How severe is CVE-2026-33280?

CVE-2026-33280 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-33280 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33280?

CVE-2026-33280 primarily affects Buffalo Wcr-1166dhpl Firmware. In total, 46 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-33280?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-33280 have an EU (EUVD) identifier?

Yes. CVE-2026-33280 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16549.

When was CVE-2026-33280 published?

CVE-2026-33280 was published on 2026-03-27 and last updated on 2026-06-17.

CVE-2026-33280

CVE-2026-33280 is a critical-severity vulnerability in Buffalo Wcr-1166dhpl Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-912.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 8.6
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-16549
Weakness: CWE-912
Affected product: Buffalo Wcr-1166dhpl Firmware
Published: 2026-03-27
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-33280?: 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.
How severe is CVE-2026-33280?: CVE-2026-33280 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-33280 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33280?: CVE-2026-33280 primarily affects Buffalo Wcr-1166dhpl Firmware. In total, 46 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-33280?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-33280 have an EU (EUVD) identifier?: Yes. CVE-2026-33280 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16549.
When was CVE-2026-33280 published?: CVE-2026-33280 was published on 2026-03-27 and last updated on 2026-06-17.

References

Affected products (46)

cpe:2.3:o:buffalo:wcr-1166dhpl_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wsr3600be4-kh_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wsr3600be4p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wxr-1750dhp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wxr-1750dhp2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wxr18000be10p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wxr-1900dhp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wxr-1900dhp2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wxr-1900dhp3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wxr-5950ax12_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wxr-6000ax12b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wxr-6000ax12p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wxr-6000ax12s_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wzr-1166dhp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wzr-1166dhp2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wzr-1750dhp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wzr-1750dhp2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wzr-s1750dhp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wrm-d2133hp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wrm-d2133hs_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wtr-m2133hp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wtr-m2133hs_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wem-1266_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wem-1266wp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:vr-u300w_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:vr-u500x_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wapm-1266r_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wapm-1266wdpr_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wapm-1266wdpra_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wapm-1750d_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wapm-2133r_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wapm-2133tr_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wapm-ax4r_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wapm-ax8r_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wapm-axetr_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:waps-1266_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:waps-ax4_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:fs-m1266_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:fs-s1266_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:buffalo:wzr-600dhp_firmware:-:*:*:*:*:*:*:*

More vulnerabilities in Buffalo Wcr-1166dhpl Firmware

CVE-2026-32669 — Critical (CVSS 9.8): Code injection vulnerability exists in BUFFALO Wi-Fi router products. If this vulnerability is exploited, an arbitrary…
CVE-2026-27650 — Critical (CVSS 9.8): OS Command Injection vulnerability exists in BUFFALO Wi-Fi router products. If this vulnerability is exploited, an…
CVE-2026-32678 — High (CVSS 7.5): Authentication bypass issue exists in BUFFALO Wi-Fi router products, which may allow an attacker to alter critical…
CVE-2026-33366 — Medium (CVSS 5.3): Missing authentication for critical function vulnerability in BUFFALO Wi-Fi router products may allow an attacker to…

All CVEs affecting Buffalo Wcr-1166dhpl Firmware →

Other CWE-912 vulnerabilities

CVE-2026-3587 — Critical (CVSS 10.0): An unauthenticated remote attacker can exploit a hidden function in the CLI prompt to escape the restricted interface,…
CVE-2024-39754 — Critical (CVSS 10.0): A static login vulnerability exists in the wctrls functionality of Wavlink AC3000 M33A8.V5030.210505. A specially…
CVE-2026-1952 — Critical (CVSS 9.8): Delta Electronics AS320T has denial of service via the undocumented subfunction vulnerability.
CVE-2010-20103 — Critical (CVSS 9.8): A malicious backdoor was embedded in the official ProFTPD 1.3.3c source tarball distributed between November 28 and…
CVE-2024-45697 — Critical (CVSS 9.8): Certain models of D-Link wireless routers have a hidden functionality where the telnet service is enabled when the WAN…
CVE-2024-28011 — Critical (CVSS 9.8): Hidden Functionality vulnerability in NEC Corporation Aterm WG1800HP4, WG1200HS3, WG1900HP2, WG1200HP3, WG1800HP3,…

Browse all CWE-912 vulnerabilities →