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CVE-2026-77549

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.

Ubiquiti UniFi OS Server是美国Ubiquiti公司的一款集成网络管理系统的服务器设备。 Ubiquiti UniFi OS Server 5.1.37之前版本存在输入验证错误漏洞，该漏洞源于对CRLF序列中和不当，可能导致具有网络访问权限的恶意攻击者在特定条件下绕过身份验证。

CVSS 9.0 · Critical EPSS 0.51% · P42

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

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-2026-77549

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 network and under certain conditions 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:H/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
Vulnerability Title
Ubiquiti UniFi OS Server 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ubiquiti UniFi OS Server是美国Ubiquiti公司的一款集成网络管理系统的服务器设备。 Ubiquiti UniFi OS Server 5.1.37之前版本存在输入验证错误漏洞，该漏洞源于对CRLF序列中和不当，可能导致具有网络访问权限的恶意攻击者在特定条件下绕过身份验证。
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 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-2026-77549

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III. Intelligence Information for CVE-2026-77549

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Other References for CVE-2026-77549 (1)

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

CVE-2026-77554 10.0 CRITICAL Ubiquiti UniFi Talk Application 输入验证错误漏洞
CVE-2026-77537 10.0 CRITICAL Ubiquiti UniFi Protect Application 输入验证错误漏洞
CVE-2026-77550 10.0 CRITICAL Ubiquiti UniFi OS Server 输入验证错误漏洞
CVE-2026-77534 9.9 CRITICAL Ubiquiti UniFi OS Server 权限许可和访问控制问题漏洞
CVE-2026-77536 9.9 CRITICAL Ubiquiti UniFi OS Server 权限许可和访问控制问题漏洞
CVE-2026-77553 9.9 CRITICAL Ubiquiti UniFi Access Application 权限许可和访问控制问题漏洞
CVE-2026-77543 9.9 CRITICAL Ubiquiti UniFi Access Application 输入验证错误漏洞
CVE-2026-77546 9.9 CRITICAL Ubiquiti UniFi Access Application 输入验证错误漏洞
CVE-2026-77533 9.9 CRITICAL Ubiquiti UniFi Protect Application 输入验证错误漏洞
CVE-2026-77548 9.9 CRITICAL Ubiquiti UniFi Protect Application 输入验证错误漏洞
CVE-2026-77547 9.9 CRITICAL Ubiquiti UniFi Access Application 输入验证错误漏洞
CVE-2026-77557 9.8 CRITICAL Ubiquiti UniFi Protect AI Key 权限许可和访问控制问题漏洞
CVE-2026-77552 9.8 CRITICAL Ubiquiti UniFi Enterprise Audio/Video Bridge 输入验证错误漏洞
CVE-2026-77542 9.1 CRITICAL Ubiquiti UID Enterprise Agent 输入验证错误漏洞
CVE-2026-77541 9.1 CRITICAL Ubiquiti UniFi Access Application 权限许可和访问控制问题漏洞
CVE-2026-77539 9.1 CRITICAL Ubiquiti UniFi OS Server 输入验证错误漏洞
CVE-2026-77535 9.1 CRITICAL Ubiquiti UniFi Network Application 输入验证错误漏洞
CVE-2026-77540 9.1 CRITICAL Ubiquiti UniFi OS Server 输入验证错误漏洞
CVE-2026-77545 9.0 CRITICAL Ubiquiti UniFi OS Server 调试信息泄露漏洞
CVE-2026-77551 9.0 CRITICAL Ubiquiti UniFi Connect Display Cast Pro 权限许可和访问控制问题漏洞

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-2026-77549

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