---
id: "CVE-2021-27101"
kind: "vulnerability"
aliases: ["CVE-2021-27101"]
title: "Accellion FTA: Accellion FTA SQL Injection Vulnerability"
severity: "critical"
cvss: 9.8
epss: 0.05998
exploited: true
status: "open"
category: "vendor"
products: [{"name": "Accellion FTA", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["accellion-fta", "exploited", "file-transfer-appliance", "ransomware", "vendor"]
not_affected_if: ["not-accellion-fta"]
published_at: "2021-02-16T21:15:13+00:00"
first_seen_at: "2026-10-23T19:11:53+00:00"
updated_at: "2026-10-23T21:57:35+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-27101", "first_seen_at": "2026-10-23T19:11:53+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2021-27101", "first_seen_at": "2026-10-23T19:13:44+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-27101", "first_seen_at": "2026-10-23T21:57:35+00:00"}]
---

# Accellion FTA: Accellion FTA SQL Injection Vulnerability

Accellion FTA, a file transfer appliance, has a SQL injection flaw triggered by a crafted Host header in a request to document_root.html. An unauthenticated attacker can run SQL against the database, and the flaw is known to be exploited in the wild, including in ransomware campaigns.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Accellion FTA affected ? fixed ?

## Fix

Apply updates per vendor instructions (CISA required action); the specific fixed version is unknown from the sources.

## Timeline

- 2026-10-23T19:11:53+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-27101
- 2026-10-23T19:13:44+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2021-27101
- 2026-10-23T21:57:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2021-27101

## From the sources

Accellion FTA contains a SQL injection vulnerability exploited via a crafted host header in a request to document_root.html.

CISA required action: Apply updates per vendor instructions.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_