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CVE-2021-20035

Published: Sep 27, 2021Updated: Oct 31, 2025 Sources: CVE List NVD BDUCWE-78
6.5MEDIUM
NVD MITRE
EPSS Score
3.9%
Top 11.1%
CISA KEV
Active Exploitation
Since Apr 16, 2025
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-78

Affected Products

SonicWall
commercial·US
sma 200 firmware
Networking Infrastructure
sma 210 firmware
Networking Infrastructure
sma 400 firmware
Networking Infrastructure
sma 410 firmware
Networking Infrastructure
SMA 500v
Networking Infrastructure
SMA100
Networking Infrastructure
SMA 200
Networking Infrastructure
SMA 400
Networking Infrastructure
and 4 more affected products View all →

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Apr 16, 2025
Remediation due:May 7, 2025

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.

Official Patch Available
Is your org exposed to CVE-2021-20035?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

1 technique
Execution
View detailed technique mapping

References

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0022
psirt.global.sonicwall.com
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20035
cisa.gov
https://www.cisa.gov/sites/default/files/csv/known_exploited_vulnerabilities.csv
cisa.gov

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