---
title: "Hackers have breached the Cisco firewall used by the U.S. government, affecting critical infrastruct"
description: "Hackers have breached the Cisco firewall used by the U.S. government, affecting critical infrastructure. On September 26, the U.S. Cybersecurity and Infrastructure Security Agency issued an emergency "
type: "news"
locale: "en"
url: "https://longbridge.com/en/news/259103861.md"
published_at: "2025-09-26T15:59:52.000Z"
---

# Hackers have breached the Cisco firewall used by the U.S. government, affecting critical infrastruct

> Hackers have breached the Cisco firewall used by the U.S. government, affecting critical infrastructure. On September 26, the U.S. Cybersecurity and Infrastructure Security Agency issued an emergency directive requiring federal agencies to identify vulnerabilities and eliminate potential intrusions. The specific departments affected and the severity of the attack have not been disclosed, but assessments suggest that the attack has reached critical infrastructure. Cisco stated that this attack is suspected to be related to the 2024 "ArcaneDoor" hacking operation

Hackers have breached the Cisco firewalls used internally by the U.S. government, with a preliminary assessment indicating that critical infrastructure has been affected. On September 26, the U.S. Cybersecurity and Infrastructure Security Agency revealed this news. The agency issued an emergency directive requiring federal agencies to investigate vulnerabilities in Cisco firewalls and identify and eliminate potential intrusions. The specific departments affected and the severity of the attacks have not yet been disclosed, but the agency assesses that the related attacks have reached critical infrastructure. Cisco stated in the report that this attack is highly suspected to be carried out by the same group of hackers behind the "ArcaneDoor" hacking operation initiated in 2024

### Related Stocks

- [CSCO.US - Cisco](https://longbridge.com/en/quote/CSCO.US.md)

## Related News & Research

| Title | Description | URL |
|-------|-------------|-----|
| 思科業績向好，上調全年收入預期，季度指引超預期 | 思科第二財季營收 153 億美元，超出分析師預期的 151.2 億美元。產品營收 116.4 億美元，服務營收 37.1 億美元，均低於預期。調整後每股收益為 1.04 美元，略高於預期。公司上調全年營收預期至 612 億-617 億美元， | [Link](https://longbridge.com/en/news/275659800.md) |
| 思科｜10-Q：2026 財年 Q2 營收 153 億美元超過預期 |  | [Link](https://longbridge.com/en/news/276170940.md) |
| JSW 基礎設施公司通知召開董事會會議，商討籌集資金的提案 | JSW 基礎設施公司通知召開董事會會議，討論籌集資金的提案 | [Link](https://longbridge.com/en/news/276055874.md) |
| Cibc World Market Inc. 持有思科系統公司價值 8255 萬美元的股份 | Cibc World Market Inc. 在第三季度將其在思科系統公司的股份增加了 22.9%，目前持有 1,206,519 股，價值為 8255 萬美元。其他機構投資者也調整了他們的持股。內部交易包括董事 Kristina M. Jo | [Link](https://longbridge.com/en/news/275588586.md) |
| HCLTech 攜手思科推出 Fluid Contact Center | HCLTech 與思科推出 Fluid Contact Center | [Link](https://longbridge.com/en/news/275871647.md) |

---

> **Disclaimer**: This article is for reference only and does not constitute any investment advice.