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CVE-2026-33366· NVD / CVE Program· CNA jpcert

Missing authentication for critical function vulnerability in BUFFALO Wi-Fi router products may allow an attacker to forcibly reboot the pro

Missing authentication for critical function vulnerability in BUFFALO Wi-Fi router products may allow an attacker to forcibly reboot the product without authentication.

MediumCVSS 6.9 · v4.0—No exploit No fix recorded
Published
Mar 27, 2026
Updated
Jun 17, 2026
EPSS
0.6% · 44th percentile
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Action score

27

Monitor

Low priority for now.

CVSS
27 / 40 · 6.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · jpcert
5.3
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
buffalowcr-1166dhpl firmware
buffalowcr-1166dhpl
buffalowsr3600be4-kh firmware
buffalowsr3600be4-kh
buffalowsr3600be4p firmware
buffalowsr3600be4p
buffalowxr-1750dhp firmware
buffalowxr-1750dhp
buffalowxr-1750dhp2 firmware
buffalowxr-1750dhp2
buffalowxr18000be10p firmware
buffalowxr18000be10p

and 80 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • buffalo fs-m1266 firmwarebefore 4.13
  • buffalo fs-s1266 firmwarebefore 4.13
  • buffalo vr-u300w firmwarebefore 1.42
  • buffalo vr-u500x firmwarebefore 1.42
  • buffalo wapm-1266r firmwarebefore 1.42
  • buffalo wapm-1266wdpr firmwarebefore 1.42
  • buffalo wapm-1266wdpra firmwarebefore 1.42
  • buffalo wapm-1750d firmwarebefore 1.07
  • buffalo wapm-2133r firmwarebefore 1.42
  • buffalo wapm-2133tr firmwarebefore 1.42
  • buffalo wapm-ax4r firmwarebefore 1.42
  • buffalo wapm-ax8r firmwarebefore 1.42
  • buffalo wapm-axetr firmwarebefore 1.42
  • buffalo waps-1266 firmwarebefore 1.42
  • buffalo waps-ax4 firmwarebefore 1.42
  • buffalo wcr-1166dhpl firmwarebefore 1.01
  • buffalo wem-1266 firmwarebefore 2.87
  • buffalo wem-1266wp firmwarebefore 2.87
  • buffalo wrm-d2133hp firmwarebefore 3.01
  • buffalo wrm-d2133hs firmwarebefore 3.01

Versions reported by the vendor

Affected version ranges reported by the assigning authority (jpcert). Independent of NVD's CPE analysis and usually ahead of it.

  • BUFFALO INC. BUFFALO Wi-Fi router products

    • See "References" sectionaffected

Same product

buffalo: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-33280Hidden functionality issue exists in BUFFALO Wi-Fi router products, which may allow an attacker to gain access to the product’s debugging fu
    34Monitor
  • CVE-2026-32669Code injection vulnerability exists in BUFFALO Wi-Fi router products.
    34Monitor
  • CVE-2026-27650OS Command Injection vulnerability exists in BUFFALO Wi-Fi router products.
    34Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

—

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

  • CVE-2026-332800 days apartHidden functionality issue exists in BUFFALO Wi-Fi router products, which may allow an attacker to gain access to the product’s debugging fu
    34Monitor

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-306 · Missing Authentication for Critical Function

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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

nvd-secondary

Root cause

A function added for development or support ships to production without authentication. It often relies on the assumption that it is “only reachable from the internal network.”

The bug in code

The whole CWE-306 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
// Added for the support teamapp.post("/maintenance/reset", resetDevice);

Fixed

ts
if (config.maintenanceEnabled) {  app.post(    "/maintenance/reset",    requireSession, requireRole("admin"), resetDevice  );}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records