What is CVE-2017-8303?

CVE-2017-8303 is a critical-severity vulnerability in Accellion File Transfer Appliance, classified under Improper Encoding or Escaping of Output. CVSS score: 9.8/10. Published 2017-05-05.

How severe is CVE-2017-8303?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Accellion File Transfer Appliance

CVE-2017-8303

An issue was discovered on Accellion FTA devices before FTA_9_12_180. seos/1000/find.api allows Remote Code Execution with shell metacharacters in the method parameter.

Published 2017-05-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.242 (97.8th percentile), scored 2026-09-30.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 97.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.242 · newest: 0.242 · change: 0.000

Affected products

Accellion File Transfer Appliance

Weakness classification (CWE)

CWE-116 — Improper Encoding or Escaping of Output

References

gist.github.com/anonymous/32e2894fa29176f3f32cb2b2bb7c24cb (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2017-8303?: CVE-2017-8303 is a critical-severity vulnerability in Accellion File Transfer Appliance, classified under Improper Encoding or Escaping of Output. CVSS score: 9.8/10. Published 2017-05-05.
How severe is CVE-2017-8303?: Critical severity. CVSS v3 base score is 9.8 out of 10.