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CVE-2025-20393 is a critical remote command execution vulnerability in Cisco AsyncOS Software affecting Cisco Secure Email Gateway and Cisco Secure Email and Web Manager. The flaw resides in the Spam Quarantine feature and is caused by insufficient validation of HTTP requests. Cisco states that a remote, unauthenticated attacker can exploit the issue by sending a crafted HTTP request to an affected appliance. Additional technical reporting indicates the vulnerable code path is in the End User Quarantine RPC handling, where improper validation of length fields can enable authentication bypass and unsafe deserialization, ultimately resulting in arbitrary command execution. Successful exploitation results in execution of attacker-controlled system commands on the underlying operating system with root privileges.
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No valid public exploits. Mallory filtered out 10 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
253 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A specific vulnerability in Cisco Secure Email Gateway that Talos says was exploited in engagements during Q1 2026 as part of vulnerable or exposed infrastructure weaknesses.
A Cisco vulnerability in Email Security Gateway and Secure Email and Web Manager devices that the content states was leveraged by attackers as a zero-day.
Critical vulnerability in Cisco AsyncOS reported as exploited in real-world attacks and attributed to a China-nexus APT actor (no further technical details provided in the content snippet).
Cisco AsyncOS vulnerability exploited as a zero-day by a China-linked APT, enabling RCE (details truncated).
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.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.