Quick answer
Direct answer
Risk scores
| CVSS metric | What it means |
|---|---|
| Attack vector (AV:N) | Network: reachable remotely |
| Attack complexity (AC:L) | Low complexity |
| Attack requirements (AT:N) | No attack requirements |
| Privileges required (PR:H) | High privileges required |
| User interaction (UI:N) | No user interaction |
| Confidentiality (VC:H) | High confidentiality impact |
| Integrity (VI:H) | High integrity impact |
| Availability (VA:H) | High availability impact |
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
About Buffalo Wcr-1166dhpl Firmware
CVE-2026-33280 affects Buffalo Wcr-1166dhpl Firmware, a product from Buffalo. Before acting, confirm where Buffalo Wcr-1166dhpl Firmware runs in your estate, who owns it and whether it is reachable from the internet, because exposure decides real risk more than the score alone.
What the flaw is
In plain terms: Hidden functionality issue exists in BUFFALO Wi-Fi router products, which may allow an attacker to gain access to the product’s debugging functionality, resulting in the execution of arbitrary OS commands.
The weakness class is Hidden Functionality. The product contains an undocumented backdoor feature.
Based on its CVSS vector, the flaw can be reached over the network, needs some level of access, and needs no user interaction. Apply the vendor fix and confirm exposure on internet facing and business critical assets first.
Affected versions and timeline
| Field | Detail |
|---|---|
| Product | Buffalo Wcr-1166dhpl Firmware |
| Affected versions | Wcr-1166dhpl Firmware before 1.01; Wsr3600be4-Kh Firmware before 6.02; Wsr3600be4p Firmware before 5.02; Wxr-1750dhp Firmware before 2.63; Wxr-1750dhp2 Firmware before 2.63; Wxr18000be10p Firmware before 5.03; Wxr-1900dhp Firmware before 2.53; Wxr-1900dhp2 Firmware before 2.62; Wxr-1900dhp3 Firmware before 2.66; Wxr-5950ax12 Firmware before 3.57; Wxr-6000ax12b Firmware before 3.57; Wxr-6000ax12p Firmware before 3.57 |
| Published | Mar 27, 2026 |
| Last modified | Jun 17, 2026 |
| Added to CISA KEV | Not listed |
| Assigning CNA | vultures@jpcert.or.jp |
How to detect it
- Inventory every instance of Buffalo Wcr-1166dhpl Firmware and record the running version against the affected range above.
- Check external attack surface scans for internet facing instances of the component.
- Review logs on affected systems for unusual requests, errors or new processes around the vulnerable function.
- Confirm with an authenticated vulnerability scan once your scanner has a check for this CVE.
How to fix it
- Apply the fixed version of Buffalo Wcr-1166dhpl Firmware named in the vendor advisory.
- If patching must wait, restrict network access to the affected service and put it behind authentication or a web application firewall rule.
- Rescan after the change to prove the exposure is gone, then close the ticket.
CTEM action plan
| CTEM stage | What to do for this CVE |
|---|---|
| Scope | Add every business service that depends on Buffalo Wcr-1166dhpl Firmware to the current CTEM cycle. |
| Discover | Find all instances, including shadow and cloud deployments, and record versions and exposure. |
| Prioritize | Rank using EPSS and CVSS together with asset exposure and business impact. |
| Validate | Confirm the flaw is reachable and exploitable in your environment and that compensating controls work. |
| Mobilize | Assign the fix to the asset owner with a due date matched to the priority, then verify closure. |
CWE References
- CWE-912: Hidden Functionality More CVEs with this weakness
Technical References
Frequently asked questions
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