CVE-2020-19596

Buffer overflow vulnerability in Core FTP Server v1.2 Build 583, via a crafted username

published April 5, 2021

CVSS
—
EPSS
1%
Percentile
70.0
In the wild
Unconfirmed
What it is

⚠️ A crafty username is all it takes to trigger this buffer overflow! The Core FTP Server v1.2 Build 583 is vulnerable to a sneaky attack that could send your data reeling. 🔥 Think of it as overfilling a glass—once you pour in too much, it spills everywhere! In this case, an overly long username can overflow the buffer, causing chaos in the server's memory. If an attacker exploits this vulnerability, they could potentially crash the server, leading to service disruptions. While it may not be the worst-case scenario, losing access to your FTP server could certainly disrupt your daily operations and lead to data loss.

Put simply

Think of it as overfilling a glass—once you pour in too much, it spills everywhere! In this case, an overly long username can overflow the buffer, causing chaos in the server's memory. This buffer overflow vulnerability occurs when a crafted username exceeds the expected length, causing the server to overwrite adjacent memory space. This could allow an attacker to alter or corrupt data, or even crash the application.

What to do

If an attacker exploits this vulnerability, they could potentially crash the server, leading to service disruptions. While it may not be the worst-case scenario, losing access to your FTP server could certainly disrupt your daily operations and lead to data loss. To remediate this issue, update your Core FTP Server to the latest version that fixes this buffer overflow. Also, consider implementing stricter validation on usernames to ensure they don't exceed typical limits. Regularly audit your server's configurations to keep them secure. You've got this! With a few adjustments and updates, your server will be as safe as a well-guarded treasure! 🛡️

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.01289 · 70.0th percentile
Published
2021-04-05T20:33Z
EPSS history
Timeline
  • 05 APR 20:33Z
    Buffer overflow vulnerability in Core FTP Server v1.2 Build 583, via a crafted username
    cvelistv5