Buffer overflow in UniFi Protect Application - CVE-2026-21634
Published: February 27, 2026
Vulnerability identifier: #VU123326
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-21634
CWE-ID: CWE-119
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error within the parsing of WebSocket headers. A remote attacker on the local network can trigger memory corruption and cause a denial of service condition on the target system.
Affected software
UniFi Protect Application
How to mitigate CVE-2026-21634
Install updates from vendor's website.
UniFi Protect Application - update to 6.2.72