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

criticalknown exploitedCVE-2021-20022
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
SonicWall Email Security contains an unrestricted upload of file with dangerous type vulnerability that allows a post-authenticated attacker to upload a file to the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20021 and CVE-2021-20023 to achieve privilege escalation.

CSIRTS triage

vendor: SonicWallproduct: Email SecurityRemote code execution
What
An unrestricted file upload vulnerability allows post-authenticated attackers to upload dangerous files.
Who is affected
Users of SonicWall Email Security.
Urgency
Immediate remediation is critical due to known exploitation and severity.
Action
Apply the latest security updates to SonicWall Email Security.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-20022

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-20022coverage & exploitation statusNVD · CVE.org

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