What it is
Ports where databases (MySQL, PostgreSQL, MongoDB, Oracle …) accept direct connections.
Why it is risky
A DB port open to the internet invites credential brute-force and known-CVE exploitation that can exfiltrate an entire dataset — the shortest path to a breach or ransom.
What to do
Allow access only from app servers / internal networks (private ranges or VPN); close it on public interfaces.
Is it listening on your server?
Linux
ss -ltnp 'sport = :3306'Known vulnerabilities in MySQL / MariaDB
| CVE | Title | CVSS | Exploited | EPSS | Published |
|---|---|---|---|---|---|
| CVE-2004-0627 | The check_scramble_323 function in MySQL 4.1.x before 4.1.3, and 5.0, allows remote attackers to bypass authen... | 10.0 | — | 2004-07-08 | |
| CVE-2004-0628 | Stack-based buffer overflow in MySQL 4.1.x before 4.1.3, and 5.0, allows remote attackers to cause a denial of... | 10.0 | — | 2004-07-08 | |
| CVE-2003-0780 | Buffer overflow in get_salt_from_password from sql_acl.cc for MySQL 4.0.14 and earlier, and 3.23.x, allows att... | 9.0 | — | 2003-09-12 | |
| CVE-2009-2446 | Multiple format string vulnerabilities in the dispatch_command function in libmysqld/sql_parse.cc in mysqld in... | 8.5 | — | 2009-07-14 |
Track these versions on your own servers
InfraGuard collects installed software versions from every server and flags the ones with known vulnerabilities. Self-hosted — nothing leaves your network.