CVE-2026-77550 (GCVE-0-2026-77550)
Vulnerability from cvelistv5
Published
2026-08-26 10:33
Modified
2026-08-27 03:56
Severity ?
10.0 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CWE
  • CWE-93 - Improper neutralization of CRLF sequences ('CRLF injection')
Summary
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
Impacted products
Vendor Product Version
Ubiquiti Inc UniFi OS Server Version: 0   ≤
Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "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 (\u0027CRLF injection\u0027)",
              "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",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "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 (\u0027CRLF injection\u0027)\"}]}], \"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\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.