BreachCensus

Cisco Systems, Inc.

TechnologyUnited States of America

Cisco Systems, Inc. is a technology organisation in United States of America. It appears on the California Attorney General breach-notification register and the Iowa Attorney General security breach notification list with 6 confirmed incidents; the most recent notice was filed on December 30, 2020.

Headquarters
San Jose, United States
Employees
86,200 (as of 2025)
ISIN
US17275R1023
Wikidata
Q173395

Data as of September 26, 2026.

Confirmed incident

US-IA

Disclosed
December 30, 2020

Timeline

  1. December 30, 2020
    Reported to regulator Regulator

    IA AG breach notification: an unknown number of Iowa residents affected

    source
What a Iowa notice means

Governed by Iowa Code §715C.2. Notice to the Attorney General is required within five business days of notifying consumers, for a breach requiring notification to more than 500 Iowa residents.

Note: no affected-count is published on this register.

Iowa breach-notification register ↗

Confirmed incident

US-CA

Occurred
August 18, 2016
Disclosed
October 25, 2016

Timeline

  1. October 25, 2016
    Reported to regulator Regulator

    CA AG breach notification: an unknown number of California residents affected

    source
  2. February 13, 2018
    Litigation filed Court

    RECAP docket 2:18-cv-00094 (vaed): Centripetal Networks, LLC v. Cisco Systems, Inc.

    source

Litigation

What a California notice means

Governed by Cal. Civ. Code §1798.82. A copy of the notification must be sent to the Attorney General when a single breach requires notifying more than 500 California residents.

Note: no affected-count is published on this register.

California breach-notification register ↗

Unverified claim

US — Ransomware Attack

This is an unverified claim — it has allegedly happened to this organisation, as posted by a source below, but has not been confirmed by a regulator, a court filing or the organisation’s own disclosure.

Timeline

  1. April 19, 2024
    Claimed by threat actor (unverified) Claim

    Ransomware leak-site claim (ransomware_live)

    source
Unverified claim

US — Ransomware Attack

This is an unverified claim — it has allegedly happened to this organisation, as posted by a source below, but has not been confirmed by a regulator, a court filing or the organisation’s own disclosure.

Timeline

  1. April 24, 2024
    Claimed by threat actor (unverified) Claim

    Ransomware leak-site claim (ransomware_live)

    source
Unverified claim

US — Ransomware Attack

This is an unverified claim — it has allegedly happened to this organisation, as posted by a source below, but has not been confirmed by a regulator, a court filing or the organisation’s own disclosure.

Timeline

  1. July 23, 2025
    Claimed by threat actor (unverified) Claim

    Ransomware leak-site claim (ransomware_live)

    source
Unverified claim

US — Ransomware Attack

This is an unverified claim — it has allegedly happened to this organisation, as posted by a source below, but has not been confirmed by a regulator, a court filing or the organisation’s own disclosure.

Timeline

  1. April 24, 2024
    Claimed by threat actor (unverified) Claim

    Ransomware leak-site claim (ransomware_live)

    source