CVE-2021-20022
Actively exploited. CVE-2021-20022 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching 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
- 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.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 97% of all EPSS-scored CVEs.
Advisory coverage (1)
- criticalexploitedCVE-2021-20022: SonicWall Email Security Unrestricted Upload of File Vulnerabilitycisa-kev · 2021-11-03
External references
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