CVE-2020-13634: In Windows Master (aka Windows Optimization Master) 7.99.13.604, the driver file (WoptiHWDetect.SYS) allows lo

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HIGH 7.8DOWNGRADE

CVE-2020-13634 is a high-severity flaw (CVSS 7.8) affecting windows master. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Windows Master (aka Windows Optimization Master) 7.99.13.604, the driver file (WoptiHWDetect.SYS) allows local users to cause a denial of service (BSOD) or possibly have unspecified other impact because of not validating input values from IOCtl 0xF1002558

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-20
Published	2020-05-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: youhua

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

Am I affected?

Timeline

2020-05-29 17:15 UTCPublished CVE record published
2026-06-17 02:53 UTCUpdated Record last modified

youhua windows master DOWNGRADE

Affected: 7.99.13.604

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.99.13.604

1. Check installed version

apt-cache policy windows-master || rpm -q windows-master || windows-master --version

2. No fixed release: DOWNGRADE to a release before 7.99.13.604 (Debian / Ubuntu)

apt-cache madison windows-master sudo apt install windows-master=<VERSION_BEFORE_7.99.13.604> sudo apt-mark hold windows-master

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

dnf --showduplicates list windows-master sudo dnf downgrade windows-master-<VERSION_BEFORE_7.99.13.604> sudo dnf versionlock add windows-master

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-2020-13634?

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

Is CVE-2020-13634 being exploited?

CVE-2020-13634 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-2020-13634 affect?

CVE-2020-13634 affects windows master. Severity is high (CVSS 7.8). In Windows Master (aka Windows Optimization Master) 7.99.13.604, the driver file (WoptiHWDetect.SYS) allows local users to cause a denial of service (BSOD) or possibly have unspecified other impact because of not validating input values fro

How urgent is CVE-2020-13634?

Priority 40/100. High severity; Public exploit reference

Software pages

Windows vulnerabilities

References

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