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CVE-2025-20393 is a critical improper-input-validation vulnerability in the Spam Quarantine feature of Cisco AsyncOS Software for Cisco Secure Email Gateway and Cisco Secure Email and Web Manager. Insufficient validation of crafted HTTP requests permits an unauthenticated remote attacker to execute arbitrary system commands with root privileges. Technical analysis attributes exploitation to an overflow of single-byte EUQ RPC source or destination length fields, which can bypass destination-based validation and pass attacker-controlled data to unsafe Python pickle deserialization.
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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.
261 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Previously exploited CVSS 10.0 vulnerability affecting Cisco Secure Email Gateway/AsyncOS, referenced as background to the newer incident. It was exploited as a zero-day beginning in November 2025 and patched in January 2026.
A CVSS 10.0 Cisco AsyncOS zero-day affecting Secure Email Gateway and Secure Email and Web Manager appliances when Spam Quarantine was enabled and internet-exposed. It was exploited in the wild by a campaign attributed with moderate confidence to UAT-9686; mitigations preceded a patch released roughly seven weeks later.
A previously exploited critical Cisco AsyncOS vulnerability used to compromise Cisco Secure Email Gateway appliances and install persistence mechanisms.
A previously exploited zero-day vulnerability mentioned only as contextual comparison; no technical details, affected products, or remediation information are provided.
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.