CVE-2026-5268

CRITICAL

CIENA 6500 S-Series - SFTP Server Authentication Weakness

Title source: rule

Description

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 (1)

Core 1

Core References

Vendor Advisory vendor-advisory

https://www.ciena.com/product-security

Scores

CVSS v3 9.1

EPSS 0.0042

EPSS Percentile 33.8%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact total

Details

CWE

CWE-288

Status published

Products (4)

CIENA/6500 S-Series R16.96 and prior

CIENA/6500 T-Series R16.1 and prior

CIENA/CPL R12.63 and prior

CIENA/PTS R16.1 and prior

Published Jul 06, 2026

Tracked Since Jul 06, 2026