CVE-2021-43928CWE-78

Improper neutralization of special elements used in an OS command ('OS Command Injection') vulnerability in mail sending and receiving component in Synology…

Critical · published February 7, 2022

CVSS v3.1
9.9
EPSS
2%
Percentile
79.1
In the wild
Unconfirmed
What it is

🚨 A crafty command injection vulnerability lurks in Synology Mail Station, letting remote authenticated users execute arbitrary commands! 🔥 Think of it like a waiter who accepts any special request without checking the menu — and suddenly, you’ve got a five-course meal with no idea where it came from! This means an attacker could potentially gain complete control over your mail server, snoop on sensitive communications, or even shut the server down. The consequences could be absolutely devastating for your organization, exposing data and risking your operations.

Put simply

Think of it like a waiter who accepts any special request without checking the menu — and suddenly, you’ve got a five-course meal with no idea where it came from! This vulnerability arises from improper handling of special characters in OS commands, allowing attackers to run malicious commands on the server as authenticated users. As such, it’s not just a harmless oversight; it can lead to significant breaches.

What to do

This means an attacker could potentially gain complete control over your mail server, snoop on sensitive communications, or even shut the server down. The consequences could be absolutely devastating for your organization, exposing data and risking your operations. Immediately update Synology Mail Station to version 20211105-10315 or later to patch this flaw. Consider reviewing user permissions to limit access to trusted individuals only. 🔒 You’ve got this! With these fixes, you’ll be on your way to securing your systems in no time! 🛡️

The record
Technical detail
CVSS v3.1
9.9 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.01865 · 79.1th percentile
Weakness
CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Published
2022-02-07T02:15Z
EPSS history
Timeline
  • 07 FEB 02:15Z
    Improper neutralization of special elements used in an OS command ('OS Command Injection') vulnerability in mail sending and receiving component in Synology…
    cvelistv5