Looking for a complete Cisco data breaches list? This page answers common searches like "Cisco hacked," "Cisco breach history," and "list of Cisco data breaches" with a verified timeline, record counts, root causes, and step-by-step guidance if you may have been affected.
Cisco data breach history: Yanluowang ransomware, ShinyHunters CRM extortion, and legacy attendee-list hacks mark Cisco’s timeline. BreachHistory indexes 5 verified or attested incidents tied to Cisco, spanning 2010–2026. This page is a complete, searchable timeline—not a single event—linking every catalog row with context on scale, root cause, and what users should do when a new Cisco notice drops.
Why Cisco stays on breach trackers
Global tech brands combine massive user bases, high-value intellectual property, and complex supply chains. Attackers target Cisco for credentials, source code, CRM exports, and employee directories. When you read headlines about "Cisco hacked," the incident may be a consumer PII leak, a developer artifact exposure, or a third-party SaaS tenant breach—each with different remediation steps.
Data breaches list — Cisco
Below are the major incidents in our catalog, newest first. Record counts use company, regulator, or Have I Been Pwned attestation where available; actor-only marketing shows as "Unverified / not disclosed."
- 2026 — Cisco — ShinyHunters extortion; ~3M Salesforce CRM records claimed (vishing / Aura / AWS narrative) (3M+ records)
- 2022 — Yanluowang ransomware / source code (Unverified / not disclosed records)
- 2016 — Cisco: Cisco’s investigation found this to be the result… (Unverified / not disclosed records)
- 2012 — Cisco: Cisco's service provider Ernst & Young experienced… (Unverified / not disclosed records)
- 2010 — Cisco: Someone hacked the list of attendees for the recent… (Unverified / not disclosed records)
Biggest and most consequential incidents
2026 Cisco — ShinyHunters extortion; ~3M Salesforce CRM records claimed (vishing / Aura / AWS narrative)
In early April 2026, the extortion group ShinyHunters publicly claimed theft of more than three million Salesforce CRM records from Cisco and posted demands with an early-April deadline in trade reporting. Journalists summarized an alleged multi-vector narrative—tying together voice phishing (vishing), Salesforce Aura exploitation, and unauthorized AWS access—while noting Cisco had previously disclosed a vishing-related CRM export affecting Cisco.com registrant profile data in August 2025. Industry coverage emphasi… Full incident record →
2022 Yanluowang ransomware / source code
Attackers linked to Yanluowang ransomware gained access to Cisco's corporate network and stole source code and other files. Cisco stated no customer data was exfiltrated. Full incident record →
2016 — Cisco: Cisco’s investigation found this to be the result…
Cisco’s investigation found this to be the result of an incorrect security settingfollowing system maintenance. The issue was immediately fixed and passwords to the site have been disabled. Because Cisco takes its responsibility to protect information seriously, and since many people use the same passwords on multiple websites, we wanted to alert you to this incident.As a precaution, users of Cisco’s Professional Careers Website will need to reset their passwords at their next login b Full incident record →
By the numbers (catalog snapshot)
- 5 incidents indexed under Cisco on BreachHistory
- 3M+ combined attested records across rows with disclosed numerators (many incidents overlap or count emails—not unique people)
- 2026 — year of the largest attested row in our catalog
Patterns in Cisco's breach history
- Credential and session theft — Phishing, stuffing, and OAuth token abuse recur across tech platforms.
- Cloud misconfiguration — S3 buckets, misconfigured APIs, and file shares expose data without a traditional "hack."
- Extortion without precise counts — Ransomware and leak-site actors often publish before victims confirm scope.
- Supply-chain spillover — npm, SDK, and CRM tenant breaches affect Cisco customers even when corporate HQ databases stay intact.
What to do if you used Cisco
- Enable multi-factor authentication on every Cisco account and linked SSO identity.
- Check Have I Been Pwned when new Cisco headlines appear.
- Rotate passwords that were reused on email, banking, or work SSO.
- Watch for phishing that cites real breach details (order numbers, usernames) to appear legitimate.
- Follow official Cisco security communications—not SMS links from unknown numbers.
Related searches
- Cisco data breach list
- Has Cisco been hacked?
- Cisco hack history
- Cisco data leak timeline
- How many times has Cisco been breached?
- Cisco breach records on BreachHistory
FAQ
How many data breaches has Cisco had?
BreachHistory indexes 5 verified or attested Cisco data breaches spanning 2010–2026. Counts vary when researchers merge scraping, misconfiguration, and ransomware as separate events.
What is the biggest Cisco data breach?
The largest attested incident in our catalog is 3M+ records (Cisco — ShinyHunters extortion; ~3M Salesforce CRM records claimed (vish). See the full timeline for sources and remediation details.
Has Cisco been hacked?
Yes — Cisco appears on breach trackers with 5 indexed incidents including Cisco — ShinyHunters extortion; ~3M Salesforce CRM records claimed (vish. This page links every catalog row with primary sources and what users should do if affected.
Does Cisco send data breach notifications?
Regulated markets require consumer notices for many PII events. Not every source-code or scraping story triggers email alerts—read each incident row for notification status.
Explore every Cisco incident on BreachHistory
Browse the full catalog: Cisco breach records
Compiled from BreachHistory data/breaches.json and primary sources linked on each incident page. Updated 2026-06-15.