CVE-2018-6400: Kingsoft WPS Office Free 10.2.0.5978 allows local users to gain privileges or cause a denial of service by imp

Routine

HIGH 7.8DOWNGRADE

CVE-2018-6400 is a high-severity flaw (CVSS 7.8) affecting wps office free. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Kingsoft WPS Office Free 10.2.0.5978 allows local users to gain privileges or cause a denial of service by impersonating all the pipes through a use of \\.\pipe\WPSCloudSvr\WpsCloudSvr -- an "insecurely created named pipe." Ensures full access to Everyone users group.

Why this priority

High severity

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	0.3% (top 75%)
CISA exploited list	No
Published	2018-03-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: kingsoftstore

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

Am I affected?

Timeline

2018-03-12 21:29 UTCPublished CVE record published
2026-06-17 02:01 UTCUpdated Record last modified

kingsoftstore wps office free DOWNGRADE

Affected: 10.2.0.5978

Fixed in: no fixed release known

Safe to downgrade to: a release before 10.2.0.5978

1. Check installed version

apt-cache policy wps-office-free || rpm -q wps-office-free || wps-office-free --version

2. No fixed release: DOWNGRADE to a release before 10.2.0.5978 (Debian / Ubuntu)

apt-cache madison wps-office-free sudo apt install wps-office-free=<VERSION_BEFORE_10.2.0.5978> sudo apt-mark hold wps-office-free

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

dnf --showduplicates list wps-office-free sudo dnf downgrade wps-office-free-<VERSION_BEFORE_10.2.0.5978> sudo dnf versionlock add wps-office-free

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-2018-6400?

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

Is CVE-2018-6400 being exploited?

CVE-2018-6400 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-2018-6400 affect?

CVE-2018-6400 affects wps office free. Severity is high (CVSS 7.8). Kingsoft WPS Office Free 10.2.0.5978 allows local users to gain privileges or cause a denial of service by impersonating all the pipes through a use of \\.\pipe\WPSCloudSvr\WpsCloudSvr -- an "insecurely created named pipe." Ensures full acc

How urgent is CVE-2018-6400?

Priority 34/100. High severity

References

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