Network security

Mastering Network Security: Your Resource for Segmentation, Monitoring, Perimeter Defense, and More.

F5 releases out-of-band patches for two critical NGINX bugs

Steve ZurierJune 18, 2026

F5 issued urgent patches for two critical NGINX flaws that could enable DoS or code execution.

Today's Top NetSec Headlines

Network Security News

(Credit: Rafael Henrique – stock.adobe.com)

Network Security

Three critical FortiSandbox bugs rated 9.8 actively exploited

Steve ZurierJune 16, 2026

Active exploitation of FortiSandbox flaws prompt urgent patching calls from security experts.

Network Security

Another Cisco Catalyst SD-WAN Manager bug actively exploited

Steve ZurierJune 5, 2026

Cisco warns of an exploited SD-WAN flaw that can enable remote code execution and network compromise.

Network Security

‘Underminr’ exploitation poses similar risks to domain fronting, researchers say

Laura FrenchMay 22, 2026

ADAMnetworks estimates about 42% of domains could be abused using the technique.

Vulnerability Management

10.0 Cisco Catalyst SD-WAN Controller bug added to CISA’s KEV list

Steve ZurierMay 15, 2026

Maximum-severity bug an authentication bypass flaw that’s considered the highest value target in an attacker’s playbook.

Network Security

Getting Rid of Your VPN – Rob Allen – PSW #925

May 7, 2026

Rob Allen from Threatlocker joins us to discuss the risks associated with VPN appliances and how to implement better security solutions that don't leave you hanging out on the open Internet. The interview segment is sponsored by ThreatLocker. Visit https://securityweekly.com/threatlockerrsac to learn more about them! In the Security News: Less deta...