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CVE-2026-21634

Quick assessment

Affected
Ubiquiti Inc UniFi Protect Application
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ubiquiti UniFi Protect Application是美国优比快（Ubiquiti）公司的一款安全应用程序。 Ubiquiti UniFi Protect Application 6.1.79及之前版本存在安全漏洞，该漏洞源于发现协议存在缓冲区溢出，可能导致应用程序重启。

CVSS 6.5 · Medium EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-21634

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A malicious actor with access to the adjacent network could overflow the UniFi Protect Application (Version 6.1.79 and earlier) discovery protocol causing it to restart. Affected Products: UniFi Protect Application (Version 6.1.79 and earlier). Mitigation: Update your UniFi Protect Application to Version 6.2.72 or later.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Ubiquiti UniFi Protect Application 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ubiquiti UniFi Protect Application是美国优比快（Ubiquiti）公司的一款安全应用程序。 Ubiquiti UniFi Protect Application 6.1.79及之前版本存在安全漏洞，该漏洞源于发现协议存在缓冲区溢出，可能导致应用程序重启。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Ubiquiti Inc UniFi Protect Application 6.1.79 ~ 6.2.72 -

II. Public POCs for CVE-2026-21634

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III. Intelligence Information for CVE-2026-21634

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Other References for CVE-2026-21634 (1)

Same Patch Batch · Ubiquiti Inc · 2026-01-05 · 4 CVEs total

CVE-2026-21633 8.8 HIGH Ubiquiti UniFi Protect Application 安全漏洞
CVE-2025-59467 7.5 HIGH Ubiquiti UCRM Argentina AFIP invoices Plugin 安全漏洞
CVE-2026-21635 5.3 MEDIUM Ubiquiti EV Station Lite 安全漏洞

IV. Related Vulnerabilities

Same product: UniFi Protect Application
Same vendor: Ubiquiti Inc

V. Comments for CVE-2026-21634

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