The Register: UK and US security agencies order urgent fixes as Cisco firewall bugs exploited in wild

Sep 26, 2025

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Source URL: https://www.theregister.com/2025/09/26/cisco_firewall_flaws/
Source: The Register
Title: UK and US security agencies order urgent fixes as Cisco firewall bugs exploited in wild

Feedly Summary: CISA gives feds 24 hours to patch, NCSC urges rapid action as flaws linked to ArcaneDoor spies
Cybersecurity agencies on both sides of the Atlantic are sounding the alarm over Cisco firewall vulnerabilities that are being exploited by an “advanced threat actor."…

AI Summary and Description: Yes

Summary: The alert from the Cybersecurity and Infrastructure Security Agency (CISA) and the UK’s National Cyber Security Centre (NCSC) about critical vulnerabilities in Cisco firewalls underscores urgent compliance and security requirements for federal agencies. This highlights the necessity of rapid patch deployment to mitigate risks from advanced cyber threats.

Detailed Description: The content revolves around an urgent cybersecurity advisory issued by CISA and NCSC regarding vulnerabilities found in Cisco firewalls. These vulnerabilities are currently being exploited by an advanced threat actor known as ArcaneDoor. Key points include:

– **Urgency in Patching**: CISA has mandated that federal entities must remediate these vulnerabilities within 24 hours, emphasizing the critical nature of the threat.
– **Cooperation Between Agencies**: The collaborative nature of the alert from both U.S. and UK cybersecurity agencies demonstrates a transatlantic approach towards combating shared cybersecurity threats.
– **Advanced Threat Actor**: The mention of ArcaneDoor points to sophisticated cyber capabilities, indicating that organizations must be proactive in their security measures against such actors.
– **Implications for Compliance**: Organizations, particularly within governmental or highly regulated sectors, may face compliance ramifications if they do not respond promptly to such alerts.

Security professionals must take note of:

– The importance of maintaining up-to-date security patches and constant monitoring of threats.
– Ensuring that any vulnerabilities in infrastructure components like firewalls are addressed swiftly to comply with agency mandates.
– The necessity of dynamic risk assessment and management strategies to handle such high-stakes vulnerabilities proactively.

This advisory serves as a reminder of the ongoing challenges in cybersecurity and the need for vigilant, rapid responses to emerging threats.

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