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CVE-2021-20035 (GCVE-0-2021-20035)

Vulnerability from cvelistv5 – Published: 2021-09-27 17:20 – Updated: 2025-10-21 23:25
VLAI CISA Previdian
Summary
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.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-17 03:55 UTC
CWE
  • CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Assigner
References
Impacted products
Vendor Product Version CPE status
SonicWall SMA100 Affected: 9.0.0.10-28sv and earlier
Affected: 10.2.0.7-34sv and earlier
Affected: 10.2.1.0-17sv and earlier
guessed Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 01fd93c6-19de-4895-b865-6eb5306eef01

Vulnerability ID: CVE-2021-20035

Status: Confirmed

Status Updated: 2025-04-16 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2025-04-16
Asserted: 2025-04-16
Scope
Notes: KEV entry: SonicWall SMA100 Appliances OS Command Injection Vulnerability | Affected: SonicWall / SMA100 Appliances | 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. | Due date: 2025-05-07 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0022 ; https://nvd.nist.gov/vuln/detail/CVE-2021-20035
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-78
Feed CISA Known Exploited Vulnerabilities Catalog
Product SMA100 Appliances
Due Date 2025-05-07
Date Added 2025-04-16
Vendorproject SonicWall
Vulnerabilityname SonicWall SMA100 Appliances OS Command Injection Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 12:26 UTC | Updated: 2026-02-06 07:17 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: bed89794-909f-4d81-b31d-924f3a5543e6

Vulnerability ID: CVE-2021-20035

Status: Confirmed

Status Updated: 2025-04-16 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2025-04-16
Asserted: 2025-04-16
Scope
Notes: KEVIntel entry: Improper neutralization of special elements in the SMA100 management interface allows a remote authenticated attacker to inject arbitrary commands... | Affected: SonicWall / SMA100 | CVSS: 6.5 (MEDIUM) | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title Improper neutralization of special elements in the SMA100 management interface allows a remote authenticated attacker to inject arbitrary commands...
Vendor SonicWall
Product SMA100
Added Date 2025-04-16T00:00:00.000Z
Cvss Score 6.5
Epss Score None
Cvss Severity MEDIUM
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:06 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
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}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.