwrc-2533gst2 Firmware vulnerabilities
- TI-2021-04074 Cross-site request forgery in ELECOM LAN routers CVSS 3.1HIGH 8.8
- TI-2022-09466 Improper access control vulnerability in ELECOM LAN routers (WRC-1167GST2 firmware v1.25… CVSS 3.1HIGH 8.8
- TI-2021-04075 Improper access control vulnerability in ELECOM LAN routers (WRC-1167GST2 firmware v1.25… CVSS 3.1HIGH 8.8
- TI-2021-04077 OS command injection in ELECOM routers CVSS 3.1HIGH 8.0
- TI-2021-04073 OS command injection in ELECOM LAN routers CVSS 3.1HIGH 8.0
- TI-2021-04076 Improper access control vulnerability in ELECOM routers (WRC-1167GST2 firmware v1.25 and… CVSS 3.1MEDIUM 4.3
Sources
- CVE-2021-20864 · CVE Program
- CVE-2021-20864 · NVD
- FIRST EPSS
- GHSA-3p76-j79h-ff2w · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences