Yesterday at 9:15 AM, an HR coordinator sent an innocent, 4MB PDF attachment regarding the new summer dress code to the Global-All-Employees distribution list. They forgot to use the BCC field. By 10:30 AM, the core routing infrastructure was gasping for air, and corporate productivity had completely flatlined.
The burn-rate timer hit $14,200 before the Exchange admins could finally kill the thread.
Here is what actually happened.
At 9:18 AM, a junior sales rep in the Denver office clicked "Reply-All" to inform everyone that they thought they were on the wrong list. Three minutes later, a project manager replied-all to aggressively tell the first guy not to reply-all.
The digital avalanche had begun. Within twenty minutes, hundreds of people were replying-all to demand they be unsubscribed, to make terrible jokes, or to furiously demand that people stop replying-all.
If this were just an email server problem, I would have laughed and poured more coffee. But it quickly became a networking nightmare.
Because our remote architecture forces all client traffic back through the core Palo Alto firewalls for inspection, we suddenly had 8,000 hybrid employees simultaneously downloading a 4MB PDF attachment hundreds of times a minute over the VPN. The sheer volume of redundant packet traffic completely saturated the SD-WAN overlay. Latency skyrocketed. Mission-critical applications started dropping connections.
I wasn't optimizing BGP routes or securing the perimeter. I was sitting on an emergency bridge call, watching the firewall interfaces scream for mercy while a Senior VP replied-all to the entire global workforce demanding that IT "leverageLeverageExploiting a tool, process, or junior employee until they completely break down. their tools to execute a swift resolution."
We didn't experience a sophisticated cyberattack yesterday. We accidentally launched a massive, self-inflicted Distributed Denial of Service (DDoS) attack because a corporate workforce doesn't know how the BCC line works.
Total waste generated: $14,200.
Next time your inbox starts rapidly filling with people begging to be taken off a distribution list, don't reply. Just sit back, watch the chaos, and start the timer.
