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Vulnerabilities

Vulnerability · CVE-2021-27104

Accellion FTA OS Command Injection Vulnerability

Published Feb 16, 2021 · catalog updated Jun 16, 2026 · Accellion FTA

Patch now

CVE-2021-27104 is in the CISA known-exploited catalog, due Nov 17, 2021. Confirm Accellion FTA against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Critical9.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
56.69%
Remediation
Remediation guidance
Affected products
cpe accellion/fta · vendor Accellion FTA

Accellion FTA 9_12_370 and earlier is affected by OS command execution via a crafted POST request to various admin endpoints. The fixed version is FTA_9_12_380 and later.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe accellion/ftaversion unspecified
  • vendor Accellion FTAversion unspecified

How to fix CVE-2021-27104

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2021-27104 is in the CISA known-exploited catalog, due Nov 17, 2021. Confirm Accellion FTA against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply updates per vendor instructions.

What should an analyst verify?

CWE-20: Improper Input Validation; CWE-78: OS Command Injection. EPSS 56.69%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 16, 2021 · Catalog

    Detected

    Accellion FTA 9_12_370 and earlier is affected by OS command execution via a crafted POST request to various admin endpoints. The fixed version is FTA_9_12_380 and later.

  2. Nov 3, 2021 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Nov 17, 2021 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    Accellion FTA 9_12_370 and earlier is affected by OS command execution via a crafted POST request to various admin endpoints. The fixed version is FTA_9_12_380 and later.

Sources

  • CISA KEVConfirmed exploitationCVE-2021-27104

    Accellion FTA contains an OS command injection vulnerability exploited via a crafted POST request to various admin endpoints.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2021-27104

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-27104

    30-day exploitation probability 56.7%

    first.org
  • NIST NVDVulnerability recordCVE-2021-27104

    Accellion FTA 9_12_370 and earlier is affected by OS command execution via a crafted POST request to various admin endpoints. The fixed version is FTA_9_12_380 and later.

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2021-27104

    Accellion FTA contains an OS command injection vulnerability exploited via a crafted POST request to various admin endpoints.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.