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CVE-2021-27104: Accellion FTA OS Command Injection Vulnerability

criticalknown exploitedCVE-2021-27104
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Accellion FTA contains an OS command injection vulnerability exploited via a crafted POST request to various admin endpoints.

CSIRTS triage

vendor: Accellionproduct: FTAOther
What
The vulnerability is an OS command injection exploited via crafted POST requests.
Who is affected
Deployments of Accellion FTA.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Update to the latest version of Accellion FTA.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

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

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-27104coverage & exploitation statusNVD · CVE.org

Recent advisories for Accellion FTA OS

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from CISA Known Exploited Vulnerabilities