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CVE-2026-77550

Quick assessment

Affected
Ubiquiti Inc UniFi OS Server
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.

具有网络访问权限的攻击者，可利用在运行 UniFi OS 的某些设备中发现的“CRLF 序列处理不当”（Improper Neutralization of CRLF Sequences）漏洞，绕过此类 UniFi OS 设备或实例的认证机制。

CVSS 10.0 · Critical

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 14

VendorProduct Version RangeStatus
Ubiquiti Inc Cloud Gateways < 5.1.31 affected
Ubiquiti Inc Cloud Keys < 5.1.31 affected
Ubiquiti Inc Dream Machines < 5.1.31 affected
Ubiquiti Inc Dream Routers < 5.1.31 affected
Ubiquiti Inc Dream Wall < 5.1.31 affected
Ubiquiti Inc Enterprise Firewall Core < 5.1.31 affected
Ubiquiti Inc Enterprise Fortress Gateway < 5.1.31 affected
Ubiquiti Inc Enterprise Network Attached Storage < 5.1.31 affected
Ubiquiti Inc Enterprise Network Video Recorders < 5.1.31 affected
Ubiquiti Inc Express < 4.0.17 affected
Ubiquiti Inc Express 7 < 5.1.31 affected
Ubiquiti Inc Network Attached Storage < 5.1.32 affected
Ubiquiti Inc Network Video Recorders < 5.1.31 affected
Ubiquiti Inc UniFi OS Server < 5.1.37 affected
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I. Basic Information for CVE-2026-77550

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A malicious actor with access to the network could exploit an Improper Neutralization of CRLF Sequences vulnerability found in certain devices running UniFi OS to bypass authentication to such UniFi OS devices or instances.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Ubiquiti Inc UniFi OS Server 0 ~ 5.1.37 -
Ubiquiti Inc Cloud Keys 0 ~ 5.1.31 -
Ubiquiti Inc Network Video Recorders 0 ~ 5.1.31 -
Ubiquiti Inc Enterprise Network Video Recorders 0 ~ 5.1.31 -
Ubiquiti Inc Enterprise Network Attached Storage 0 ~ 5.1.31 -
Ubiquiti Inc Dream Machines 0 ~ 5.1.31 -
Ubiquiti Inc Enterprise Firewall Core 0 ~ 5.1.31 -
Ubiquiti Inc Dream Routers 0 ~ 5.1.31 -
Ubiquiti Inc Enterprise Fortress Gateway 0 ~ 5.1.31 -
Ubiquiti Inc Cloud Gateways 0 ~ 5.1.31 -
Ubiquiti Inc Dream Wall 0 ~ 5.1.31 -
Ubiquiti Inc Express 7 0 ~ 5.1.31 -
Ubiquiti Inc Network Attached Storage 0 ~ 5.1.32 -
Ubiquiti Inc Express 0 ~ 4.0.17 -

II. Public POCs for CVE-2026-77550

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III. Intelligence Information for CVE-2026-77550

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Other References for CVE-2026-77550 (1)

Same Patch Batch · Ubiquiti Inc · 2026-08-26 · 23 CVEs total

CVE-2026-77537 10.0 CRITICAL UniFi Protect命令注入漏洞
CVE-2026-77554 10.0 CRITICAL UniFi Talk命令注入漏洞
CVE-2026-77534 9.9 CRITICAL UniFi OS 设备权限提升漏洞
CVE-2026-77533 9.9 CRITICAL UniFi Protect命令注入漏洞
CVE-2026-77536 9.9 CRITICAL UniFi OS 设备权限提升漏洞
CVE-2026-77553 9.9 CRITICAL UniFi Access Application权限提升漏洞
CVE-2026-77543 9.9 CRITICAL UniFi Access Application 命令注入漏洞
CVE-2026-77546 9.9 CRITICAL UniFi Access应用命令注入漏洞
CVE-2026-77547 9.9 CRITICAL UniFi Access 命令注入漏洞
CVE-2026-77548 9.9 CRITICAL UniFi Protect命令注入漏洞
CVE-2026-77557 9.8 CRITICAL UniFi Protect AI Key 1.x 权限提升漏洞
CVE-2026-77552 9.8 CRITICAL UniFi Audio/Video Bridge命令注入漏洞
CVE-2026-77532 9.6 CRITICAL EdgeMAX EdgeSwitch DHCPv6缓冲区溢出致远程代码执行
CVE-2026-77542 9.1 CRITICAL UID Enterprise Agent命令注入漏洞
CVE-2026-77541 9.1 CRITICAL UniFi Network Application越权漏洞
CVE-2026-77539 9.1 CRITICAL UniFi OS Server 命令注入漏洞
CVE-2026-77535 9.1 CRITICAL UniFi Network命令注入漏洞
CVE-2026-77540 9.1 CRITICAL UniFi OS Server命令注入漏洞
CVE-2026-77545 9.0 CRITICAL UniFi OS特权提升漏洞
CVE-2026-77549 9.0 CRITICAL UniFi OS CRLF注入致认证绕过漏洞

Showing top 20 of 23 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: UniFi OS Server
Same vendor: Ubiquiti Inc
Same weakness: CWE-93

V. Comments for CVE-2026-77550

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