What is CVE-2018-6634?

CVE-2018-6634 is a critical-severity vulnerability in Microsoft Windows, classified under Insufficient Session Expiration. CVSS score: 9.8/10. Published 2019-05-07.

How severe is CVE-2018-6634?

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

Vulnerability in Microsoft Windows

CVE-2018-6634

A vulnerability in Parsec Windows 142-0 and Parsec 'Linux Ubuntu 16.04 LTS Desktop' Build 142-1 allows unauthorized users to maintain access to an account.

Published 2019-05-07 · 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 (72.6th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 72.6% 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

Microsoft Windows
Parsecgaming Parsec — versions 142-0, 142-1
Canonical Ubuntu Linux — versions 16.04

Weakness classification (CWE)

CWE-613 — Insufficient Session Expiration

References

twitter.com/VixusFoxy/status/1125697484498583553 (Third Party Advisory)

Frequently asked questions

What is CVE-2018-6634?: CVE-2018-6634 is a critical-severity vulnerability in Microsoft Windows, classified under Insufficient Session Expiration. CVSS score: 9.8/10. Published 2019-05-07.
How severe is CVE-2018-6634?: Critical severity. CVSS v3 base score is 9.8 out of 10.