CVE-2021-20017
CVE-2021-20017 is a high-severity vulnerability in Sonicwall Sma100 Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.
Key facts
- Severity: High (CVSS 3.x base score 8.8)
- CVSS v2: 9.0
- EPSS exploit prediction: 2% (79th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-78
- Affected product: Sonicwall Sma100 Firmware
- Published:
- Last modified:
Description
A post-authenticated command injection vulnerability in SonicWall SMA100 allows an authenticated attacker to execute OS commands as a 'nobody' user. This vulnerability impacts SMA100 version 10.2.0.5 and earlier.
Frequently asked questions
- What is CVE-2021-20017?
- A post-authenticated command injection vulnerability in SonicWall SMA100 allows an authenticated attacker to execute OS commands as a 'nobody' user. This vulnerability impacts SMA100 version 10.2.0.5 and earlier.
- How severe is CVE-2021-20017?
- CVE-2021-20017 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2021-20017 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-20017?
- CVE-2021-20017 affects Sonicwall Sma100 Firmware. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-20017?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2021-20017 published?
- CVE-2021-20017 was published on 2021-03-13 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:o:sonicwall:sma100_firmware:*:*:*:*:*:*:*:*
More vulnerabilities in Sonicwall Sma100 Firmware
- CVE-2021-3450 — High (CVSS 7.4): The X509_V_FLAG_X509_STRICT flag enables additional security checks of the certificates present in a certificate chain.…
- CVE-2021-3449 — Medium (CVSS 5.9): An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a…
- CVE-2020-5132 — Medium (CVSS 5.3): SonicWall SSL-VPN products and SonicWall firewall SSL-VPN feature misconfiguration leads to possible DNS flaw known as…
- CVE-2021-20018 — Medium (CVSS 4.9): A post-authenticated vulnerability in SonicWall SMA100 allows an attacker to export the configuration file to the…
All CVEs affecting Sonicwall Sma100 Firmware →
Other CWE-78 (OS Command Injection) vulnerabilities
- CVE-2026-100382 — Critical (CVSS 10.0): Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability in Wikimedia…
- CVE-2026-77521 — Critical (CVSS 10.0): MaxKB is an open-source AI assistant for enterprise. Prior to version 2.10.5-lts, assistants with a tool, MCP tool,…
- CVE-2026-82004 — Critical (CVSS 10.0): Adobe Campaign Classic (ACC) is affected by an Improper Neutralization of Special Elements used in an OS Command ('OS…
- CVE-2026-76197 — Critical (CVSS 10.0): Adobe Campaign Classic (ACC) is affected by an Improper Neutralization of Special Elements used in an OS Command ('OS…
- CVE-2026-76195 — Critical (CVSS 10.0): Adobe Campaign Classic (ACC) is affected by an Improper Neutralization of Special Elements used in an OS Command ('OS…
- CVE-2026-19188 — Critical (CVSS 10.0): A critical OS command injection vulnerability has been identified in the Haiwell IoT Cloud HMI Gateway product. The…