Background exploitation KEV catalog
CVE-2021-20035

SonicWall SMA100 Appliances OS Command Injection Vulnerability

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.

CheckOps priority index
3.9/10 Patch within 7 days
Severity6.5
Probability0.4
Exploitation2/5

Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.

EPSS · today 4.4% higher than 91.3% of CVEs
CVSS 3.1 6.5 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:
Exploited for 566 days 16 Apr 2025
CISA due date 07 May 2025 for US federal agencies

Exploitation probability EPSS · FIRST

05010026 Sep05 Oct15 Oct24 Oct02 Nov
EPSS probability (%)Percentile among all CVEs

Exploitation signals 2 / 5

  • KEV catalog (CISA)16 Apr 2025
  • Exploited in EUVD (ENISA)16 Apr 2025
  • Used by ransomwareno
  • EPSS above 10 %4.4%
  • No account, over the networkno

What to do

Fix

Apply the vendor’s fix as soon as it is available.

CISA guidance: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Meanwhile

Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.

Manufacturers (CRA)

Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained

Affected products

SMA100SMA100 Appliances
Affected versions
  • 10.2.1.0-17sv and earlier
  • 9.0.0.10-28sv and earlier
  • 10.2.0.7-34sv and earlier
Weaknesses (CWE)

Open source packages OSV

Affected libraries according to OSV, with fixed versions.

Timeline

  1. Published

  2. Exploitation reported (ENISA)

  3. Added to the KEV catalog

  4. CISA remediation due date

References

Other exploited vulnerabilities from the same vendor

  • CVE-2026-83549SonicWall SMA1000 Appliances OS Command Injection Vulnerability
    4.6 · Actively exploited
  • CVE-2026-83548SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability
    6.0 · Actively exploited
  • CVE-2026-15410SonicWall SMA1000 Appliances Code Injection Vulnerability
    5.6 · Actively exploited
  • CVE-2026-15409SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability
    6.6 · Actively exploited
  • CVE-2025-40602SonicWall SMA1000 Missing Authorization Vulnerability
    3.9 · Background exploitation
  • CVE-2023-44221SonicWall SMA100 Appliances OS Command Injection Vulnerability
    7.0 · Background exploitation

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Sources: CISA KEV · ENISA EUVD · FIRST EPSS · OSV. Public data aggregated by CheckOps, updated automatically. Source texts remain the property of their authors. All exploited vulnerabilities