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CVE-2021-20023 is an arbitrary file read vulnerability in SonicWall Email Security version 10.0.9.x. The flaw allows a post-authenticated attacker to read arbitrary files from the remote host running SonicWall Email Security. Available reporting identifies the issue as affecting SonicWall Email Security deployments and distinguishes it from the related CVE-2021-20021 and CVE-2021-20022 flaws that were disclosed in the same timeframe. The vulnerability can be used after successful authentication to access files outside the intended scope of the application, exposing sensitive information stored on the underlying system.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A SonicWall Email Security (ES) vulnerability referenced only as a detection/validation label in the provided content; no technical details are discussed in this post.
A known vulnerability in SonicWall products cited as an intrusion vector used by Hello Kitty/FiveHands ransomware actors.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.