CVE-2026-21638

highpriority · track · 0EPSS 0.004 · 36 %ileDEEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.43% (36th) EPSS

CVSS 8.8 · high

Is it mine?

13 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-23

A malicious actor in Wi-Fi range of the affected product could leverage a vulnerability in the airMAX Wireless Protocol to achieve a remote code execution (RCE) within the affected product. Affected Products: UBB-XG (Version 1.2.2 and earlier) UDB-Pro/UDB-Pro-Sector (Version 1.4.1 and earlier) UBB (Version 3.1.5 and earlier) Mitigation: Update your UBB-XG to Version 1.2.3 or later. Update your UDB-Pro/UDB-Pro-Sector to Version 1.4.2 or later. Update your UBB to Version 3.1.7 or later.

cvss

Technical severity, 0–10. One row per scoring source.

8.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.18.8highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.18.8highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · support@hackerone.comexploitability 2.8 · impact 5.9

v3.18.1highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-77US

affected products (13)

Products and version ranges known to be affected.

Ubiquiti UniFi UBB <3.1.7all versionscert_bundDE
Ubiquiti UniFi UBB-XG <1.2.3all versionscert_bundDE
Ubiquiti UniFi UDB-Pro/UDB-Pro-Sector <1.4.2all versionscert_bundDE
Ubiquiti UniFi≤ UBB <3.1.7cert_bundDE
Ubiquiti UniFi≤ UBB-XG <1.2.3cert_bundDE
Ubiquiti UniFi≤ UDB-Pro/UDB-Pro-Sector <1.4.2cert_bundDE
Ubiquiti Inc UBB0 → 3.1.7enisa_euvdEU
Ubiquiti Inc UBB-XG0 → 1.2.3enisa_euvdEU
Ubiquiti Inc UDB-Pro/UDB-Pro-Sector0 → 1.4.2enisa_euvdEU
ui ubb firmware< 3.1.7nvdUScpe:2.3:o:ui:ubb_firmware:*:*:*:*:*:*:*:*
ui ubb-xg firmware< 1.2.3nvdUScpe:2.3:o:ui:ubb-xg_firmware:*:*:*:*:*:*:*:*
ui udb-pro firmware< 1.4.2nvdUScpe:2.3:o:ui:udb-pro_firmware:*:*:*:*:*:*:*:*
ui udb-pro-sector firmware< 1.4.2nvdUScpe:2.3:o:ui:udb-pro-sector_firmware:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-0022Ubiquiti UniFi Building Bridge und Device Bridge: Schwachstelle ermöglicht CodeausführungDeutsch2026-01-06csaf · cert_bundDE
Ein Angreifer aus einem angrenzenden Netzwerk kann eine Schwachstelle in Ubiquiti UniFi Building Bridge- und Device Bridge-Produkten ausnutzen, um beliebigen Programmcode auszuführen.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd NVD CVE.org MITRE

published 2026-01-08modified 2026-06-17

references (4)

External citations — patches, advisories, analysis.

scry

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