CyberSecBulletin
CVE-2022-40966NVD status: Modified

Buffalo network devices: Improper Authentication

Published Updated By the CyberSecBulletin desk

CVE-2022-40966 is a high-severity improper authentication vulnerability in Buffalo network devices from Buffalo, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited from the same local network by an unauthenticated attacker, without any action from a user. There is no confirmed exploitation so far. EPSS estimates a 0.36% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Check which version of Buffalo network devices you run against the affected versions below, and install the vendor's latest release.
  2. Read the advisory on buffalo.jp for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
BUFFALOBuffalo network devicesNot specified in the recordNot stated
BuffaloWcr-300 Firmware1.87 and earlierNot stated
BuffaloWhr-hp-g300n Firmware2.00 and earlierNot stated
BuffaloWhr-hp-gn Firmware1.87 and earlierNot stated
BuffaloWpl-05g300 Firmware1.88 and earlierNot stated
BuffaloWrm-d2133hp Firmware2.85 and earlierNot stated
BuffaloWrm-d2133hs Firmware2.96 and earlierNot stated
BuffaloWtr-m2133hp Firmware2.85 and earlierNot stated
BuffaloWtr-m2133hs Firmware2.96 and earlierNot stated
BuffaloWxr-1900dhp Firmware2.50 and earlierNot stated
BuffaloWxr-1900dhp2 Firmware2.59 and earlierNot stated
BuffaloWxr-1900dhp3 Firmware2.63 and earlierNot stated
BuffaloWxr-5950ax12 Firmware3.40 and earlierNot stated
BuffaloWxr-6000ax12b Firmware3.40 and earlierNot stated
BuffaloWxr-6000ax12s Firmware3.40 and earlierNot stated
BuffaloWzr-300hp Firmware2.00 and earlierNot stated
BuffaloWzr-450hp Firmware2.00 and earlierNot stated
BuffaloWzr-600dhp Firmware2.00 and earlierNot stated
BuffaloWzr-900dhp Firmware1.15 and earlierNot stated
BuffaloWzr-1750dhp2 Firmware2.31 and earlierNot stated
BuffaloWzr-hp-ag300h Firmware1.76 and earlierNot stated
BuffaloWzr-hp-g302h Firmware1.86 and earlierNot stated
BuffaloWem-1266 Firmware2.85 and earlierNot stated
BuffaloWem-1266wp Firmware2.85 and earlierNot stated
BuffaloWlae-ag300n Firmware1.86 and earlierNot stated

Version data comes from the organisation that assigned the CVE; 35 further products are omitted here. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
AdjacentThe attacker must be on the same local network segment.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.18.8HighNVD
CVSS 3.18.8HighCISA (ADP)

Official description

Authentication bypass vulnerability in multiple Buffalo network devices allows a network-adjacent attacker to bypass authentication and access the device. The affected products/versions are as follows: WCR-300 firmware Ver. 1.87 and earlier, WHR-HP-G300N firmware Ver. 2.00 and earlier, WHR-HP-GN firmware Ver. 1.87 and earlier, WPL-05G300 firmware Ver. 1.88 and earlier, WRM-D2133HP firmware Ver. 2.85 and earlier, WRM-D2133HS firmware Ver. 2.96 and earlier, WTR-M2133HP firmware Ver. 2.85 and earlier, WTR-M2133HS firmware Ver. 2.96 and earlier, WXR-1900DHP firmware Ver. 2.50 and earlier, WXR-1900DHP2 firmware Ver. 2.59 and earlier, WXR-1900DHP3 firmware Ver. 2.63 and earlier, WXR-5950AX12 firmware Ver. 3.40 and earlier, WXR-6000AX12B firmware Ver. 3.40 and earlier, WXR-6000AX12S firmware Ver. 3.40 and earlier, 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, WZR-1750DHP2 firmware Ver. 2.31 and earlier, WZR-HP-AG300H firmware Ver. 1.76 and earlier, WZR-HP-G302H firmware Ver. 1.86 and earlier, WEM-1266 firmware Ver. 2.85 and earlier, WEM-1266WP firmware Ver. 2.85 and earlier, WLAE-AG300N firmware Ver. 1.86 and earlier, FS-600DHP firmware Ver. 3.40 and earlier, FS-G300N firmware Ver. 3.14 and earlier, FS-HP-G300N firmware Ver. 3.33 and earlier, FS-R600DHP firmware Ver. 3.40 and earlier, BHR-4GRV firmware Ver. 2.00 and earlier, DWR-HP-G300NH firmware Ver. 1.84 and earlier, DWR-PG firmware Ver. 1.83 and earlier, HW-450HP-ZWE firmware Ver. 2.00 and earlier, WER-A54G54 firmware Ver. 1.43 and earlier, WER-AG54 firmware Ver. 1.43 and earlier, WER-AM54G54 firmware Ver. 1.43 and earlier, WER-AMG54 firmware Ver. 1.43 and earlier, WHR-300 firmware Ver. 2.00 and earlier, WHR-300HP firmware Ver. 2.00 and earlier, WHR-AM54G54 firmware Ver. 1.43 and earlier, WHR-AMG54 firmware Ver. 1.43 and earlier, WHR-AMPG firmware Ver. 1.52 and earlier, WHR-G firmware Ver. 1.49 and earlier, WHR-G300N firmware Ver. 1.65 and earlier, WHR-G301N firmware Ver. 1.87 and earlier, WHR-G54S firmware Ver. 1.43 and earlier, WHR-G54S-NI firmware Ver. 1.24 and earlier, WHR-HP-AMPG firmware Ver. 1.43 and earlier, WHR-HP-G firmware Ver. 1.49 and earlier, WHR-HP-G54 firmware Ver. 1.43 and earlier, WLI-H4-D600 firmware Ver. 1.88 and earlier, WS024BF firmware Ver. 1.60 and earlier, WS024BF-NW firmware Ver. 1.60 and earlier, WXR-1750DHP firmware Ver. 2.60 and earlier, WXR-1750DHP2 firmware Ver. 2.60 and earlier, WZR-1166DHP firmware Ver. 2.18 and earlier, WZR-1166DHP2 firmware Ver. 2.18 and earlier, WZR-1750DHP firmware Ver. 2.30 and earlier, WZR2-G300N firmware Ver. 1.55 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, WZR-600DHP3 firmware Ver. 2.19 and earlier, WZR-900DHP2 firmware Ver. 2.19 and earlier, WZR-AGL300NH firmware Ver. 1.55 and earlier, WZR-AMPG144NH firmware Ver. 1.49 and earlier, WZR-AMPG300NH firmware Ver. 1.51 and earlier, WZR-D1100H firmware Ver. 2.00 and earlier, WZR-G144N firmware Ver. 1.48 and earlier, WZR-G144NH firmware Ver. 1.48 and earlier, WZR-HP-G300NH firmware Ver. 1.84 and earlier, WZR-HP-G301NH firmware Ver. 1.84 and earlier, WZR-HP-G450H firmware Ver. 1.90 and earlier, WZR-S1750DHP firmware Ver. 2.32 and earlier, WZR-S600DHP firmware Ver. 2.19 and earlier, and WZR-S900DHP firmware Ver. 2.19 and earlier.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Authentication

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

How developers prevent this class of flaw

  • Use an authentication framework or library such as the OWASP ESAPI Authentication feature.

More Improper Authentication vulnerabilities (CWE-287)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Third-party and government advisories

Recent Improper Authentication vulnerabilities

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