CVE-2020-36603: The HoYoVerse (formerly miHoYo) Genshin Impact mhyprot2.sys 1.0.0.0 anti-cheat driver does not adequately rest

This month

MEDIUM 6.5DOWNGRADE

CVE-2020-36603 is a medium-severity flaw (CVSS 6.5) affecting mhyprot2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The HoYoVerse (formerly miHoYo) Genshin Impact mhyprot2.sys 1.0.0.0 anti-cheat driver does not adequately restrict unprivileged function calls, allowing local, unprivileged users to execute arbitrary code with SYSTEM privileges on Microsoft Windows systems. The mhyprot2.sys driver must first be installed by a user with administrative privileges.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-269
Published	2022-09-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: hoyoverse

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-09-14 22:15 UTCPublished CVE record published
2026-06-17 03:15 UTCUpdated Record last modified

hoyoverse mhyprot2 DOWNGRADE

Affected: 1.0.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0.0

1. Check installed version

apt-cache policy mhyprot2 || rpm -q mhyprot2 || mhyprot2 --version

2. No fixed release: DOWNGRADE to a release before 1.0.0.0 (Debian / Ubuntu)

apt-cache madison mhyprot2 sudo apt install mhyprot2=<VERSION_BEFORE_1.0.0.0> sudo apt-mark hold mhyprot2

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mhyprot2 sudo dnf downgrade mhyprot2-<VERSION_BEFORE_1.0.0.0> sudo dnf versionlock add mhyprot2

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-36603?

mhyprot2: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-36603 being exploited?

CVE-2020-36603 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-36603 affect?

CVE-2020-36603 affects mhyprot2. Severity is medium (CVSS 6.5). The HoYoVerse (formerly miHoYo) Genshin Impact mhyprot2.sys 1.0.0.0 anti-cheat driver does not adequately restrict unprivileged function calls, allowing local, unprivileged users to execute arbitrary code with SYSTEM privileges on Microsoft

How urgent is CVE-2020-36603?

Priority 40/100. Public exploit reference

Software pages

Windows vulnerabilities

References

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