PatchTheCVECVE-2021-20022: SonicWall Email Security Unrestricted Upload of File Vulnerability
CVE-2021-20022 is a high-severity flaw (CVSS 7.2) affecting email security, email security appliance 9000 firmware, email security appliance 3300 firmware, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to upload an arbitrary file to the remote host.
Why this priority
- High severity
- EPSS top 3%: very likely to be exploited
- Exploited in the wild (CISA KEV)
- Used in ransomware campaigns
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.2 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | High |
| User interaction | None |
| EPSS exploit chance | 16.6% (top 3%) |
| CISA exploited list | Yes, fix due 2021-11-17, used in ransomware |
| Weakness | CWE-434 |
| Published | 2021-04-09 |
| Last modified | 2026-10-01 |
Last updated 2026-10-01 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Exploited Added to the CISA Known Exploited Vulnerabilities list
- Deadline CISA due date for US federal agencies to patch
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-20022?
email security: upgrade to 10.0.9.6103; email security appliance 9000 firmware: upgrade to 10.0.9.6105; email security appliance 3300 firmware: upgrade to 10.0.9.6105. Exact commands for each OS are on this page.
Is CVE-2021-20022 being exploited?
Yes. CVE-2021-20022 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.
What does CVE-2021-20022 affect?
CVE-2021-20022 affects email security, email security appliance 9000 firmware, email security appliance 3300 firmware. Severity is high (CVSS 7.2). SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to upload an arbitrary file to the remote host.
How urgent is CVE-2021-20022?
Priority 79/100. High severity; EPSS top 3%: very likely to be exploited; Exploited in the wild (CISA KEV); Used in ransomware campaigns
Software pages
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