SFTP Server Authentication Weakness

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Summary

CVECVE-2026-5268
StatePUBLISHED
AssignerCiena
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-06 16:16:38 UTC
Updated2026-07-08 21:16:54 UTC
DescriptionAn 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.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.004200000 probability, percentile 0.339300000 (date 2026-07-11)

Problem Types: CWE-288 | CWE-288 CWE-288 Authentication bypass using an alternate path or channel

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA CIENA 6500 S-Series affected R16.96 and prior Not specified
CNA CIENA 6500 T-Series affected R16.1 and prior Not specified
CNA CIENA PTS affected R16.1 and prior Not specified
CNA CIENA CPL affected R12.63 and prior Not specified

References

ReferenceSourceLinkTags
www.ciena.com/product-security 7bd90cf1-1651-495e-9ae8-9415fb3c9feb www.ciena.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Ciena recommends upgrading to the latest available remediated release. For additional details, refer to myciena.com for current software versions, fixes, and security advisories.

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