How severe is CVE-2022-40966?

CVE-2022-40966 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2022-40966 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-40966?

CVE-2022-40966 primarily affects Buffalo Wcr-300 Firmware. In total, 75 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2022-40966?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2022-40966 published?

CVE-2022-40966 was published on 2022-12-07 and last updated on 2026-06-17.

CVE-2022-40966

CVE-2022-40966 is a high-severity vulnerability in Buffalo Wcr-300 Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (26th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Buffalo Wcr-300 Firmware
Published: 2022-12-07
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2022-40966?: 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.
How severe is CVE-2022-40966?: CVE-2022-40966 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2022-40966 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-40966?: CVE-2022-40966 primarily affects Buffalo Wcr-300 Firmware. In total, 75 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2022-40966?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2022-40966 published?: CVE-2022-40966 was published on 2022-12-07 and last updated on 2026-06-17.

References

Affected products (75)

cpe:2.3:o:buffalo:wcr-300_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:whr-hp-g300n_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:whr-hp-gn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wpl-05g300_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wrm-d2133hp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wrm-d2133hs_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wtr-m2133hp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wtr-m2133hs_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wxr-1900dhp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wxr-1900dhp2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wxr-1900dhp3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wxr-5950ax12_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wxr-6000ax12b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wxr-6000ax12s_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wzr-300hp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wzr-450hp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wzr-600dhp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wzr-900dhp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wzr-1750dhp2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wzr-hp-ag300h_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wzr-hp-g302h_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wem-1266_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wem-1266wp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wlae-ag300n_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:fs-600dhp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:fs-g300n_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:fs-hp-g300n_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:fs-r600dhp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:bhr-4grv_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:dwr-hp-g300nh_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:dwr-pg_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:hw-450hp-zwe_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wer-a54g54_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wer-ag54_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wer-am54g54_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wer-amg54_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:whr-300_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:whr-300hp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:whr-am54g54_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:whr-amg54_firmware:*:*:*:*:*:*:*:*

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