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Fencer Vulns
medium 6.5

CVE-2021-20035 kev in the critical feed json

Improper neutralization of special elements in the SMA100 management interface allows a remote authenticated attacker to inject arbitrary c…

published 2021-09-27 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-7498

cvss
6.5
version 3.1, CNA
cisa kev
Exploited
added 2025-04-16
epss
4.4%
EPSS 4.4% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

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.

Patch / fix

cisa 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.

  • sonicwall sma_500v 9.0.0.11-31sv, 10.2.0.8-37sv, 10.2.1.1-19sv
  • sonicwall sma_200_firmware 9.0.0.11-31sv, 10.2.0.8-37sv, 10.2.1.1-19sv
  • sonicwall sma_210_firmware 9.0.0.11-31sv, 10.2.0.8-37sv, 10.2.1.1-19sv
  • sonicwall sma_400_firmware 9.0.0.11-31sv, 10.2.0.8-37sv, 10.2.1.1-19sv
  • sonicwall sma_410_firmware 9.0.0.11-31sv, 10.2.0.8-37sv, 10.2.1.1-19sv

Timeline

  1. Published
  2. Added to CISA KEV
  3. CISA SSVC: exploitation active
  4. CISA patch deadline

Known exploited

Added
18 mo ago
Patch by
2025-05-07 (18 mo ago)
Ransomware
Not known
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.
Vendor, product
SonicWall, SMA100 Appliances
CISA name
SonicWall SMA100 Appliances OS Command Injection Vulnerability

ATT&CK techniques

How it is exploited and what it leads to, in MITRE ATT&CK terms.

  • T1059 Command and Scripting Interpreter exploitation
  • T1078 Valid Accounts exploitation

kev release 2025-07-28, att&ck v16.1. KEV to ATT&CK mappings by the MITRE Center for Threat-Informed Defense (Mappings Explorer, Apache-2.0). © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. Terms of use

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
total
Assessed
18 mo ago

Exploit prediction

4.41% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 6.8 AV:N/AC:L/Au:S/C:N/I:N/A:C

Affected products

  • SonicWall SMA100

Classification

Weakness
  • CWE-78 Improper Neutralization of Special Elements used in an OS Command

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.