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Listed on a ransomware leak site

Ciena

ciena.com

Ciena was listed on the Everest and Clop leak site on Jul 5, 2023. Brandefense has recorded 3 separate claims against it. Information as of Oct 19, 2026.

Updated continuously · figures as of Oct 19, 2026
Claimed by
Everest, Clop
First listed
Jul 5, 2023
Claims recorded
3

3 Leak-Site Claims.

EverestConfirmed claim
Posted on the leak site
Jan 20, 2026
Collected by Brandefense
Apr 3, 2026
Data claimed
11 GB
Leak-site post text, written by the group
Ciena Corporation is a US-based global supplier of telecommunications networking equipment, software, and services. The company's solutions support the delivery of voice, video, and data traffic for many of the world's largest telecom service providers. Its product portfolio includes solutions for optical transport, broadband access, data center connectivity, and software automation. It was founded in 1992 and headquartered in Hanover, Maryland.
ClopConfirmed claim
Posted on the leak site
Feb 26, 2024
Collected by Brandefense
Jul 11, 2025
Data claimed
Not stated
ClopConfirmed claim
Posted on the leak site
Jul 5, 2023
Collected by Brandefense
Jul 12, 2025
Data claimed
Not stated
Leak-site post text, written by the group
Ciena - A networking systems, services, and software company - Ciena

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Figures as of Oct 19, 2026. Confirmed leak-site claims collected by Brandefense technologies and validated by Brandefense analysts.

Listed on a leak site means a ransomware group has claimed the company; it is not a confirmed breach. To request a correction or removal, contact Brandefense.