CVE-2015-9266: Ubnt AirOS 4 XS2

Critical severity, CVSS 9.8. EPSS: 74% chance of exploitation in the next 30 days.

The web management interface of Ubiquiti airMAX, airFiber, airGateway and EdgeSwitch XP (formerly TOUGHSwitch) allows an unauthenticated attacker to upload and write arbitrary files using directory traversal techniques. An attacker can exploit this vulnerability to gain root privileges. This vulnerability is fixed in the following product versions (fixes released in July 2015, all prior versions are affected): airMAX AC 7.1.3; airMAX M (and airRouter) 5.6.2 XM/XW/TI, 5.5.11 XM/TI, and 5.5.10u2 XW; airGateway 1.1.5; airFiber AF24/AF24HD 2.2.1, AF5x 3.0.2.1, and AF5 2.2.1; airOS 4 XS2/XS5 4.0.4; and EdgeSwitch XP (formerly TOUGHSwitch) 1.3.2.

Affected products

• Ubnt AirOS 4 XS2: before 4.0.4 (fixed in 4.0.4)
• Ubnt AirOS 4 XS5: before 4.0.4 (fixed in 4.0.4)
• Ubnt Edgeswitch XP Firmware: before 1.3.2 (fixed in 1.3.2)
• UI AF5 Firmware: before 2.2.1 (fixed in 2.2.1)
• UI AF5X Firmware: before 3.0.2.1 (fixed in 3.0.2.1)
• UI Airfiber AF24 Firmware: before 2.2.1 (fixed in 2.2.1)
• UI Airfiber AF24HD Firmware: before 2.2.1 (fixed in 2.2.1)
• UI Airgateway Firmware: before 1.15 (fixed in 1.15)
• UI Airmax Ac Firmware: version 7.1.3 only
• UI Airmax M Ti Firmware: before 5.6.2 (fixed in 5.6.2)
• UI Airmax M Xm Firmware: before 5.6.2 (fixed in 5.6.2)
• UI Airmax M Xw Firmware: before 5.6.2 (fixed in 5.6.2)

Published 2018-09-05. Last modified 2026-06-17.