CVE-2021-27104

criticalknown exploitedcovered by 1 sourcefirst seen 2021-11-03

Actively exploited. CVE-2021-27104 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.

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

CSIRTS triage

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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Exploitation outlook

Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99% of all EPSS-scored CVEs.

Advisory coverage (1)

criticalexploitedCVE-2021-27104: Accellion FTA OS Command Injection Vulnerabilitycisa-kev · 2021-11-03

External references

NVD record for CVE-2021-27104

CVE.org record

CISA KEV catalog

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