CVE-2021-20023
Path Traversal — is CVE-2021-20023real, exploitable, or a false positive? Here's the community ground truth.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to read an arbitrary file on the remote host.
References
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Community ground truth
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Practitioners rate this higher than its CVSS — treat with extra caution.
Field notes & remediation
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SonicWall Email Security Path Traversal Vulnerability — 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. Listed in the CISA KEV catalog (added 2021-11-03) — confirmed exploited in the wild, not theoretical. It is linked to known ransomware campaigns. FIRST EPSS puts the chance of exploitation in the next 30 days at ~51%. Treat it as real and prioritize remediation over triage.
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Required action for SonicWall SonicWall Email Security: Apply updates per vendor instructions. CISA set a federal remediation due date of 2021-11-17. After patching, verify the vulnerable path is no longer reachable before closing the finding.
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