CVE-2018-6217: The WStr::_alloc_iostr_data() function in kso.dll in Kingsoft WPS Office 10.1.0.7106 and 10.2.0.5978 allows re

Routine

MEDIUM 5.5DOWNGRADE

CVE-2018-6217 is a medium-severity flaw (CVSS 5.5) affecting kingsoft wps office. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The WStr::_alloc_iostr_data() function in kso.dll in Kingsoft WPS Office 10.1.0.7106 and 10.2.0.5978 allows remote attackers to cause a denial of service (application crash) via a crafted (a) web page, (b) office document, or (c) .rtf file.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-20
Published	2018-01-25
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

2018-01-25 08:29 UTCPublished CVE record published
2026-06-17 02:01 UTCUpdated Record last modified

kingsoftstore kingsoft wps office DOWNGRADE

Affected: 10.1.0.7106 · 10.2.0.5978

Fixed in: no fixed release known

Safe to downgrade to: a release before 10.1.0.7106

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 10.1.0.7106 (Debian / Ubuntu)

apt-cache madison kingsoft-wps-office sudo apt install kingsoft-wps-office=<VERSION_BEFORE_10.1.0.7106> sudo apt-mark hold kingsoft-wps-office

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

dnf --showduplicates list kingsoft-wps-office sudo dnf downgrade kingsoft-wps-office-<VERSION_BEFORE_10.1.0.7106> sudo dnf versionlock add kingsoft-wps-office

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-2018-6217?

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

Is CVE-2018-6217 being exploited?

CVE-2018-6217 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-2018-6217 affect?

CVE-2018-6217 affects kingsoft wps office. Severity is medium (CVSS 5.5). The WStr::_alloc_iostr_data() function in kso.dll in Kingsoft WPS Office 10.1.0.7106 and 10.2.0.5978 allows remote attackers to cause a denial of service (application crash) via a crafted (a) web page, (b) office document, or (c) .rtf file.

How urgent is CVE-2018-6217?

Priority 39/100. Public exploit reference

References

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