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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.
Weekly headline count for the current query.
The Cybersecurity and Infrastructure Security Agency (CISA) has ordered federal agencies to patch a maximum-severity vulnerability, CVE-2026-20131, in Cisco Secure Firewall Management Center (FMC) by Sunday, March 22. [...]
Fortinet customers are seeing attackers exploiting a patch bypass for a previously fixed critical FortiGate authentication vulnerability (CVE-2025-59718) to hack patched firewalls. [...]
Palo Alto Networks warns that hackers are actively exploiting a critical authentication bypass flaw (CVE-2025-0108) in PAN-OS firewalls, chaining it with two other vulnerabilities to breach devices in active attacks. [...]
Hackers are launching attacks against Palo Alto Networks PAN-OS firewalls by exploiting a recently fixed vulnerability (CVE-2025-0108) that allows bypassing authentication. [...]
Security researchers at Bishop Fox have published complete exploitation details for the CVE-2024-53704 vulnerability that allows bypassing the authentication mechanism in certain versions of the SonicOS SSLVPN application. [...]
Palo Alto Networks is warning that hackers are exploiting the CVE-2024-3393 denial of service vulnerability to disable firewall protections by forcing it to reboot. [...]
Fog and Akira ransomware operators have increased their exploitation efforts of CVE-2024-40766, a critical access control flaw that allows unauthorized access to resources on the SSL VPN feature of SonicWall SonicOS firewalls. [...]
Approximately 22,500 exposed Palo Alto GlobalProtect firewall devices are likely vulnerable to the CVE-2024-3400 flaw, a critical command injection vulnerability that has been actively exploited in attacks since at least March 26, 2024. [...]
Suspected state-sponsored hackers have been exploiting a zero-day vulnerability in Palo Alto Networks firewalls tracked as CVE-2024-3400 since March 26, using the compromised devices to breach internal networks, steal data and credentials. [...]
Sophos was forced to backport a security update for CVE-2022-3236 for end-of-life (EOL) firewall firmware versions after discovering hackers actively exploiting the flaw in attacks. [...]
Hundreds of thousands of FortiGate firewalls are vulnerable to a critical security issue identified as CVE-2023-27997, almost a month after Fortinet released an update that addresses the problem. [...]
Hackers are performing widespread exploitation of a critical-severity command injection flaw in Zyxel networking devices, tracked as CVE-2023-28771, to install malware. [...]
Hackers have started to exploit a recently patched critical vulnerability, tracked as CVE-2022-30525, that affects Zyxel firewall and VPN devices for businesses. [...]
Sophos has fixed a critical vulnerability in its Sophos Firewall product that allows remote code execution. Tracked as CVE-2022-1040, the authentication bypass vulnerability exists in the User Portal and Webadmin areas of Sophos Firewall. [...]