by Kastro CVE-2026-5268
CIENA 6500 S-Series — SFTP Server Authentication Weakness
Description · from the CVE record
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.
Affected
ProductAffectedFixed inSource
6500 S-SeriesR16.96 and prior–CNA
6500 T-SeriesR16.1 and prior–CNA
PTSR16.1 and prior–CNA
CPLR12.63 and prior–CNA
Scores by source
CISA ADP9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total