CVE-2021-20023
Actively exploited. CVE-2021-20023 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 a path traversal vulnerability that allows a post-authenticated attacker to read files on the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20021 and CVE-2021-20022 to achieve privilege escalation.
CSIRTS triage
- What
- SonicWall Email Security contains a path traversal vulnerability that allows a post-authenticated attacker to read files on the remote host.
- Who is affected
- Deployments of SonicWall Email Security.
- Urgency
- Remediation is urgent due to active exploitation and critical severity.
- Action
- Apply the latest security updates from SonicWall.
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 99% of all EPSS-scored CVEs.
Advisory coverage (1)
- criticalexploitedCVE-2021-20023: SonicWall Email Security Path Traversal Vulnerabilitycisa-kev · 2021-11-03
External references
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