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CVE-2024-20401 is an arbitrary file-overwrite vulnerability in the content scanning and message filtering functionality of Cisco Secure Email Gateway. Improper handling of crafted email attachments permits an unauthenticated remote attacker to cause an affected appliance to overwrite arbitrary files on its underlying operating system by sending a malicious attachment through the gateway. The issue affects vulnerable Cisco AsyncOS deployments when file analysis or content-filtering functionality is enabled under the affected conditions.
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What an attacker gets, and what they’ve been doing with it.
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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.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical file-handling flaw in Cisco Secure Email Gateway that allows a remote unauthenticated attacker to send specially crafted email attachments to modify arbitrary files, potentially leading to code execution, root-level user creation, unauthorized system changes, or denial of service under specific configuration conditions.
A critical Cisco Secure Email Gateway vulnerability (CVSS 9.8) that lets an unauthenticated attacker send a specially crafted email attachment to create root users, alter appliance configuration, execute arbitrary code, or cause persistent denial of service.
Critical arbitrary file write vulnerability in Cisco Secure Email Gateway (AsyncOS) exploitable via crafted email attachments, enabling file replacement on the underlying filesystem and leading to root user creation, configuration modification, arbitrary code execution, or permanent DoS.
A critical unauthenticated remote arbitrary file overwrite vulnerability in Cisco Secure Email Gateway that can lead to root user creation, configuration modification, arbitrary code execution, or permanent denial of service.
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.