VulnerabilityAnalyzed

CVE-2021-20022

SonicWall Email Security Unrestricted Upload of File Vulnerability

KEVHIGH 7.2EPSS 16.5%

Does this matter?

Known to be exploited in the wild (CISA KEV, CISA remediation deadline 17 November 2021). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.

Description

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.

CVSS 3.1: 7.2 HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
EPSS: 16.51% probability · 97th percentile
CISA KEV: Listed 3 November 2021 · due 17 November 2021 · used in ransomware campaigns
Weakness: CWE-434
Affected: sonicwall/email security · sonicwall/email security appliance 9000 firmware · sonicwall/email security appliance 3300 firmware · sonicwall/email security appliance 4300 firmware · sonicwall/email security appliance 8300 firmware · sonicwall/email security appliance 5000 firmware · sonicwall/email security appliance 7000 firmware · sonicwall/email security appliance 5050 firmware · sonicwall/email security appliance 7050 firmware · sonicwall/email security virtual appliance · sonicwall/hosted email security
Source: PSIRT@sonicwall.com

CISA notes

Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2021-20022

References

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0008Vendor Advisory
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0008Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20022US Government Resource

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.