CVE-2021-27104

Accellion FTA: OS Command Injection

As of , CVE-2021-27104 in Accellion FTA is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch this week.

Exploited
Yes: CISA listed it on 3 November 2021
US federal deadline
17 November 202114 days after CISA listed it. US federal civilian agencies must fix it by then.
Used in ransomware campaigns
Known
EPSS score
0.57Higher than 99% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
EPSS when listed
Not availableCISA listed it before 4 February 2022, where the EPSS files we read begin.
Public exploit
None foundNeither Metasploit nor Exploit-DB lists one.
Fix
No vendor link in CISA's entry

What CISA says to do

Apply updates per vendor instructions.

CISA's required action

What the flaw is

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

CISA's description

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.

The CVE record's description, from mitre

CVE published
16 February 2021
Assigned by
mitre
CVSS
9.8 Critical (CVSS 3.1, from CISA-ADP)
CWE-78
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-20
Improper Input Validation
CISA SSVC, exploitation
active
CISA SSVC, automatable
no
CISA SSVC, technical impact
total

Timeline

  1. The CVE record was published.
  2. CISA added it to its list of exploited vulnerabilities.
  3. The US federal deadline to fix it.

FTA: other exploited entries

VulnerabilityProductOur groupListedDeadlineEPSS
CVE-2021-27103Server-Side Request Forgery (SSRF)Accellion FTAPatch this weekRansomware use0.11
CVE-2021-27101SQL InjectionAccellion FTAPatch this weekRansomware use0.06
CVE-2021-27102OS Command InjectionAccellion FTAPatch this weekRansomware use0.04

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