No exploitation reportedFix available

CVE-2026-27650

Q: Is CVE-2026-27650 actively exploited?

Active exploitation of CVE-2026-27650 has not been confirmed. Its EPSS score was 1.4% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2026-27650?

CVE-2026-27650 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2026-03-27
Fixed in4.13
WeaknessCWE-78

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2026-03-2706:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-27650?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-27650?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Buffalo fs-m1266 firmwareversion to verify

Branch	Affected	Fixed in	Source
4.13	< 4.13	4.13	NVD

Buffalo fs-s1266 firmwareversion to verify

Branch	Affected	Fixed in	Source
4.13	< 4.13	4.13	NVD

Buffalo vr-u300w firmwareversion to verify

Branch	Affected	Fixed in	Source
1.42	< 1.42	1.42	NVD

43 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Buffalo fs-m1266 firmware to 4.13

Advisories and patches

www.buffalo.jpVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2026-03-27
OpenCVESSVC decisionnone—
CNACVSS 4.08.6read 2026-10-23
NVDCVSS 3.19.8read 2026-10-23
CNACVSS 3.08.8read 2026-10-23
CNAweakness (CWE)CWE-78read 2026-10-23
FIRST EPSSEPSS score1.4 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 4.0 vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/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
Published: 2026-03-27
Last Modified: 2026-06-17
NVD status: Analyzed

Frequently asked questions

What is CVE-2026-27650?

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.

Is CVE-2026-27650 actively exploited?

Active exploitation of CVE-2026-27650 has not been confirmed. Its EPSS score was 1.4% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-27650?

CVE-2026-27650 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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