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Background for this topic.
Firewalls are security controls that permit or block network connections according to policy. They can operate at network boundaries, between internal segments, on individual hosts, or in cloud environments. Basic rules use addresses, ports, protocols, and connection state; more advanced firewalls may inspect applications or encrypted traffic where configured. Their purpose is to limit which systems can communicate, not to determine that all permitted traffic is safe.
Security depends heavily on accurate policy and maintenance. Overly broad, obsolete, or conflicting rules can expose services or allow unnecessary lateral movement, while unmanaged administrative interfaces and unpatched firewall software create additional attack surfaces. Practitioners should restrict management access, apply least-privilege rules, review and remove exceptions, and monitor logs for unexpected connections and policy changes. Firewall logs can support investigation, but encryption, evasion, and traffic allowed by policy may limit what the control can detect.
An attack campaign has been identified which exploits vulnerabilities in Cisco Adaptive Security Appliance software
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."…
The U.K. National Cyber Security Centre (NCSC) has revealed that threat actors have exploited the recently disclosed security flaws impacting Cisco firewalls as part of zero-day attacks to deliver previously undocumented malware families like RayInitiator and LINE VIPER
CISA Issues Emergency Directive After Cisco Exploits Persist After RebootCISA issued an emergency directive Thursday after discovering an advanced hacking campaign exploiting two persistent zero-days in Cisco firewall gear - malware that survives system reboots and upgrades - forcing agencies to disconnect vulnerable devices by Friday.
Patch now: Cisco recently disclosed four actively exploited zero-days affecting millions of devices, including three targeted by a nation-state actor previously discovered to be behind the "ArcaneDoor" campaign.
Cisco is urging customers to patch two security flaws impacting the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software, which it said have been exploited in the wild
CISA has issued a new emergency directive ordering U.S. federal agencies to secure their Cisco firewall devices against two flaws that have been exploited in zero-day attacks. [...]
Cisco warned customers today to patch two zero-day vulnerabilities that are actively being exploited in attacks and impact the company's firewall software. [...]