Known Exploited Vulnerability
6.5
MEDIUM
CVE-2021-20035
SonicWall SMA100 Appliances OS Command Injection V - [Actively Exploited]
Description

Improper neutralization of special elements in the SMA100 management interface allows a remote authenticated attacker to inject arbitrary commands as a 'nobody' user which potentially leads to DoS.

INFO

Published Date :

Sept. 27, 2021, 6:15 p.m.

Last Modified :

April 17, 2025, 6:01 p.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

2.8
CISA Notification
CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

Description :

SonicWall SMA100 appliances contain an OS command injection vulnerability in the management interface that allows a remote authenticated attacker to inject arbitrary commands as a 'nobody' user, which could potentially lead to code execution.

Required Action :

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

Notes :

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0022 ; https://nvd.nist.gov/vuln/detail/CVE-2021-20035

Public PoC/Exploit Available at Github

CVE-2021-20035 has a 1 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2021-20035 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Sonicwall sma_210_firmware
2 Sonicwall sma_410_firmware
3 Sonicwall sma_200_firmware
4 Sonicwall sma_400_firmware
5 Sonicwall sma_500v
6 Sonicwall sma100_firmware
7 Sonicwall sma_210
8 Sonicwall sma_410
9 Sonicwall sma_200
10 Sonicwall sma_400
: Total Affected Vendor : 1 | Products : 10
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-20035.

URL Resource
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0022 Vendor Advisory
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0022 Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
M-e-e-n-a/crime_data_analysis

None

Python

Updated: 4 days, 9 hours ago
0 stars 0 fork 0 watcher
Born at : Dec. 8, 2024, 7:05 a.m. This repo has been linked 1 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-20035 vulnerability anywhere in the article.

  • Help Net Security
PoC exploit for critical Erlang/OTP SSH bug is public (CVE-2025-32433)

There are now several public proof-of-concept (PoC) exploits for a maximum-severity vulnerability in the Erlang/OTP SSH server (CVE-2025-32433) unveiled last week. “All users running an SSH server bas ... Read more

Published Date: Apr 22, 2025 (2 days, 15 hours ago)
CVE-2025-32433 CVE-2021-20035
  • The Register
Google's email spoofed by cunning phisherfolk who re-used DKIM creds

Infosec In Brief Email security outfit EasyDMARC recently spotted a phishing campaign that successfully spoofed Google with a sophisticated attack. As explained in a technical breakdown, the attackers ... Read more

Published Date: Apr 22, 2025 (2 days, 19 hours ago)
CVE-2025-25234 CVE-2025-25230 CVE-2025-31201 CVE-2025-31200 CVE-2021-20035
  • The Hacker News
⚡ THN Weekly Recap: iOS Zero-Days, 4Chan Breach, NTLM Exploits, WhatsApp Spyware & More

Cybersecurity / Hacking News Can a harmless click really lead to a full-blown cyberattack? Surprisingly, yes — and that's exactly what we saw in last week's activity. Hackers are getting better at hid ... Read more

Published Date: Apr 21, 2025 (3 days, 17 hours ago)
CVE-2025-1093 CVE-2025-3278 CVE-2025-2492 CVE-2025-32433 CVE-2025-31201 CVE-2025-31200 CVE-2025-24859 CVE-2025-24054 CVE-2024-43451 CVE-2021-20035
  • Cyber Security News
Cyber Security News Letter: Key Updates on Attacks, Vulnerabilities, & Data Breaches

Welcome to this week’s Cybersecurity Newsletter, where we provide the latest updates and critical insights from the swiftly changing realm of cybersecurity.This edition focuses on new threats and the ... Read more

Published Date: Apr 21, 2025 (4 days, 2 hours ago)
CVE-2025-31201 CVE-2025-31200 CVE-2025-20236 CVE-2025-30100 CVE-2025-24859 CVE-2025-24076 CVE-2025-24054 CVE-2021-20035
  • Help Net Security
Week in review: LLM package hallucinations harm supply chains, Nagios Log Server flaws fixed

Here’s an overview of some of last week’s most interesting news, articles, interviews and videos: Apple plugs zero-day holes used in targeted iPhone attacks (CVE-2025-31200, CVE-2025-31201) Apple has ... Read more

Published Date: Apr 20, 2025 (4 days, 19 hours ago)
CVE-2025-31201 CVE-2025-31200 CVE-2025-24054 CVE-2021-20035
  • security.nl
Vpn-accounts op SonicWall-gateways sinds januari doelwit van aanvallen

Vpn-accounts op SonicWall-gateways zijn sinds januari het doelwit van aanvallen, zo stelt securitybedrijf Arctic Wolf. Mogelijk combineren de aanvallers gecompromitteerde vpn-accounts met een vier jaa ... Read more

Published Date: Apr 19, 2025 (5 days, 16 hours ago)
CVE-2021-20035
  • BleepingComputer
SonicWall SMA VPN devices targeted in attacks since January

A remote code execution vulnerability affecting SonicWall Secure Mobile Access (SMA) appliances has been under active exploitation since at least January 2025, according to cybersecurity company Arcti ... Read more

Published Date: Apr 18, 2025 (6 days, 12 hours ago)
CVE-2021-20035
  • Help Net Security
Sonicwall SMA100 vulnerability exploited by attackers (CVE-2021-20035)

CVE-2021-20035, an old vulnerability affecting Sonicwall Secure Mobile Access (SMA) 100 series appliances, is being exploited by attackers. Sonicwall confirmed it by updating the original security adv ... Read more

Published Date: Apr 18, 2025 (6 days, 15 hours ago)
CVE-2025-23006 CVE-2021-20035
  • security.nl
SonicWall meldt misbruik van vier jaar oud lek in SMA100-gateways

SonicWall waarschuwt klanten voor misbruik van een vier jaar oude kwetsbaarheid in de SMA 100-gateways die het levert. Via het beveiligingslek kan een geauthenticeerde aanvaller willekeurige commando' ... Read more

Published Date: Apr 17, 2025 (1 week ago)
CVE-2021-20035
  • Cyber Security News
CISA Warns of SonicWall Command Injection Vulnerability Exploited in Wild

The Cybersecurity and Infrastructure Security Agency (CISA) has issued an urgent alert regarding a critical SonicWall vulnerability that is actively being exploited by threat actors. On April 16, 2025 ... Read more

Published Date: Apr 17, 2025 (1 week ago)
CVE-2025-23006 CVE-2021-20035
  • BleepingComputer
CISA tags SonicWall VPN flaw as actively exploited in attacks

On Wednesday, CISA warned federal agencies to secure their SonicWall Secure Mobile Access (SMA) 100 series appliances against attacks exploiting a high-severity remote code execution vulnerability. Tr ... Read more

Published Date: Apr 17, 2025 (1 week ago)
CVE-2021-20035
  • The Hacker News
CISA Flags Actively Exploited Vulnerability in SonicWall SMA Devices

Vulnerability / Network Security The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Wednesday added a security flaw impacting SonicWall Secure Mobile Access (SMA) 100 Series gateways ... Read more

Published Date: Apr 17, 2025 (1 week ago)
CVE-2021-20035
  • Daily CyberSecurity
CISA Alert: Actively Exploited SonicWall SMA100 Vulnerability

The Cybersecurity and Infrastructure Security Agency (CISA) has issued an urgent alert, adding CVE-2021-20035 to its Known Exploited Vulnerabilities (KEV) Catalog following verified evidence of active ... Read more

Published Date: Apr 17, 2025 (1 week, 1 day ago)
CVE-2021-20035

The following table lists the changes that have been made to the CVE-2021-20035 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Modified Analysis by [email protected]

    Apr. 17, 2025

    Action Type Old Value New Value
    Changed CPE Configuration AND OR cpe:2.3:h:sonicwall:sma_200:-:*:*:*:*:*:*:* OR *cpe:2.3:o:sonicwall:sma_200_firmware:*:*:*:*:*:*:*:* versions from (including) 10.2.0.0 up to (including) 10.2.0.7-34sv *cpe:2.3:o:sonicwall:sma_200_firmware:*:*:*:*:*:*:*:* versions from (including) 10.2.1.0 up to (including) 10.2.1.0-17sv *cpe:2.3:o:sonicwall:sma_200_firmware:*:*:*:*:*:*:*:* versions up to (including) 9.0.0.10-28sv AND OR cpe:2.3:h:sonicwall:sma_200:-:*:*:*:*:*:*:* OR *cpe:2.3:o:sonicwall:sma_200_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 9.0.0.11-31sv *cpe:2.3:o:sonicwall:sma_200_firmware:*:*:*:*:*:*:*:* versions from (including) 10.2.0.0 up to (excluding) 10.2.0.8-37sv *cpe:2.3:o:sonicwall:sma_200_firmware:*:*:*:*:*:*:*:* versions from (including) 10.2.1.0 up to (excluding) 10.2.1.1-19sv
    Changed CPE Configuration AND OR cpe:2.3:h:sonicwall:sma_400:-:*:*:*:*:*:*:* OR *cpe:2.3:o:sonicwall:sma_400_firmware:*:*:*:*:*:*:*:* versions from (including) 10.2.0.0 up to (including) 10.2.0.7-34sv *cpe:2.3:o:sonicwall:sma_400_firmware:*:*:*:*:*:*:*:* versions from (including) 10.2.1.0 up to (including) 10.2.1.0-17sv *cpe:2.3:o:sonicwall:sma_400_firmware:*:*:*:*:*:*:*:* versions up to (including) 9.0.0.10-28sv AND OR cpe:2.3:h:sonicwall:sma_400:-:*:*:*:*:*:*:* OR *cpe:2.3:o:sonicwall:sma_400_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 9.0.0.11-31sv *cpe:2.3:o:sonicwall:sma_400_firmware:*:*:*:*:*:*:*:* versions from (including) 10.2.0.0 up to (excluding) 10.2.0.8-37sv *cpe:2.3:o:sonicwall:sma_400_firmware:*:*:*:*:*:*:*:* versions from (including) 10.2.1.0 up to (excluding) 10.2.1.1-19sv
    Changed CPE Configuration AND OR cpe:2.3:h:sonicwall:sma_210:-:*:*:*:*:*:*:* OR *cpe:2.3:o:sonicwall:sma_210_firmware:*:*:*:*:*:*:*:* versions from (including) 10.2.1.0 up to (including) 10.2.1.0-17sv *cpe:2.3:o:sonicwall:sma_210_firmware:*:*:*:*:*:*:*:* versions from (including) 10.2.0.0 up to (including) 10.2.0.7-34sv *cpe:2.3:o:sonicwall:sma_210_firmware:*:*:*:*:*:*:*:* versions up to (including) 9.0.0.10-28sv AND OR cpe:2.3:h:sonicwall:sma_210:-:*:*:*:*:*:*:* OR *cpe:2.3:o:sonicwall:sma_210_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 9.0.0.11-31sv *cpe:2.3:o:sonicwall:sma_210_firmware:*:*:*:*:*:*:*:* versions from (including) 10.2.0.0 up to (excluding) 10.2.0.8-37sv *cpe:2.3:o:sonicwall:sma_210_firmware:*:*:*:*:*:*:*:* versions from (including) 10.2.1.0 up to (excluding) 10.2.1.1-19sv
    Changed CPE Configuration AND OR cpe:2.3:h:sonicwall:sma_410:-:*:*:*:*:*:*:* OR *cpe:2.3:o:sonicwall:sma_410_firmware:*:*:*:*:*:*:*:* versions from (including) 10.2.1.0 up to (including) 10.2.1.0-17sv *cpe:2.3:o:sonicwall:sma_410_firmware:*:*:*:*:*:*:*:* versions from (including) 10.2.0.0 up to (including) 10.2.0.7-34sv *cpe:2.3:o:sonicwall:sma_410_firmware:*:*:*:*:*:*:*:* versions up to (including) 9.0.0.10-28sv AND OR cpe:2.3:h:sonicwall:sma_410:-:*:*:*:*:*:*:* OR *cpe:2.3:o:sonicwall:sma_410_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 9.0.0.11-31sv *cpe:2.3:o:sonicwall:sma_410_firmware:*:*:*:*:*:*:*:* versions from (including) 10.2.0.0 up to (excluding) 10.2.0.8-37sv *cpe:2.3:o:sonicwall:sma_410_firmware:*:*:*:*:*:*:*:* versions from (including) 10.2.1.0 up to (excluding) 10.2.1.1-19sv
    Changed CPE Configuration OR *cpe:2.3:a:sonicwall:sma_500v:*:*:*:*:*:*:*:* versions from (including) 10.2.0.0 up to (including) 10.2.0.7-34sv *cpe:2.3:a:sonicwall:sma_500v:*:*:*:*:*:*:*:* versions from (including) 10.2.1.0 up to (including) 10.2.1.0-17sv *cpe:2.3:a:sonicwall:sma_500v:*:*:*:*:*:*:*:* versions up to (including) 9.0.0.10-28sv OR *cpe:2.3:a:sonicwall:sma_500v:*:*:*:*:*:*:*:* versions up to (excluding) 9.0.0.11-31sv *cpe:2.3:a:sonicwall:sma_500v:*:*:*:*:*:*:*:* versions from (including) 10.2.0.0 up to (excluding) 10.2.0.8-37sv *cpe:2.3:a:sonicwall:sma_500v:*:*:*:*:*:*:*:* versions from (including) 10.2.1.0 up to (excluding) 10.2.1.1-19sv
  • CVE CISA KEV Update by 9119a7d8-5eab-497f-8521-727c672e3725

    Apr. 17, 2025

    Action Type Old Value New Value
    Added Date Added 2025-04-16
    Added Due Date 2025-05-07
    Added Required Action Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
    Added Vulnerability Name SonicWall SMA100 Appliances OS Command Injection Vulnerability
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Apr. 16, 2025

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0022
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Initial Analysis by [email protected]

    Oct. 06, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:S/C:N/I:N/A:C)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
    Changed Reference Type https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0022 No Types Assigned https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0022 Vendor Advisory
    Added CWE NIST CWE-78
    Added CPE Configuration AND OR *cpe:2.3:o:sonicwall:sma_200_firmware:*:*:*:*:*:*:*:* versions up to (including) 9.0.0.10-28sv *cpe:2.3:o:sonicwall:sma_200_firmware:*:*:*:*:*:*:*:* versions from (including) 10.2.0.0 up to (including) 10.2.0.7-34sv *cpe:2.3:o:sonicwall:sma_200_firmware:*:*:*:*:*:*:*:* versions from (including) 10.2.1.0 up to (including) 10.2.1.0-17sv OR cpe:2.3:h:sonicwall:sma_200:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:sonicwall:sma_210_firmware:*:*:*:*:*:*:*:* versions up to (including) 9.0.0.10-28sv *cpe:2.3:o:sonicwall:sma_210_firmware:*:*:*:*:*:*:*:* versions from (including) 10.2.0.0 up to (including) 10.2.0.7-34sv *cpe:2.3:o:sonicwall:sma_210_firmware:*:*:*:*:*:*:*:* versions from (including) 10.2.1.0 up to (including) 10.2.1.0-17sv OR cpe:2.3:h:sonicwall:sma_210:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:sonicwall:sma_400_firmware:*:*:*:*:*:*:*:* versions up to (including) 9.0.0.10-28sv *cpe:2.3:o:sonicwall:sma_400_firmware:*:*:*:*:*:*:*:* versions from (including) 10.2.0.0 up to (including) 10.2.0.7-34sv *cpe:2.3:o:sonicwall:sma_400_firmware:*:*:*:*:*:*:*:* versions from (including) 10.2.1.0 up to (including) 10.2.1.0-17sv OR cpe:2.3:h:sonicwall:sma_400:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:sonicwall:sma_410_firmware:*:*:*:*:*:*:*:* versions up to (including) 9.0.0.10-28sv *cpe:2.3:o:sonicwall:sma_410_firmware:*:*:*:*:*:*:*:* versions from (including) 10.2.0.0 up to (including) 10.2.0.7-34sv *cpe:2.3:o:sonicwall:sma_410_firmware:*:*:*:*:*:*:*:* versions from (including) 10.2.1.0 up to (including) 10.2.1.0-17sv OR cpe:2.3:h:sonicwall:sma_410:-:*:*:*:*:*:*:*
    Added CPE Configuration OR *cpe:2.3:a:sonicwall:sma_500v:*:*:*:*:*:*:*:* versions up to (including) 9.0.0.10-28sv *cpe:2.3:a:sonicwall:sma_500v:*:*:*:*:*:*:*:* versions from (including) 10.2.0.0 up to (including) 10.2.0.7-34sv *cpe:2.3:a:sonicwall:sma_500v:*:*:*:*:*:*:*:* versions from (including) 10.2.1.0 up to (including) 10.2.1.0-17sv
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-20035 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-20035 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

26.23 }} 25.89%

score

0.95939

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
:
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Latest DB Update: Apr. 25, 2025 3:19