CVE-2021-27101Known exploitationPublic exploitNetwork attack vector

Database key disclosure via Host-header SQL injection

Published Feb 16, 2021 · Updated Oct 21, 2025

SQL injection in Accellion FTA 9_12_370 and earlier allows remote attackers to retrieve database keys via a crafted Host header. The document_root.html endpoint incorporates attacker-controlled HTTP_HOST data into a database query without neutralizing SQL syntax. No authentication is required; recovered W keys can generate valid tokens used to reach a separate command-execution flaw, enabling file theft when the flaws are chained.

CVSS severity9.8
Critical
EPSS probability6.00%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SQL injection in Accellion FTA 9_12_370 and earlier allows remote attackers to retrieve database keys via a crafted Host header. The document_root.html endpoint incorporates attacker-controlled HTTP_HOST data into a database query without neutralizing SQL syntax. No authentication is required; recovered W keys can generate valid tokens used to reach a separate command-execution flaw, enabling file theft when the flaws are chained.

The record

CVE
CVE-2021-27101
Published
Feb 16, 2021
Updated
Oct 21, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-138, CWE-89, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 16, 2020Exploitation reportedUNC2546 exploitation of Accellion FTA
  2. Feb 16, 2021CVE publishedPublication date reported by the CVE source.
  3. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-138Improper Neutralization of Special Elements
CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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