What is CVE-2018-6823?

CVE-2018-6823 is a critical-severity vulnerability in Mailbutler Shimo. CVSS score: 9.8/10. Published 2018-02-07.

How severe is CVE-2018-6823?

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

Vulnerability in Mailbutler Shimo

CVE-2018-6823

In the VPN client in Mailbutler Shimo before 4.1.5.1 on macOS, the com.feingeist.shimo.helper tool LaunchDaemon implements an unprotected XPC service that can be abused to execute scripts as root.

Published 2018-02-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.015 (73.0th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 73.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Mailbutler Shimo

References

github.com/VerSprite/research/blob/master/advisories/VS-2018-001.md (Third Party Advisory)

Frequently asked questions

What is CVE-2018-6823?: CVE-2018-6823 is a critical-severity vulnerability in Mailbutler Shimo. CVSS score: 9.8/10. Published 2018-02-07.
How severe is CVE-2018-6823?: Critical severity. CVSS v3 base score is 9.8 out of 10.