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CVE-2021-20023: SonicWall Email Security Path Traversal Vulnerability

criticalknown exploitedCVE-2021-20023
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 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

vendor: SonicWallproduct: Email SecurityPath traversal
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.

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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-2021-20023

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-2021-20023coverage & exploitation statusNVD · CVE.org

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