CVE-2021-20035KEV · OVERDUECWE-78

SonicWall SMA100 Appliances OS Command Injection Vulnerability

Medium · published September 27, 2021

Patch now

The score understates this — it's already being exploited

CVSS calls it medium at 6.5. It is confirmed in active exploitation. It sits in the 91.3th percentile for exploit probability.

535
days past CISA
deadline
CVSS v3.1
6.5
EPSS
4%
Percentile
91.3
In the wild
Confirmed
What it is

⚠️ It only takes a sneaky command injection to exploit the SMA100 management interface! An authenticated attacker can take advantage of this vulnerability to unleash chaos. 🔥 Think of it like letting a restaurant server into the kitchen without supervision — they could whip up any dish they want, even the ones that could spoil the entire meal for everyone. This command injection opens the door for unauthorized actions under the guise of a lowly 'nobody'. An attacker could launch arbitrary commands as a 'nobody' user, which could lead to service disruptions or even a complete denial of service. Imagine your favorite online service going down, all because someone decided to stir the pot in the back kitchen!

Put simply

Think of it like letting a restaurant server into the kitchen without supervision — they could whip up any dish they want, even the ones that could spoil the entire meal for everyone. This command injection opens the door for unauthorized actions under the guise of a lowly 'nobody'. This vulnerability involves improper neutralization of special elements, allowing a remote authenticated attacker to inject commands through the SMA100 management interface. The flaw could lead to unintended consequences, potentially causing the system to crash or behave unexpectedly.

What to do

An attacker could launch arbitrary commands as a 'nobody' user, which could lead to service disruptions or even a complete denial of service. Imagine your favorite online service going down, all because someone decided to stir the pot in the back kitchen! To mitigate this vulnerability, ensure that your SMA100 management interface is updated to the latest version available. Review access controls and implement strict user permissions to limit who can use the management interface. Regularly audit and monitor for unusual command executions. 🛡️ You've got this! By taking these steps, you'll be reinforcing your defenses and keeping your systems secure. 🚀

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.04406 · 91.3th percentile
Weakness
CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Published
2021-09-27T17:20Z
KEV added
2025-04-16 · due 2025-05-07
EPSS history
Timeline
  • 16 APR 00:00Z
    Added to CISA KEV — remediate by May 7
    kev
  • 27 SEP 17:20Z
    Improper neutralization of special elements in the SMA100 management interface allows a remote authenticated attacker to inject arbitrary commands as a…
    cvelistv5