CVE-2026-77549
No known exploitation. EPSS puts it in the 43rd percentile. Fixed versions are out.
What to do
Find your product and version, then upgrade to the build on the right.
- Ubiquiti Inc UniFi OS ServerAffected: < 5.1.37Upgrade to: 5.1.37Stated by: CVE record
- Ubiquiti Inc Cloud KeysAffected: < 5.1.31Upgrade to: 5.1.31Stated by: CVE record
- Ubiquiti Inc Network Video RecordersAffected: < 5.1.31Upgrade to: 5.1.31Stated by: CVE record
- Ubiquiti Inc Enterprise Network Video RecordersAffected: < 5.1.31Upgrade to: 5.1.31Stated by: CVE record
- Ubiquiti Inc Enterprise Network Attached StorageAffected: < 5.1.31Upgrade to: 5.1.31Stated by: CVE record
Versions as the sources state them. 9 more products have version data. Full version matrix after sign-in
What it is
From the CVE record
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.
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Not in the catalog. CISA has not confirmed exploitation.
- Public exploits
No public exploit or proof of concept found in the sources we track.
- EPSS
0.5% chance of exploitation activity in the next 30 days, which ranks it in the 43rd percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
Lifecycle
6 events over 3 days, from the signal feeds we watch.
- OpenVAS check added
- Record updated
- Record updated
- Publishedweakness classified, record updated
Affected products
- UniFi OS ServerNetworking Infrastructure
- Cloud KeysNetworking Infrastructure / network-management
- Network Video RecordersNetworking Infrastructure / network-management
- Enterprise Network Video RecordersNetworking Infrastructure / network-management
- Enterprise Network Attached StorageNetworking Infrastructure / network-management
- Dream MachinesNetworking Infrastructure / network-management
- Enterprise Firewall CoreNetworking Infrastructure / network-management
- Dream RoutersNetworking Infrastructure / network-management
And 6 more affected products. See all after sign-in
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Scored 9.0 by NVD.
How it is reached
- Attack Vector NetworkExploitable remotely over the network without any special conditions
- Attack Complexity HighRequires specific conditions like a race condition or non-default configuration
- Privileges Required NoneNo authentication required — anyone can exploit this
- User Interaction NoneNo user interaction needed — fully automated exploitation
Scope
- Scope ChangedThe exploit can affect other components (e.g. sandbox escape, host compromise from VM)
Impact if exploited
- Confidentiality HighTotal information disclosure — all data in the component is compromised
- Integrity HighTotal loss of integrity — attacker can modify any data in the component
- Availability HighTotal denial of service — the component is completely unavailable
Weaknesses
Sources
References in the record
Watch the software you run.
My Stack ranks new CVEs for your products by real-world exploitation, so the next serious one reaches you without reading every advisory.
We'll flag the next CVE, public exploit or patch for UniFi OS Server, not every advisory.
A free account adds
- The full version matrix and every affected product
- Exploit links, proofs of concept and Metasploit modules
- Email alerts for the products you watch
- The same data over REST API, MCP and CLI