VDB-183461 · CVE-2021-20035 · SNWLID-2021-0022

SonicWALL SMA100 Management Interface os command injection

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.4	$0-$5k	0.00

Summaryinfo

A vulnerability was found in SonicWALL SMA100. It has been classified as critical. This vulnerability affects unknown code of the component Management Interface. The manipulation leads to os command injection. This vulnerability is documented as CVE-2021-20035. The attack can be initiated remotely. Additionally, an exploit exists.

Detailsinfo

A vulnerability was found in SonicWALL SMA100 (Firewall Software) (unknown version) and classified as critical. This issue affects an unknown code block of the component Management Interface. The manipulation with an unknown input leads to a os command injection vulnerability. Using CWE to declare the problem leads to CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability.

The weakness was released 09/28/2021 as SNWLID-2021-0022. The advisory is shared at psirt.global.sonicwall.com. The identification of this vulnerability is CVE-2021-20035 since 12/17/2020. Technical details are unknown but an exploit is available. MITRE ATT&CK project uses the attack technique T1202 for this issue.

It is declared as attacked. The vulnerability scanner Nessus provides a plugin with the ID 235817 (SonicWall Secure Mobile Access DoS (SNWLID-2021-0022)), which helps to determine the existence of the flaw in a target environment. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 04/16/2025 with a due date of 05/07/2025:

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (235817). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Firewall Software

Vendor

SonicWALL

Name

SMA100

License

commercial

Website

Vendor: https://www.sonicwall.com/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.4

VulDB Base Score: 6.3
VulDB Temp Score: 6.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Os command injection
CWE: CWE-78 / CWE-77 / CWE-74
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Attacked

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍
KEV Notice: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 235817
Nessus Name: SonicWall Secure Mobile Access DoS (SNWLID-2021-0022)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

12/17/2020 🔍
09/28/2021 +284 days 🔍
09/28/2021 +0 days 🔍
05/13/2025 +1323 days 🔍

Sourcesinfo

Vendor: sonicwall.com

Advisory: SNWLID-2021-0022
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-20035 (🔍)
GCVE (CVE): GCVE-0-2021-20035
GCVE (VulDB): GCVE-100-183461
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 09/28/2021 09:38
Updated: 05/13/2025 19:11
Changes: 09/28/2021 09:38 (38), 10/03/2021 09:14 (2), 10/03/2021 09:18 (1), 04/16/2025 21:14 (33), 04/16/2025 21:35 (13), 05/13/2025 19:11 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.