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 with 6 confirmed incidents; the most recent notice was filed on December 30, 2020.

Data as of September 6, 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
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
What a California notice means

Required under 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