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Known exploited vulnerability

CVE-2021-20035

mediumCVSS 3.1 6.5In CISA KEVEPSS 4.4%Published · SonicWall

The short answer

CVE-2021-20035 affects SonicWall SMA100 and is rated medium (CVSS 6.5). CISA added it to the Known Exploited Vulnerabilities catalog on 2025-04-16: attackers are using it, so patch it first.

What it is

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.

Weakness: CWE-78.

Severity

6.5 medium

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Exploited (CISA KEV)

Yes, since Apr 16, 2025

Federal due date May 7, 2025

EPSS, next 30 days

4.4%

Higher than 91% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

What CISA says to do

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

Affected products

SMA100. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2021-20035 being exploited?

Yes. CISA added CVE-2021-20035 to its Known Exploited Vulnerabilities catalog on 2025-04-16, with a federal remediation due date of 2025-05-07.

How do I fix CVE-2021-20035?

CISA's 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.

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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