What is CVE-2022-34840?

CVE-2022-34840 is a medium-severity vulnerability in Buffalo Hw-450hp-Zwe, classified under Use of Hard-coded Credentials. CVSS score: 6.5/10. Published 2022-12-07.

How severe is CVE-2022-34840?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Buffalo Hw-450hp-Zwe

CVE-2022-34840

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.

Published 2022-12-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.003 (14.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 14.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-798 — Use of Hard-coded Credentials

References

www.buffalo.jp/news/detail/20221003-01.html (Patch, Vendor Advisory)
jvn.jp/en/vu/JVNVU92805279/index.html (Third Party Advisory)

Frequently asked questions

What is CVE-2022-34840?: CVE-2022-34840 is a medium-severity vulnerability in Buffalo Hw-450hp-Zwe, classified under Use of Hard-coded Credentials. CVSS score: 6.5/10. Published 2022-12-07.
How severe is CVE-2022-34840?: Medium severity. CVSS v3 base score is 6.5 out of 10.