CVE-2021-20026
CVE-2021-20026 is a high-severity vulnerability in Sonicwall Network Security Manager with a CVSS 3.x base score of 8.8. Its EPSS exploit-prediction score of 12% places it in the 96th percentile, indicating an elevated likelihood of exploitation. 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: 12% (96th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-78
- Affected product: Sonicwall Network Security Manager
- Published:
- Last modified:
Description
A vulnerability in the SonicWall NSM On-Prem product allows an authenticated attacker to perform OS command injection using a crafted HTTP request. This vulnerability affects NSM On-Prem 2.2.0-R10 and earlier versions.
Frequently asked questions
- What is CVE-2021-20026?
- A vulnerability in the SonicWall NSM On-Prem product allows an authenticated attacker to perform OS command injection using a crafted HTTP request. This vulnerability affects NSM On-Prem 2.2.0-R10 and earlier versions.
- How severe is CVE-2021-20026?
- CVE-2021-20026 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-2021-20026 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-20026?
- CVE-2021-20026 primarily affects Sonicwall Network Security Manager. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2021-20026?
- 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-2021-20026 published?
- CVE-2021-20026 was published on 2021-05-27 and last updated on 2026-06-17.
References
Affected products (3)
- cpe:2.3:a:sonicwall:network_security_manager:*:*:*:*:on-premises:*:*:*
- cpe:2.3:a:sonicwall:network_security_manager:2.2.0:-:*:*:on-premises:*:*:*
- cpe:2.3:a:sonicwall:network_security_manager:2.2.0:r10:*:*:on-premises:*:*:*
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