CVE-2026-77549
CriticalCVSS 9.0Exploitation Probability (EPSS)
Low risk22th percentile - higher than 22% of all known CVEs
Summary
An attacker with network access and under certain conditions could exploit an Improper Neutralization of CRLF Sequences vulnerability in certain devices running UniFi OS to bypass authentication to such UniFi OS devices or instances.
Risk Assessment
Authentication bypass could allow the attacker unauthorized access to devices, potentially leading to compromise of the entire infrastructure.
Recommendation
It is recommended to apply vendor patches immediately and implement additional authentication mechanisms such as MFA.
Other vulnerabilities in UniFi OS
See all- CVE-2026-77550Critical
An attacker with network access could exploit an Improper Neutralization of CRLF Sequences vulnerability in certain devices running UniFi OS to bypass authentication to such UniFi OS devices or instances.
- CVE-2026-77545Critical
An attacker with network access, low privileges, and under certain conditions can exploit an active debug code vulnerability in devices running UniFi OS to escalate privileges within those devices or instances.
- CVE-2026-77536Critical
An attacker with network access and low privileges could exploit an Improper Access Control vulnerability in devices running UniFi OS to escalate privileges within such devices or instances.
- CVE-2026-77534Critical
An attacker with network access and low privileges could exploit an Improper Access Control vulnerability in devices running UniFi OS to escalate privileges within such devices or instances.
- CVE-2026-55116Critical
A vulnerability in UniFi OS allows unauthorized changes to devices by an attacker with network access under certain network configurations.
- CVE-2026-54402Critical
A vulnerability in UniFi OS allows an attacker with network access and low privileges to execute command injection on the host device due to improper input validation.
- CVE-2026-47370Critical
Certain devices running UniFi OS are vulnerable to improper input validation, allowing a malicious actor with low privileges to execute a Command Injection attack.
- CVE-2026-47369Critical
A vulnerability related to improper input validation exists in devices running UniFi OS, which could be exploited by a malicious actor with low privileges to escalate privileges.
- CVE-2026-34910CriticalActively exploited
Command Injection vulnerability in UniFi OS devices. Improper input validation allows an attacker with network access to execute arbitrary system commands.
- CVE-2026-34909CriticalActively exploited
Path Traversal vulnerability in UniFi OS devices. An attacker with network access can read system files and potentially gain access to a user account.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS