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CVE-2026-27650

Buffalo Fs-m1266 Firmware command injection

9.8 CRITICALEPSS 1.45%
  1. Published27 Mar 2026

Description

OS Command Injection vulnerability exists in BUFFALO Wi-Fi router products. If this vulnerability is exploited, an arbitrary OS command may be executed on the products.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Buffalo Fs-m1266 Firmware< 4.13
Buffalo Fs-s1266 Firmware< 4.13
Buffalo Vr-u300w Firmware< 1.42
Buffalo Vr-u500x Firmware< 1.42
Buffalo Wapm-1266r Firmware< 1.42
Buffalo Wapm-1266wdpra Firmware< 1.42
Buffalo Wapm-1266wdpr Firmware< 1.42
Buffalo Wapm-1750d Firmware< 1.07
Buffalo Wapm-2133r Firmware< 1.42
Buffalo Wapm-2133tr Firmware< 1.42
Buffalo Wapm-ax4r Firmware< 1.42
Buffalo Wapm-ax8r Firmware< 1.42
Buffalo Wapm-axetr Firmware< 1.42
Buffalo Waps-1266 Firmware< 1.42
Buffalo Waps-ax4 Firmware< 1.42
Buffalo Wcr-1166dhpl Firmware< 1.01
Buffalo Wem-1266 Firmware< 2.87
Buffalo Wem-1266wp Firmware< 2.87
Buffalo Wrm-d2133hp Firmware< 3.01
Buffalo Wrm-d2133hs Firmware< 3.01
Buffalo Wsr3600be4-kh Firmware< 6.02
Buffalo Wsr3600be4p Firmware< 5.02
Buffalo Wtr-m2133hp Firmware< 3.01
Buffalo Wtr-m2133hs Firmware< 3.01

Remediation

Fixed in
Buffalo Fs-m1266 Firmware≥ 4.13
Buffalo Fs-s1266 Firmware≥ 4.13
Buffalo Vr-u300w Firmware≥ 1.42
Buffalo Vr-u500x Firmware≥ 1.42
Buffalo Wapm-1266r Firmware≥ 1.42
Buffalo Wapm-1266wdpra Firmware≥ 1.42
Buffalo Wapm-1266wdpr Firmware≥ 1.42
Buffalo Wapm-1750d Firmware≥ 1.07
Buffalo Wapm-2133r Firmware≥ 1.42
Buffalo Wapm-2133tr Firmware≥ 1.42

References

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Frequently asked

Is CVE-2026-27650 being actively exploited?

CVE-2026-27650 is not in the CISA KEV catalog. Its EPSS exploit probability is 1.45%.

How severe is CVE-2026-27650?

CVE-2026-27650 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 1.45% probability of exploitation.

Which products are affected by CVE-2026-27650?

Affected products include Buffalo Fs-m1266 Firmware, Buffalo Fs-s1266 Firmware, Buffalo Vr-u300w Firmware, Buffalo Vr-u500x Firmware, Buffalo Wapm-1266r Firmware, and 19 more.

How do I fix CVE-2026-27650?

Upgrade affected software to a fixed version, for example Buffalo Fs-m1266 Firmware 4.13, Buffalo Fs-s1266 Firmware 4.13, Buffalo Vr-u300w Firmware 1.42 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-27650 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.