CISA KEV · Known exploitedMedium

CVE-2021-20035

SonicWall SMA100 Appliances

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
6.5
EPSS
4.18%
89.9% percentile
CISA KEV
Listed
Published
2021.09.28
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability4.18%
Technical severityCVSS 6.5

Vulnerability overview

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.

Affected product and versions

Product
SonicWall SMA100 Appliances
Affected versions
9.0.0.10-28sv and earlier, 10.2.0.7-34sv and earlier, 10.2.1.0-17sv and earlier, < 9.0.0.11-31sv, >= 10.2.0.0 < 10.2.0.8-37sv, >= 10.2.1.0 < 10.2.1.1-19sv
Fixed versions
9.0.0.11-31sv, 10.2.0.8-37sv, 10.2.1.1-19sv

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
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.

Due date: 2025.05.07
  1. 1
    Identify

    Confirm that SonicWall SMA100 Appliances and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
CWE-78
KEV added
2025.04.16
Ransomware use
미확인
CVE-2021-20035 — SonicWall SMA100 Appliances | SECUFOCUS NOW