Security readout for executives and security teams
CVE-2021-20039 is a high-severity command injection flaw in SonicWall SMA100 appliances. An attacker who already has valid authentication could abuse the management interface to run arbitrary commands as the low-privileged 'nobody' user, potentially affecting confidentiality, integrity, and availability. Exposure is limited to organizations running affected SonicWall SMA100 appliances, especially where authenticated access to the management interface is available to many users or reachable from untrusted networks. Treat as high priority for affected SMA100 deployments because VPN and secure access appliances are sensitive perimeter infrastructure, and authenticated compromise can still create serious business impact. Mitigation focus: Inventory SMA100 models and firmware against the affected version list.; Follow SonicWall PSIRT SNWLID-2021-0026 for fixed firmware and vendor guidance.; Limit management interface reachability to trusted administrative networks..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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CWE-78: Command execution behavior lookup
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Open ATT&CK lookupCVE-2021-20039 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
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CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026CVE reference · x_refsource_CONFIRM
- https://attackerkb.com/topics/9szJhq46lw/cve-2021-20039/rapid7-analysisCVE reference · exploit
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.