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Exploited vulnerability · CISA KEV

Is CVE-2021-20035 exploited? Yes: in CISA KEV since 16 Apr 2025

Gociux · SonicWall SMA100 Appliances · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2021-20035, SonicWall SMA100 Appliances OS Command Injection Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 16 Apr 2025, 1297 days after it was published. It affects SonicWall SMA100 Appliances, an internet-facing product of the kind attackers use for initial access. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 16 Apr 2025
ransomwareNot knownno confirmed use
EPSStop 10%more likely than most to be exploited
severity6.5CVSS 3.1 · medium
US federal due7 May 2025BOD 22-01 deadline

What it is

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.

VendorSonicWall (20 exploited CVEs in KEV)
ProductSMA100 Appliances
VulnerabilitySonicWall SMA100 Appliances OS Command Injection Vulnerability
WeaknessCWE-78
Published27 Sep 2021
Added to KEV16 Apr 2025
Reported by (CNA)sonicwall

What to do

  1. Check whether you run it. Look for SMA100 Appliances in your asset inventory, including appliances and cloud images. Stack check lists every exploited SonicWall CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 27 Sep 2021.
  4. Get told next time. Email alerts when CISA adds a CVE for SonicWall.

Other exploited CVEs in SMA100 Appliances

References

Questions

Is CVE-2021-20035 being exploited?

Yes. CISA added CVE-2021-20035 to the Known Exploited Vulnerabilities catalog on 16 Apr 2025, which means there is reliable evidence of exploitation in the wild.

Is CVE-2021-20035 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2021-20035?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check SonicWall's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected SMA100 Appliances and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in April 2025 · SonicWall scorecard · act-now radar.

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