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What Is a Firewall and Do you Need One?

Adam Levin

A firewall is a network security device or program designed to prevent unauthorized and malicious internet traffic from entering a private network or device. Firewalls filter incoming network traffic at a computer’s entry points, or ports, where information is exchanged between the computer network and external devices.

Firewall 298
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Attackers exploit recently disclosed Palo Alto Networks PAN-OS firewalls bug

Security Affairs

Threat actors are exploiting a recently disclosed vulnerability, tracked as CVE-2025-0108, inPalo Alto Networks PAN-OS firewalls. Researchers warn that threat actors are exploiting a recently disclosed vulnerability, tracked as CVE-2025-0108, in Palo Alto Networks PAN-OS firewalls. ” states GreyNoise. h4 >= 11.2.4-h4

Firewall 102
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Zyxel 0day Affects its Firewall Products, Too

Krebs on Security

Today, Zyxel acknowledged the same flaw is present in many of its firewall products. “We’ve now completed the investigation of all Zyxel products and found that firewall products running specific firmware versions are also vulnerable,” Zyxel wrote in an email to KrebsOnSecurity. Patch 0 through ZLD V4.35

Firewall 305
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MyBook Users Urged to Unplug Devices from Internet

Krebs on Security

Hard drive giant Western Digital is urging users of its MyBook Live brand of network storage drives to disconnect them from the Internet, warning that malicious hackers are remotely wiping the drives using a critical flaw that can be triggered by anyone who knows the Internet address of an affected device.

Internet 335
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SonicWall warns of an exploitable SonicOS vulnerability

Security Affairs

SonicWall warns customers to address an authentication bypass vulnerability in its firewall’s SonicOS that is “susceptible to actual exploitation.” All customers are encouraged to upgrade their firewalls to the latest MR listed below.” hardware firewalls: SonicOS 6.5.5.1-6n NSv firewalls: SonicOS 6.5.4.v-21s-RC2457

Firewall 115
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Palo Alto Networks confirmed active exploitation of recently disclosed zero-day

Security Affairs

Palo Alto Networks confirmed active exploitation of a zero-day in its PAN-OS firewall and released new indicators of compromise (IoCs). Last week, Palo Alto Networks warned customers to limit access to their next-gen firewall management interface due to a potential remote code execution vulnerability (CVSSv4.0 Base Score: 9.3)

Firewall 127
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Palo Alto Networks warns of potential RCE in PAN-OS management interface

Security Affairs

Palo Alto Networks warns customers to restrict access to their next-generation firewalls because of a potential RCE flaw in the PAN-OS management interface. Palo Alto Networks warns customers to limit access to their next-gen firewall management interface due to a potential remote code execution vulnerability in PAN-OS.

Firewall 116