{"api_version":"1","generated_at":"2026-08-28T00:32:10+00:00","cve":"CVE-2026-77550","urls":{"html":"https://cve.report/CVE-2026-77550","api":"https://cve.report/api/cve/CVE-2026-77550.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-77550","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-77550"},"summary":{"title":"CVE-2026-77550","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.","state":"PUBLISHED","assigner":"Ubiquiti","published_at":"2026-08-26 11:16:38","updated_at":"2026-08-27 04:16:50"},"problem_types":["CWE-93","CWE-93 CWE-93 Improper neutralization of CRLF sequences ('CRLF injection')"],"metrics":[{"version":"3.1","source":"fe490ce8-0395-4072-90d8-2707e1bdf984","type":"Secondary","score":"10","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","baseScore":10,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"CVSS","score":"10","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","data":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":10,"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"}}],"references":[{"url":"https://community.ui.com/releases/Security-Advisory-Bulletin-067/fc4a3488-7c43-4628-8bab-f715e96dbfc9","name":"https://community.ui.com/releases/Security-Advisory-Bulletin-067/fc4a3488-7c43-4628-8bab-f715e96dbfc9","refsource":"fe490ce8-0395-4072-90d8-2707e1bdf984","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-77550","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77550","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Ubiquiti Inc","product":"UniFi OS Server","version":"affected 5.1.37 semver","platforms":[]},{"source":"CNA","vendor":"Ubiquiti Inc","product":"Cloud Keys","version":"affected 5.1.31 semver","platforms":[]},{"source":"CNA","vendor":"Ubiquiti Inc","product":"Network Video Recorders","version":"affected 5.1.31 semver","platforms":[]},{"source":"CNA","vendor":"Ubiquiti Inc","product":"Enterprise Network Video Recorders","version":"affected 5.1.31 semver","platforms":[]},{"source":"CNA","vendor":"Ubiquiti Inc","product":"Enterprise Network Attached Storage","version":"affected 5.1.31 semver","platforms":[]},{"source":"CNA","vendor":"Ubiquiti Inc","product":"Dream Machines","version":"affected 5.1.31 semver","platforms":[]},{"source":"CNA","vendor":"Ubiquiti Inc","product":"Enterprise Firewall Core","version":"affected 5.1.31 semver","platforms":[]},{"source":"CNA","vendor":"Ubiquiti Inc","product":"Dream Routers","version":"affected 5.1.31 semver","platforms":[]},{"source":"CNA","vendor":"Ubiquiti Inc","product":"Enterprise Fortress Gateway","version":"affected 5.1.31 semver","platforms":[]},{"source":"CNA","vendor":"Ubiquiti Inc","product":"Cloud Gateways","version":"affected 5.1.31 semver","platforms":[]},{"source":"CNA","vendor":"Ubiquiti Inc","product":"Dream Wall","version":"affected 5.1.31 semver","platforms":[]},{"source":"CNA","vendor":"Ubiquiti Inc","product":"Express 7","version":"affected 5.1.31 semver","platforms":[]},{"source":"CNA","vendor":"Ubiquiti Inc","product":"Network Attached Storage","version":"affected 5.1.32 semver","platforms":[]},{"source":"CNA","vendor":"Ubiquiti Inc","product":"Express","version":"affected 4.0.17 semver","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"77550","cve":"CVE-2026-77550","epss":"0.004280000","percentile":"0.355600000","score_date":"2026-08-27","updated_at":"2026-08-28 00:03:39"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2026-77550","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","timestamp":"2026-08-26T00:00:00+00:00","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-08-27T03:56:41.054Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"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"}]}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"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."}],"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."}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":10,"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"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-93","description":"CWE-93 Improper neutralization of CRLF sequences ('CRLF injection')","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-08-26T10:33:29.989Z","orgId":"fe490ce8-0395-4072-90d8-2707e1bdf984","shortName":"Ubiquiti"},"references":[{"url":"https://community.ui.com/releases/Security-Advisory-Bulletin-067/fc4a3488-7c43-4628-8bab-f715e96dbfc9"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.5"}}},"cveMetadata":{"assignerOrgId":"fe490ce8-0395-4072-90d8-2707e1bdf984","assignerShortName":"Ubiquiti","cveId":"CVE-2026-77550","datePublished":"2026-08-26T10:33:29.989Z","dateReserved":"2026-08-20T20:32:37.794Z","dateUpdated":"2026-08-27T03:56:41.054Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-26 11:16:38","lastModifiedDate":"2026-08-27 04:16:50","problem_types":["CWE-93","CWE-93 CWE-93 Improper neutralization of CRLF sequences ('CRLF injection')"],"metrics":{"cvssMetricV31":[{"source":"fe490ce8-0395-4072-90d8-2707e1bdf984","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","baseScore":10,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-08-26T00:00:00+00:00","id":"CVE-2026-77550","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"77550","Ordinal":"1","Title":"CVE-2026-77550","CVE":"CVE-2026-77550","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"77550","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"CVE-2026-77550"}]}}}