CVE-2021-20026

Network Security Manager vulnerability

CVSS

8.8

EPSS

11.6%

EPSS pct

96th

Exploited

No known

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.

Affected vendor

Sonicwall

Affected product

Network Security Manager

CVSS vector

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

Weakness type (CWE)

CWE-78 — OS Command Injection

Published

2021-05-27

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring low privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 11.6% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 96% of all scored CVEs.

Check your external exposure to CVE-2021-20026

Confirm whether Sonicwall Network Security Manager is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2021-20026.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-20026

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-20026 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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