CVE-2021-20022: SonicWall Email Security Unrestricted Upload of File Vulnerability

CVE-2021-20022 · Severity: critical · CVSS 7.2 · Exploited in the wild · Published 2021-11-03

SonicWall Email Security contains an unrestricted file upload vulnerability (CWE-434) that allows a post-authenticated attacker to upload arbitrary files to the remote host. This vulnerability has been observed in the wild as part of an exploit chain with CVE-2021-20021 and CVE-2021-20023 to achieve privilege escalation.

Technologies: Sonicwall Email Security. Vendors: SonicWall.

Quick answers

Is CVE-2021-20022 exploited in the wild?
Yes. CVE-2021-20022 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.
How severe is CVE-2021-20022?
Critical severity, with a CVSS score of 7.2, published 3 November 2021.
Which products and versions are affected?
SonicWall Email Security up to (excluding) 10.0.9.6103; SonicWall Hosted Email Security up to (excluding) 10.0.9.6103; SonicWall Email Security Virtual Appliance up to (excluding) 10.0.9.6105; SonicWall Email Security Appliance 3300 Firmware up to (excluding) 10.0.9.6105; and 7 more.
Is there a fix for CVE-2021-20022?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2021-20022 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2021-20022?
Check whether you run Sonicwall Email Security. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • SonicWall Email Security up to (excluding) 10.0.9.6103
  • SonicWall Hosted Email Security up to (excluding) 10.0.9.6103
  • SonicWall Email Security Virtual Appliance up to (excluding) 10.0.9.6105
  • SonicWall Email Security Appliance 3300 Firmware up to (excluding) 10.0.9.6105
  • SonicWall Email Security Appliance 4300 Firmware up to (excluding) 10.0.9.6105
  • SonicWall Email Security Appliance 5000 Firmware up to (excluding) 10.0.9.6105
  • SonicWall Email Security Appliance 5050 Firmware up to (excluding) 10.0.9.6105
  • SonicWall Email Security Appliance 7000 Firmware up to (excluding) 10.0.9.6105
  • SonicWall Email Security Appliance 7050 Firmware up to (excluding) 10.0.9.6105
  • SonicWall Email Security Appliance 8300 Firmware up to (excluding) 10.0.9.6105
  • SonicWall Email Security Appliance 9000 Firmware up to (excluding) 10.0.9.6105

Timeline

  • 2021-04-09: disclosed: NVD Published Date
  • 2021-11-03: kev added: Date added to CISA Known Exploited Vulnerabilities Catalog
  • 2021-11-03: exploited: Reported as exploited in the wild

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