CVE-1999-0250

Denial of service in Qmail through long SMTP commands

published February 4, 2000

CVSS
—
EPSS
2%
Percentile
82.9
In the wild
Unconfirmed
What it is

⚠️ A long SMTP command can knock Qmail offline with ease! It's like a restaurant being overwhelmed by a single diner ordering the entire menu! 🍽️ Imagine a busy restaurant where one customer decides to order every dish on the menu at once – chaos ensues! This is what happens when a long SMTP command overwhelms the Qmail server, causing it to crash under the pressure. An attacker could send an excessively long command that causes the Qmail service to slow down or become completely unresponsive. This denial of service could leave email services unreachable, affecting communication and productivity.

Put simply

Imagine a busy restaurant where one customer decides to order every dish on the menu at once – chaos ensues! This is what happens when a long SMTP command overwhelms the Qmail server, causing it to crash under the pressure. This vulnerability arises from Qmail's inability to properly handle overly long SMTP commands, leading to potential crashes or service slowdowns when bombarded with such requests.

What to do

An attacker could send an excessively long command that causes the Qmail service to slow down or become completely unresponsive. This denial of service could leave email services unreachable, affecting communication and productivity. To mitigate this issue, ensure that Qmail is updated to the latest version with all relevant patches. Additionally, implement rate limiting to prevent excessive command lengths from being processed. Regularly monitor your server's performance to catch any unusual activity. You've got this! With a few proactive measures, you can keep your email services running smoothly and fend off potential disruptions! 🛡️

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.02269 · 82.9th percentile
Published
2000-02-04T05:00Z
EPSS history
Timeline
  • 04 FEB 05:00Z
    Denial of service in Qmail through long SMTP commands
    cvelistv5