Most people associate denial of service attacks with overloaded websites and unavailable servers. FloodCRM highlights a different kind of disruption: overwhelming a person with emails, SMS messages, and automated phone calls.
The article presents FloodCRM as a tool for coordinating this type of communication flood. Instead of attacking a network directly, it takes advantage of the systems businesses use to contact customers, such as registration forms, verification services, callback requests, and CRM notifications.
What interested me most is that the individual messages may come from legitimate companies. The abuse happens at the workflow level. A service performs its normal function, but someone has manipulated it into contacting a person who never requested anything.
A Denial of Service Attack Against Human Attention
Flooding a phone number or email address is sometimes described as message bombing. That name is accurate, but it can make the activity sound less serious than it is.
A coordinated flood can make a phone temporarily difficult to use. Important messages become buried under unwanted notifications. Repeated calls interrupt work, study, and sleep. If the messages arrive from many unrelated services, blocking one sender does not solve the problem.
In that sense, the target is not only the device. The attacker is trying to exhaust human attention.
There can also be a security motive behind the noise. Email bombing has been used as a distraction when an attacker wants to hide a password reset, purchase receipt, banking notification, or account security warning. A victim dealing with hundreds of messages may overlook the one notification that actually matters.
That is why a sudden communication flood should not be treated only as spam. It can be a sign that someone is attempting to access an account or conceal another action.
Why CRM and Notification Systems Are Attractive Targets
Modern websites connect to many communication services. A single form submission might trigger an email, an SMS message, a phone call, or several internal events.
These features are useful when the person submitting the request is a real customer. Problems appear when the system does not adequately verify consent or limit repeated requests.
An attacker does not necessarily need access to the company’s infrastructure. A publicly available form may be enough. If the form accepts arbitrary contact information and can be submitted repeatedly, it becomes an abuse channel.
This creates an amplification effect. The attacker sends a relatively simple request, while the business pays for and delivers the resulting message or call. When many services are abused at once, the victim sees messages from numerous legitimate sources rather than from a single obvious attacker.
It also creates collateral damage. Companies may pay SMS or telephony fees, receive complaints, damage their sender reputation, and have their domains or phone numbers incorrectly associated with spam. Support employees then have to investigate activity that their own systems generated.
The Defensive Problem Is More Complicated Than CAPTCHA
CAPTCHA can reduce automated submissions, but it should not be the only defense. Attackers can sometimes bypass weak challenges, reuse valid sessions, or rely on manual submission for smaller harassment campaigns.
A better design uses several controls together.
Rate limits should apply to more than the source IP address. Services can also monitor the destination phone number, email address, account, device, and session. Otherwise, an attacker can rotate network addresses while continuing to target the same person.
Sensitive workflows should require confirmation before starting repeated communication. A callback request, for example, should not be allowed to generate unlimited calls to an unverified number.
Applications should also make repeated requests idempotent when possible. If the same action is submitted multiple times within a short period, the system should process it once instead of generating a new notification every time.
Behavioral monitoring is important as well. A single source requesting messages for hundreds of recipients is suspicious, but so is a large number of sources requesting messages for one recipient. Both patterns matter, and they require different detection rules.
Finally, organizations need a clear way for recipients to report unwanted notifications. Abuse reports should reach the security or fraud team, not disappear inside a general customer support queue.
What to Do If a Message Flood Starts
The first instinct may be to delete everything, silence the phone, or mark all messages as spam. Those actions can provide temporary relief, but they should not be the only response.
I would first look for anything unusual inside the flood, especially password reset emails, login warnings, order confirmations, financial alerts, or changes to account details. Important accounts should be checked by opening their official applications or typing their addresses manually, not by following links inside unexpected messages.
Passwords should be changed if there is any indication of account access, and multifactor authentication should be enabled where available. Existing sessions and connected devices should also be reviewed.
It is useful to preserve evidence, including screenshots, timestamps, sender information, and call logs. The victim can then contact their mobile provider, email provider, or the organizations generating the notifications. If the activity includes threats, fraud, or sustained harassment, reporting it to the appropriate authorities may also be necessary.
The Larger Cybersecurity Lesson
FloodCRM is interesting because it demonstrates how ordinary business automation can be turned against both users and service providers. The underlying problem is not limited to one tool. Any public workflow that sends a message, initiates a call, or creates an expensive downstream action can become an abuse primitive.
As an IT student, I find this especially relevant because developers often focus on whether a feature works as intended. Security requires another question: what happens when someone intentionally uses the feature in a way it was never designed to handle?
A notification system should not automatically trust every request just because the request follows the correct format. It needs limits, verification, monitoring, and a plan for responding to abuse.
Communication flooding may not look like a traditional cyberattack, but it combines automation, resource abuse, social disruption, and sometimes account fraud. That makes it a useful reminder that availability is not only about keeping servers online. It is also about ensuring that people can still find and trust the communications that matter.
Original source: https://telegra.ph/FloodCRM-Bombardare-%C3%AEn-mas%C4%83-cu-e-mailuri-SMS-uri-%C8%99i-apeluri-telefonice-08-13