Home / Vulnerabilities / CVE-2021-27104
CRITICAL SEVERITY Ransomware Linked
CVE-2021-27104 Accellion · FTA

Accellion FTA OS Command Injection Vulnerability

Critical Threat Advisory: This vulnerability is documented in active Ransomware campaigns. Immediate remediation required.

Technical Severity

CVSS v3.1 Metrics

CRITICAL
9.8 / 10
Minimal Risk Critical
Vector Specification
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitation Likelihood

EPSS Prediction

2.44 %
Predictive Probability
Percentile Rank
84.8 th

Documented as more likely to be exploited than 84.8% of known CVEs.

Detection Date

Nov 03, 2021

Remediation Due

Nov 17, 2021

CISA Catalog Active

Threat Analysis

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

Remediation Directive

Apply updates per vendor instructions.

External Intelligence

NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2021-27104