What is CVE-2017-10817?

CVE-2017-10817 is a critical-severity vulnerability in Intercom Malion, classified under Improper Authentication. CVSS score: 9.8/10. Published 2017-08-04.

How severe is CVE-2017-10817?

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

Auth bypass in Intercom Malion

CVE-2017-10817

MaLion for Windows and Mac 5.0.0 to 5.2.1 allows remote attackers to bypass authentication to alter settings in Relay Service Server.

Vulnerability class: Broken Authentication

Published 2017-08-04 · 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: 0.031 (87.4th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 87.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.031 · newest: 0.031 · change: 0.000

Affected products

Intercom Malion
Intercom, Inc. Malion For Windows And Mac — versions 5.0.0 to 5.2.1

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

www.intercom.co.jp/information/2017/0801.html (Vendor Advisory)
jvn.jp/en/vu/JVNVU91587298/index.html (VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2017-10817?: CVE-2017-10817 is a critical-severity vulnerability in Intercom Malion, classified under Improper Authentication. CVSS score: 9.8/10. Published 2017-08-04.
How severe is CVE-2017-10817?: Critical severity. CVSS v3 base score is 9.8 out of 10.