FKIE_CVE-2026-5268

Vulnerability from fkie_nvd - Published: 2026-07-06 16:16 - Updated: 2026-07-06 19:17
Severity
9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Summary
An authentication bypass vulnerability exists in the default SFTP server component utilized across the Ciena products listed. This vulnerability allows a remote, unauthenticated attacker to bypass security controls and gain unauthorized access to the underlying filesystem. Successful exploitation could allow an attacker to read or modify system files.
References
7bd90cf1-1651-495e-9ae8-9415fb3c9febhttps://www.ciena.com/product-security
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "affected",
          "product": "6500 S-Series",
          "vendor": "CIENA",
          "versions": [
            {
              "status": "affected",
              "version": "R16.96 and prior"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "6500 T-Series",
          "vendor": "CIENA",
          "versions": [
            {
              "status": "affected",
              "version": "R16.1 and prior"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "PTS",
          "vendor": "CIENA",
          "versions": [
            {
              "status": "affected",
              "version": "R16.1 and prior"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "CPL",
          "vendor": "CIENA",
          "versions": [
            {
              "status": "affected",
              "version": "R12.63 and prior"
            }
          ]
        }
      ],
      "source": "7bd90cf1-1651-495e-9ae8-9415fb3c9feb"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An authentication bypass vulnerability exists in\nthe default SFTP server component utilized across the Ciena products listed. This vulnerability allows a remote, unauthenticated attacker to bypass\nsecurity controls and gain unauthorized access to the underlying filesystem.\nSuccessful exploitation could allow an attacker to read or modify system files."
    }
  ],
  "id": "CVE-2026-5268",
  "lastModified": "2026-07-06T19:17:09.110",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.2,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-5268",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-06T18:42:35.509616Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-06T16:16:38.433",
  "references": [
    {
      "source": "7bd90cf1-1651-495e-9ae8-9415fb3c9feb",
      "url": "https://www.ciena.com/product-security"
    }
  ],
  "sourceIdentifier": "7bd90cf1-1651-495e-9ae8-9415fb3c9feb",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-288"
        }
      ],
      "source": "7bd90cf1-1651-495e-9ae8-9415fb3c9feb",
      "type": "Secondary"
    }
  ]
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.