Authenticated Command Injection in SonicWall SMA100 /cgi-bin/viewcert
CVE-2021-20039 is an authenticated command injection vulnerability in the SonicWall SMA 100 series management interface, specifically in the '/cgi-bin/viewcert' endpoint when handling POST requests. The issue is caused by improper neutralization of special elements in attacker-controlled input, allowing a remote authenticated attacker to inject arbitrary operating system commands. The vulnerability affects SMA 200, SMA 210, SMA 400, SMA 410, and SMA 500v appliances. The provided content states the flaw allows command execution via the management interface and is associated with post-authentication remote code execution behavior.
Are you exposed to this one?
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An authenticated remote code execution vulnerability in SonicWall SMA referenced as a possible exploitation vector in UNC6148 activity.
A known vulnerability in SonicWall SMA 100 series appliances that may allow remote attackers to gain unauthorized access.
An authenticated command injection vulnerability in SonicWall SMA 100 series appliances allowing command execution as root, enabling full device takeover.
Unknown
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.