Security Digest · Vulnerability record · Known exploited
CVE-2021-20035: SonicWall SMA100 Appliances OS Command Injection Vulnerability
Exploited in the wild (CISA KEV). 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.
CISA KEV · added 2025-04-16 CVSS 6.5 Medium EPSS 4.2% · p91
Should you act?
Exploited: patch now if you run it
CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- Yes, if you run SonicWall SMA100 Appliances. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-04-16, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-05-07; treat that as the outer limit, not the target.
- EPSS 4.2%, percentile 91: FIRST’s model estimates a 4.2% chance of exploitation activity in the next 30 days, higher than 91% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
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.
CISA’s summary
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.
Weakness type: CWE-78.
Product: SonicWall SMA100 Appliances · Assigned by: sonicwall · Published: 2021-09-27
Affected and fixed versions
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| SonicWall | SMA100 | 9.0.0.10-28sv and earlier, 10.2.0.7-34sv and earlier, 10.2.1.0-17sv and earlier |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADP | 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: low (any account)
- User interaction: none
- Scope: unchanged
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: added 2025-04-16; federal due date 2025-05-07. Known ransomware use: Unknown.
- 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.
- CISA SSVC assessment: exploitation active, automatable no, technical impact total.
- FIRST EPSS (model of 2026-10-21): 4.18% probability of exploitation activity in the next 30 days; percentile 91.
Timeline
- — CVE record published by sonicwall
- — Added to CISA’s Known Exploited Vulnerabilities catalog
- — CISA remediation deadline for US federal agencies
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vendor and project advisories, patches
- Listed in CISA KEV notes (psirt.global.sonicwall.com) psirt.global.sonicwall.com
Vulnerability records
- CVE.org record CVE-2021-20035 cve.org
- NVD entry CVE-2021-20035 nvd.nist.gov
Government
All exploited SonicWall vulnerabilities · Today’s Security Digest