CVE-2026-77550 - Vulnerability Details - OpenCVE

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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable yes

Technical Impact total

No data.

No data.

No data.

References

Link	Providers
https://community.ui.com/releases/Security-Advisory-Bulletin-067/fc4a3488-7c43-4628-8bab-f715e96dbfc9

History

Wed, 26 Aug 2026 13:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Wed, 26 Aug 2026 12:45:00 +0000

Type	Values Removed	Values Added
Title		UniFi OS Authentication Bypass via CRLF Injection

Wed, 26 Aug 2026 11:00:00 +0000

Type	Values Removed	Values Added
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.
Weaknesses		CWE-93
References		https://community.ui.com/releases/Security-Advisory-Bulletin-067/fc4a3488-7c43-4628-8bab-f715e96dbfc9
Metrics		cvssV3_1 `{'score': 10, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'}`

MITRE

Status: PUBLISHED

Assigner: Ubiquiti

Published: 2026-08-26T10:33:29.989Z

Updated: 2026-08-27T03:56:41.054Z

Reserved: 2026-08-20T20:32:37.794Z

Link: CVE-2026-77550

Vulnrichment

Updated: 2026-08-26T12:50:46.954Z

NVD

Status : Deferred

Published: 2026-08-26T11:16:38.930

Modified: 2026-08-28T18:49:15.340

Link: CVE-2026-77550

Redhat

No data.

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-77550", "assignerOrgId": "fe490ce8-0395-4072-90d8-2707e1bdf984", "state": "PUBLISHED", "assignerShortName": "Ubiquiti", "dateReserved": "2026-08-20T20:32:37.794Z", "datePublished": "2026-08-26T10:33:29.989Z", "dateUpdated": "2026-08-27T03:56:41.054Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "fe490ce8-0395-4072-90d8-2707e1bdf984", "shortName": "Ubiquiti", "dateUpdated": "2026-08-26T10:33:29.989Z"}, "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-93", "description": "CWE-93 Improper neutralization of CRLF sequences ('CRLF injection')", "type": "CWE"}]}], "affected": [{"vendor": "Ubiquiti Inc", "product": "UniFi OS Server", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.37", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Cloud Keys", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.31", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Network Video Recorders", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.31", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Enterprise Network Video Recorders", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.31", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Enterprise Network Attached Storage", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.31", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Dream Machines", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.31", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Enterprise Firewall Core", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.31", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Dream Routers", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.31", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Enterprise Fortress Gateway", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.31", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Cloud Gateways", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.31", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Dream Wall", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.31", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Express 7", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.31", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Network Attached Storage", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.32", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Express", "versions": [{"status": "affected", "version": "0", "lessThan": "4.0.17", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "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.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "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."}]}], "references": [{"url": "https://community.ui.com/releases/Security-Advisory-Bulletin-067/fc4a3488-7c43-4628-8bab-f715e96dbfc9"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseSeverity": "CRITICAL", "baseScore": 10, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"}}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-26T00:00:00+00:00", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3", "id": "CVE-2026-77550"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-27T03:56:41.054Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-77550", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-08-26T12:50:43.001523Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-26T12:50:46.954Z"}}], "cna": {"source": {"discovery": "UNKNOWN"}, "metrics": [{"format": "CVSS", "cvssV3_1": {"scope": "CHANGED", "version": "3.1", "baseScore": 10, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "Ubiquiti Inc", "product": "UniFi OS Server", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.37", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Cloud Keys", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.31", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Network Video Recorders", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.31", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Enterprise Network Video Recorders", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.31", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Enterprise Network Attached Storage", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.31", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Dream Machines", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.31", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Enterprise Firewall Core", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.31", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Dream Routers", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.31", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Enterprise Fortress Gateway", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.31", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Cloud Gateways", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.31", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Dream Wall", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.31", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Express 7", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.31", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Network Attached Storage", "versions": [{"status": "affected", "version": "0", "lessThan": "5.1.32", "versionType": "semver"}], "defaultStatus": "unaffected"}, {"vendor": "Ubiquiti Inc", "product": "Express", "versions": [{"status": "affected", "version": "0", "lessThan": "4.0.17", "versionType": "semver"}], "defaultStatus": "unaffected"}], "references": [{"url": "https://community.ui.com/releases/Security-Advisory-Bulletin-067/fc4a3488-7c43-4628-8bab-f715e96dbfc9"}], "x_generator": {"engine": "Vulnogram 1.0.5"}, "descriptions": [{"lang": "en", "value": "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.", "supportingMedia": [{"type": "text/html", "value": "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.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-93", "description": "CWE-93 Improper neutralization of CRLF sequences ('CRLF injection')"}]}], "providerMetadata": {"orgId": "fe490ce8-0395-4072-90d8-2707e1bdf984", "shortName": "Ubiquiti", "dateUpdated": "2026-08-26T10:33:29.989Z"}}}, "cveMetadata": {"cveId": "CVE-2026-77550", "state": "PUBLISHED", "dateUpdated": "2026-08-26T12:50:51.261Z", "dateReserved": "2026-08-20T20:32:37.794Z", "assignerOrgId": "fe490ce8-0395-4072-90d8-2707e1bdf984", "datePublished": "2026-08-26T10:33:29.989Z", "assignerShortName": "Ubiquiti"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "UniFi OS Server", "vendor": "Ubiquiti Inc", "versions": [{"lessThan": "5.1.37", "status": "affected", "version": "0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "Cloud Keys", "vendor": "Ubiquiti Inc", "versions": [{"lessThan": "5.1.31", "status": "affected", "version": "0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "Network Video Recorders", "vendor": "Ubiquiti Inc", "versions": [{"lessThan": "5.1.31", "status": "affected", "version": "0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "Enterprise Network Video Recorders", "vendor": "Ubiquiti Inc", "versions": [{"lessThan": "5.1.31", "status": "affected", "version": "0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "Enterprise Network Attached Storage", "vendor": "Ubiquiti Inc", "versions": [{"lessThan": "5.1.31", "status": "affected", "version": "0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "Dream Machines", "vendor": "Ubiquiti Inc", "versions": [{"lessThan": "5.1.31", "status": "affected", "version": "0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "Enterprise Firewall Core", "vendor": "Ubiquiti Inc", "versions": [{"lessThan": "5.1.31", "status": "affected", "version": "0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "Dream Routers", "vendor": "Ubiquiti Inc", "versions": [{"lessThan": "5.1.31", "status": "affected", "version": "0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "Enterprise Fortress Gateway", "vendor": "Ubiquiti Inc", "versions": [{"lessThan": "5.1.31", "status": "affected", "version": "0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "Cloud Gateways", "vendor": "Ubiquiti Inc", "versions": [{"lessThan": "5.1.31", "status": "affected", "version": "0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "Dream Wall", "vendor": "Ubiquiti Inc", "versions": [{"lessThan": "5.1.31", "status": "affected", "version": "0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "Express 7", "vendor": "Ubiquiti Inc", "versions": [{"lessThan": "5.1.31", "status": "affected", "version": "0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "Network Attached Storage", "vendor": "Ubiquiti Inc", "versions": [{"lessThan": "5.1.32", "status": "affected", "version": "0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "Express", "vendor": "Ubiquiti Inc", "versions": [{"lessThan": "4.0.17", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "fe490ce8-0395-4072-90d8-2707e1bdf984"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-77550", "lastModified": "2026-08-28T18:49:15.340", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 10.0, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 6.0, "source": "fe490ce8-0395-4072-90d8-2707e1bdf984", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-77550", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-08-26T00:00:00+00:00", "version": "2.0.3"}}]}, "published": "2026-08-26T11:16:38.930", "references": [{"source": "fe490ce8-0395-4072-90d8-2707e1bdf984", "url": "https://community.ui.com/releases/Security-Advisory-Bulletin-067/fc4a3488-7c43-4628-8bab-f715e96dbfc9"}], "sourceIdentifier": "fe490ce8-0395-4072-90d8-2707e1bdf984", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-93"}], "source": "fe490ce8-0395-4072-90d8-2707e1bdf984", "type": "Secondary"}]}