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CVE-2021-27101 is an unauthenticated SQL injection vulnerability in Accellion File Transfer Appliance (FTA) 9_12_370 and earlier. The flaw is triggered by sending a specially crafted Host header in a request to the document_root.html endpoint. Available reporting indicates the vulnerable request handling permits attacker-controlled input from the Host header to reach backend SQL processing without proper neutralization. The vulnerability was actively exploited in the wild as part of broader Accellion FTA intrusion activity. In observed attacks, exploitation of this flaw enabled follow-on remote command execution on targeted devices and was used to deploy a web shell that supported command execution, data theft, and log cleanup.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
One of four zero-day vulnerabilities in a legacy file transfer appliance product exploited as an entry point in Clop-related attacks.
A critical SQL injection vulnerability in Accellion FTA exploitable via a crafted Host header.
One of several zero-day vulnerabilities in the Accellion/Kiteworks File Transfer Appliance mentioned as part of Clop's historical mass exploitation of file transfer applications.
An Accellion FTA vulnerability listed as exploited by Clop in the content, tied generally to the Accellion/Kiteworks File Transfer Appliance campaign.
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.