---
title: "Cisco security incident"
description: "What the retained public evidence establishes about the Cisco incident, its attack path, impact, and response."
incident_type: "Cybersecurity incident"
status: "active"
last_modified: "2026-09-19"
canonical_url: "https://www.ally.security/incidents/cisco-security-incident-2022"
markdown_url: "https://www.ally.security/incidents/cisco-security-incident-2022.md"
stix_url: "https://www.ally.security/incidents/cisco-security-incident-2022/stix.json"
---

# Cisco security incident

Yanluowang group; employee's personal Google account synced corporate credentials, plus voice phishing and MFA fatigue. No ransomware deployed; some non-sensitive files exfiltrated.

Last modified Sep 19, 2026 · 1 source

## Summary

- **Environment:** Networking/Tech
- **Operational impact:** No ransomware deployed; some non-sensitive files exfiltrated
- **Financial impact:** No financial figure is established by the reviewed source evidence

## What happened

In 2022, Cisco experienced an incident in its networking/tech environment. The retained source describes the attack path as follows: Yanluowang group; employee's personal Google account synced corporate credentials, plus voice phishing and MFA fatigue. [1](#source-1)

The documented consequence was: No ransomware deployed; some non-sensitive files exfiltrated. [1](#source-1)

## Impact

- Documented impact: No ransomware deployed; some non-sensitive files exfiltrated. [1](#source-1)
- No financial loss, ransom amount, recovery cost, or regulatory penalty is established by the reviewed source evidence.

## Timeline

### August 10, 2022 — Documented public update

The [Cisco response to recent cyber attack](https://blog.talosintelligence.com/recent-cyber-attack/) records the incident facts used in this briefing. [1](#source-1)

### September 19, 2026 — Briefing updated

This briefing was last reviewed and updated on September 19, 2026.

## Threat Group & Attack Vector

The retained source describes the attack path as follows: Yanluowang group; employee's personal Google account synced corporate credentials, plus voice phishing and MFA fatigue. The canonical record does not add intrusion steps beyond those supported by the source. [1](#source-1)

### Actors

- **Yanluowang** — identified in the supported attack description. [1](#source-1)

### TTPs

- [T1566 — Phishing](https://attack.mitre.org/techniques/T1566/) — mapped from the cited behavior. [1](#source-1)
- [T1621 — Multi-Factor Authentication Request Generation](https://attack.mitre.org/techniques/T1621/) — mapped from the cited behavior. [1](#source-1)

## Response

The reviewed source does not describe containment, notification, or restoration steps in enough detail to summarize them responsibly.

This account is bounded to [Cisco response to recent cyber attack](https://blog.talosintelligence.com/recent-cyber-attack/). Details absent from that evidence are left unresolved rather than inferred. [1](#source-1)

## Assets

[Download the case-scoped STIX 2.1 bundle](<https://www.ally.security/incidents/cisco-security-incident-2022/stix.json>)

## Sources

Primary source records used to research this incident.

<a id="source-1"></a>

### Cisco response to recent cyber attack

research · Cisco Talos

<https://blog.talosintelligence.com/recent-cyber-attack/>

<details>
<summary>Evidence ledger</summary>

Review the supporting structured claims.

1. **Used Attack Technique · 90% confidence · current**  
   Cisco security incident: https://attack.mitre.org/techniques/T1621/
2. **Affected Organization · 100% confidence · current**  
   Cisco security incident: Cisco
3. **Resulted In · 85% confidence · current**  
   Cisco security incident: No ransomware deployed; some non-sensitive files exfiltrated.
4. **Used Attack Technique · 90% confidence · current**  
   Cisco security incident: https://attack.mitre.org/techniques/T1566/
5. **Occurred At · 100% confidence · current**  
   Documented public update: 2022-08-10
6. **Resulted In · 100% confidence · current**  
   Cisco security incident: The reviewed source documents the cisco security incident involving Cisco.
7. **Resulted In · 90% confidence · current**  
   Cisco security incident: Yanluowang group; employee's personal Google account synced corporate credentials, plus voice phishing and MFA fatigue.

</details>