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CVE-2021-27104 is an operating system command injection vulnerability in Accellion File Transfer Appliance (FTA). It affects FTA 9_12_370 and earlier and can be triggered by a crafted POST request sent to administrative endpoints. Available reporting characterizes the flaw as remotely exploitable without authentication, allowing attacker-controlled input to reach OS command execution. The vulnerability was one of multiple Accellion FTA flaws exploited in campaigns targeting exposed FTA appliances, including activity associated with data theft and extortion operations.
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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.
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 command execution vulnerability in Accellion FTA via a crafted POST request.
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.