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CVE-2021-27104 is an operating system command injection vulnerability in Accellion File Transfer Appliance (FTA). A remote, unauthenticated attacker can execute operating system commands by submitting a specially crafted POST request to an administrative endpoint, exploiting an unauthenticated POST parameter. Affected versions are identified as FTA 9_12_370 and earlier, although an alternative version listing extends the affected range through 9_12_411. The vulnerability was exploited in attacks against Accellion FTA installations.
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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.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A command execution vulnerability in Accellion FTA accessible through an unauthenticated POST parameter. Cl0p chained it with other zero-days to deploy the DEWMODE web shell and conduct data extortion.
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.
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.