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CVE-2021-20035

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

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.

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
Open in CVSS calculator →

Weaknesses

CWE-78

Affected Products

SMA100SonicWallNetworking Infrastructure
SMA 200SonicWallNetworking Infrastructure
SMA 400SonicWallNetworking Infrastructure
SMA 210SonicWallNetworking Infrastructure
SMA 410SonicWallNetworking Infrastructure
sonicwallcommercialUSNetworking Infrastructureaka sonicwall
and 7 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

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

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/sites/default/files/csv/known_exploited_vulnerabilities.csv
cisa.gov
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20035
cisa.gov

Timeline

Published
Sep 27, 2021
Added to CISA KEV
Apr 16, 2025
Last Updated
Oct 31, 2025

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