PT-2026-1309 · Ubiquiti · Unifi Protect Application

Michele + 1 · CVE-2026-21634 · Published 2026-01-05 · Updated 2026-02-25

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions UniFi Protect Application versions 6.1.79 and earlier

Description A malicious actor with access to the adjacent network could cause the UniFi Protect Application discovery protocol to overflow, leading to a restart of the application.

Recommendations Update your UniFi Protect Application to version 6.2.72 or later.

Fix

DoS

Buffer Overflow

Weakness Enumeration

CWE-119

Related Identifiers

CVE-2026-21634

ZDI-26-128

Affected Products

Unifi Protect Application

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-21634 · Security Note
• https://osv.dev/vulnerability/CVE-2026-21634 · Vendor Advisory
• https://zerodayinitiative.com/advisories/ZDI-26-128 · Security Note
• https://community.ui.com/releases/Security-Advisory-Bulletin-058-058/6922ff20-8cd7-4724-8d8c-676458a2d0f9 · Vendor Advisory
• https://t.me/CVEtracker/41405 · Telegram Post
• https://runzero.com/blog/ubiquiti-unifi-protect · Reddit Post
• https://twitter.com/CVEnew/status/2008227020249985110 · Twitter Post
• https://twitter.com/TheZDIBugs/status/2026721281802973198 · Twitter Post
• https://t.me/cveNotify/150350 · Telegram Post