What is CVE-2018-20621?

CVE-2018-20621 is a high-severity vulnerability in Microvirt Memu, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 7.8/10. Published 2019-03-13.

How severe is CVE-2018-20621?

High severity. CVSS v3 base score is 7.8 out of 10.

Is CVE-2018-20621 known to be exploited?

9 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Microvirt Memu

CVE-2018-20621

An issue was discovered in Microvirt MEmu 6.0.6. The MemuService.exe service binary is vulnerable to local privilege escalation through binary planting due to insecure permissions set at install time. This allows code to be run as NT AUTHORITY/SYSTEM.

Published 2019-03-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (58.3th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: +0.000

Affected products

Microvirt Memu — versions 6.0.6

Weakness classification (CWE)

CWE-732 — Incorrect Permission Assignment for Critical Resource

Public proof-of-concept exploits

References

github.com/RhinoSecurityLabs/CVEs/tree/master/CVE-2018-20621 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-20621?: CVE-2018-20621 is a high-severity vulnerability in Microvirt Memu, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 7.8/10. Published 2019-03-13.
How severe is CVE-2018-20621?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2018-20621 known to be exploited?: 9 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.