CVE-2026-33280: Hidden functionality issue exists in BUFFALO Wi-Fi router products, which may allow an attacker to gain access to the…

Quick answers

Is CVE-2026-33280 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-33280 being exploited in the wild.

How severe is CVE-2026-33280?

Critical severity, with a CVSS score of 9.8, published 27 March 2026.

Which products and versions are affected?

Buffalo Fs-M1266, Buffalo Fs-M1266 Firmware, Buffalo Fs-S1266, Buffalo Fs-S1266 Firmware and 88 more. The advisory does not name versions.

Is there a fix for CVE-2026-33280?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

Am I affected by CVE-2026-33280?

Check whether you run Buffalo Fs-M1266, Buffalo Fs-M1266 Firmware, Buffalo Fs-S1266 or one of the others listed. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

• Buffalo Fs-M1266
• Buffalo Fs-M1266 Firmware
• Buffalo Fs-S1266
• Buffalo Fs-S1266 Firmware
• Buffalo Vr-U300w
• Buffalo Vr-U300w Firmware
• Buffalo Vr-U500x
• Buffalo Vr-U500x Firmware
• Buffalo Wapm-1266r
• Buffalo Wapm-1266r Firmware
• Buffalo Wapm-1266wdpr
• Buffalo Wapm-1266wdpr Firmware
• Buffalo Wapm-1266wdpra
• Buffalo Wapm-1266wdpra Firmware
• Buffalo Wapm-1750d
• Buffalo Wapm-1750d Firmware
• Buffalo Wapm-2133r
• Buffalo Wapm-2133r Firmware
• Buffalo Wapm-2133tr
• Buffalo Wapm-2133tr Firmware
• Buffalo Wapm-Ax4r
• Buffalo Wapm-Ax4r Firmware
• Buffalo Wapm-Ax8r
• Buffalo Wapm-Ax8r Firmware
• Buffalo Wapm-Axetr
• Buffalo Wapm-Axetr Firmware
• Buffalo Waps-1266
• Buffalo Waps-1266 Firmware
• Buffalo Waps-Ax4
• Buffalo Waps-Ax4 Firmware
• Buffalo Wcr-1166dhpl
• Buffalo Wcr-1166dhpl Firmware
• Buffalo Wem-1266
• Buffalo Wem-1266 Firmware
• Buffalo Wem-1266wp
• Buffalo Wem-1266wp Firmware
• Buffalo Wrm-D2133hp
• Buffalo Wrm-D2133hp Firmware
• Buffalo Wrm-D2133hs
• Buffalo Wrm-D2133hs Firmware
• Buffalo Wsr3600be4-Kh
• Buffalo Wsr3600be4-Kh Firmware
• Buffalo Wsr3600be4p
• Buffalo Wsr3600be4p Firmware
• Buffalo Wtr-M2133hp
• Buffalo Wtr-M2133hp Firmware
• Buffalo Wtr-M2133hs
• Buffalo Wtr-M2133hs Firmware
• Buffalo Wxr-1750dhp
• Buffalo Wxr-1750dhp Firmware
• Buffalo Wxr-1750dhp2
• Buffalo Wxr-1750dhp2 Firmware
• Buffalo Wxr-1900dhp
• Buffalo Wxr-1900dhp Firmware
• Buffalo Wxr-1900dhp2
• Buffalo Wxr-1900dhp2 Firmware
• Buffalo Wxr-1900dhp3
• Buffalo Wxr-1900dhp3 Firmware
• Buffalo Wxr-5950ax12
• Buffalo Wxr-5950ax12 Firmware
• Buffalo Wxr-6000ax12b
• Buffalo Wxr-6000ax12b Firmware
• Buffalo Wxr-6000ax12p
• Buffalo Wxr-6000ax12p Firmware
• Buffalo Wxr-6000ax12s
• Buffalo Wxr-6000ax12s Firmware
• Buffalo Wxr18000be10p
• Buffalo Wxr18000be10p Firmware
• Buffalo Wzr-1166dhp
• Buffalo Wzr-1166dhp Firmware
• Buffalo Wzr-1166dhp2
• Buffalo Wzr-1166dhp2 Firmware
• Buffalo Wzr-1750dhp
• Buffalo Wzr-1750dhp Firmware
• Buffalo Wzr-1750dhp2
• Buffalo Wzr-1750dhp2 Firmware
• Buffalo Wzr-600dhp
• Buffalo Wzr-600dhp Firmware
• Buffalo Wzr-600dhp2
• Buffalo Wzr-600dhp2 Firmware
• Buffalo Wzr-600dhp3
• Buffalo Wzr-600dhp3 Firmware
• Buffalo Wzr-900dhp
• Buffalo Wzr-900dhp Firmware
• Buffalo Wzr-900dhp2
• Buffalo Wzr-900dhp2 Firmware
• Buffalo Wzr-S1750dhp
• Buffalo Wzr-S1750dhp Firmware
• Buffalo Wzr-S600dhp
• Buffalo Wzr-S600dhp Firmware
• Buffalo Wzr-S900dhp
• Buffalo Wzr-S900dhp Firmware