Skip to main content
Mallory
HighCISA KEVExploited in the wildPublic exploit

Arbitrary File Upload in SonicWall Email Security 10.0.9.x

IdentifiersCVE-2021-20022CWE-434· Unrestricted Upload of File with…

CVE-2021-20022 is a vulnerability in SonicWall Email Security version 10.0.9.x that allows a post-authenticated attacker to upload an arbitrary file to the remote host. This flaw enables an attacker, after successful authentication, to create files of their choosing on the system, potentially leading to code execution or further compromise.

Share:
For your environment

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.

ANALYST BRIEF

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.

Successful exploitation allows a post-authenticated attacker to upload arbitrary files to the affected system. This can be leveraged to execute malicious code, establish persistence, or further escalate privileges, depending on the attacker's goals and the system configuration. The vulnerability has been exploited in the wild.

Mitigation

If you can’t patch tonight, do this now.

Apply the latest security updates from SonicWall. Ensure that only trusted users have authentication credentials. Deploy SonicWall's IPS signatures (specifically signature 15520) to detect and block exploitation attempts. For unsupported or legacy systems, upgrade to a supported version as soon as possible.

Remediation

Patch, then assume compromise.

Upgrade SonicWall Email Security to the latest patched version as provided by SonicWall. Patches have been released for all supported versions. For hosted deployments, patches were applied automatically. Legacy versions (7.0.0-9.2.2) are end-of-life and require upgrading to a supported version.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

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.

VendorProductType
SonicwallEmail Securityapplication
SonicwallEmail Security Appliance 3300 Firmwareoperating_system
SonicwallEmail Security Appliance 4300 Firmwareoperating_system
SonicwallEmail Security Appliance 5000 Firmwareoperating_system
SonicwallEmail Security Appliance 5050 Firmwareoperating_system
SonicwallEmail Security Appliance 7000 Firmwareoperating_system
SonicwallEmail Security Appliance 7050 Firmwareoperating_system
SonicwallEmail Security Appliance 8300 Firmwareoperating_system
SonicwallEmail Security Appliance 9000 Firmwareoperating_system
SonicwallEmail Security Virtual Applianceapplication
SonicwallHosted Email Securityapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

1 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.

No news coverage yet. Advisories and community discussion only.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware1

Malware families riding this exploit, with evidence and IOCs.

Detection signatures1

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity

Community discussion across Reddit, Mastodon, and other social sources.