Hard-coded credentials in Buffalo network devices
Priority LOW 28CWE-798Published · Updated
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-798.
Summary
Use of hard-coded credentials vulnerability in multiple Buffalo network devices allows a network-adjacent attacker to alter?configuration settings of the device. The affected products/versions are as follows: WZR-300HP firmware Ver. 2.00 and earlier, WZR-450HP firmware Ver. 2.00 and earlier, WZR-600DHP firmware Ver. 2.00 and earlier, WZR-900DHP firmware Ver. 1.15 and earlier, HW-450HP-ZWE firmware Ver. 2.00 and earlier, WZR-450HP-CWT firmware Ver. 2.00 and earlier, WZR-450HP-UB firmware Ver. 2.00 and earlier, WZR-600DHP2 firmware Ver. 1.15 and earlier, and WZR-D1100H firmware Ver. 2.00 and earlier.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00251 16th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| BUFFALO INC. | Buffalo network devices | WZR-300HP firmware Ver. 2.00 and earlier, WZR-450HP firmware Ver. 2.00 and earlier, WZR-600DHP firmware Ver. 2.00 and earlier, WZR-900DHP firmware Ver. 1.15 and earlier, HW-450HP-ZWE firmware Ver. 2.00 and earlier, WZR-450HP-CWT firmware Ver. 2.00 and earlier, WZR-450HP-UB firmware Ver. 2.00 and earlier, WZR-600DHP2 firmware Ver. 1.15 and earlier, and WZR-D1100H firmware Ver. 2.00 and earlier. | — | No fix listed | CNA |
- Buffalo network devices VendorBUFFALO INC. Affected WZR-300HP firmware Ver. 2.00 and earlier, WZR-450HP firmware Ver. 2.00 and earlier, WZR-600DHP firmware Ver. 2.00 and earlier, WZR-900DHP firmware Ver. 1.15 and earlier, HW-450HP-ZWE firmware Ver. 2.00 and earlier, WZR-450HP-CWT firmware Ver. 2.00 and earlier, WZR-450HP-UB firmware Ver. 2.00 and earlier, WZR-600DHP2 firmware Ver. 1.15 and earlier, and WZR-D1100H firmware Ver. 2.00 and earlier. Fixed in — No fix listed CNA
CPE configurations NVD · 18
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:buffalo:wzr-300hp_firmware:*:*:*:*:*:*:*:* | up to 2.00 | Vulnerable | BUFFALO INC. |
| cpe:2.3:h:buffalo:wzr-300hp:-:*:*:*:*:*:*:* | not specified by NVD | Running on | BUFFALO INC. |
| cpe:2.3:o:buffalo:wzr-450hp_firmware:*:*:*:*:*:*:*:* | up to 2.00 | Vulnerable | BUFFALO INC. |
| cpe:2.3:h:buffalo:wzr-450hp:-:*:*:*:*:*:*:* | not specified by NVD | Running on | BUFFALO INC. |
| cpe:2.3:o:buffalo:wzr-600dhp_firmware:*:*:*:*:*:*:*:* | up to 2.00 | Vulnerable | BUFFALO INC. |
| cpe:2.3:h:buffalo:wzr-600dhp:-:*:*:*:*:*:*:* | not specified by NVD | Running on | BUFFALO INC. |
| cpe:2.3:o:buffalo:wzr-900dhp_firmware:*:*:*:*:*:*:*:* | up to 1.15 | Vulnerable | BUFFALO INC. |
| cpe:2.3:h:buffalo:wzr-900dhp:-:*:*:*:*:*:*:* | not specified by NVD | Running on | BUFFALO INC. |
| cpe:2.3:o:buffalo:hw-450hp-zwe_firmware:*:*:*:*:*:*:*:* | up to 2.00 | Vulnerable | BUFFALO INC. |
| cpe:2.3:h:buffalo:hw-450hp-zwe:-:*:*:*:*:*:*:* | not specified by NVD | Running on | BUFFALO INC. |
- cpe:2.3:o:buffalo:wzr-300hp_firmware:*:*:*:*:*:*:*:* Versions up to 2.00 Vulnerable ·BUFFALO INC.
- cpe:2.3:h:buffalo:wzr-300hp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·BUFFALO INC.
- cpe:2.3:o:buffalo:wzr-450hp_firmware:*:*:*:*:*:*:*:* Versions up to 2.00 Vulnerable ·BUFFALO INC.
- cpe:2.3:h:buffalo:wzr-450hp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·BUFFALO INC.
- cpe:2.3:o:buffalo:wzr-600dhp_firmware:*:*:*:*:*:*:*:* Versions up to 2.00 Vulnerable ·BUFFALO INC.
- cpe:2.3:h:buffalo:wzr-600dhp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·BUFFALO INC.
- cpe:2.3:o:buffalo:wzr-900dhp_firmware:*:*:*:*:*:*:*:* Versions up to 1.15 Vulnerable ·BUFFALO INC.
- cpe:2.3:h:buffalo:wzr-900dhp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·BUFFALO INC.
- cpe:2.3:o:buffalo:hw-450hp-zwe_firmware:*:*:*:*:*:*:*:* Versions up to 2.00 Vulnerable ·BUFFALO INC.
- cpe:2.3:h:buffalo:hw-450hp-zwe:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·BUFFALO INC.
Show 8 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:buffalo:wzr-450hp-cwt_firmware:*:*:*:*:*:*:*:* | up to 2.00 | Vulnerable | BUFFALO INC. |
| cpe:2.3:h:buffalo:wzr-450hp-cwt:-:*:*:*:*:*:*:* | not specified by NVD | Running on | BUFFALO INC. |
| cpe:2.3:o:buffalo:wzr-450hp-ub_firmware:*:*:*:*:*:*:*:* | up to 2.00 | Vulnerable | BUFFALO INC. |
| cpe:2.3:h:buffalo:wzr-450hp-ub:-:*:*:*:*:*:*:* | not specified by NVD | Running on | BUFFALO INC. |
| cpe:2.3:o:buffalo:wzr-600dhp2_firmware:*:*:*:*:*:*:*:* | up to 1.15 | Vulnerable | BUFFALO INC. |
| cpe:2.3:h:buffalo:wzr-600dhp2:-:*:*:*:*:*:*:* | not specified by NVD | Running on | BUFFALO INC. |
| cpe:2.3:o:buffalo:wzr-d1100h_firmware:*:*:*:*:*:*:*:* | up to 2.00 | Vulnerable | BUFFALO INC. |
| cpe:2.3:h:buffalo:wzr-d1100h:-:*:*:*:*:*:*:* | not specified by NVD | Running on | BUFFALO INC. |
- cpe:2.3:o:buffalo:wzr-450hp-cwt_firmware:*:*:*:*:*:*:*:* Versions up to 2.00 Vulnerable ·BUFFALO INC.
- cpe:2.3:h:buffalo:wzr-450hp-cwt:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·BUFFALO INC.
- cpe:2.3:o:buffalo:wzr-450hp-ub_firmware:*:*:*:*:*:*:*:* Versions up to 2.00 Vulnerable ·BUFFALO INC.
- cpe:2.3:h:buffalo:wzr-450hp-ub:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·BUFFALO INC.
- cpe:2.3:o:buffalo:wzr-600dhp2_firmware:*:*:*:*:*:*:*:* Versions up to 1.15 Vulnerable ·BUFFALO INC.
- cpe:2.3:h:buffalo:wzr-600dhp2:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·BUFFALO INC.
- cpe:2.3:o:buffalo:wzr-d1100h_firmware:*:*:*:*:*:*:*:* Versions up to 2.00 Vulnerable ·BUFFALO INC.
- cpe:2.3:h:buffalo:wzr-d1100h:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·BUFFALO INC.
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2022-34840
- 2026-10-03 Alias added: GHSA-pgrg-rvjm-c6vq
References
More BUFFALO INC. Hw-450hp-zwe Firmware vulnerabilities
- TI-2021-02471 Improper access control vulnerability in Buffalo broadband routers (BHR-4GRV firmware… CVSS 3.1HIGH 8.8
- TI-2022-19509 Improper authentication in Buffalo network devices CVSS 3.1HIGH 8.8
- TI-2016-04161 BUFFALO WZR-600DHP3 devices with firmware 2.16 and earlier and WZR-S600DHP devices allow… CVSS 3.0MEDIUM 6.5
- TI-2022-18436 Hidden functionality vulnerability in multiple Buffalo network devices allows a… CVSS 3.1MEDIUM 6.8
- TI-2021-02470 Disclosure of sensitive information to an unauthorized user vulnerability in Buffalo… CVSS 3.1MEDIUM 4.3
Sources
- CVE-2022-34840 · CVE Program
- CVE-2022-34840 · NVD
- FIRST EPSS
- GHSA-pgrg-rvjm-c6vq · 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