CVE-2018-6390

Name: CVE-2018-6390
Creator: NVD / NIST
Published: 2018-01-29T19:29:01.11+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.08%

Last modified Jun 17, 2026

CVE-2018-6390 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. The WStr::assign function in kso.dll in Kingsoft WPS Office 10.1.0.7106 and 10.2.0.5978 does not validate the size of the source memory block before an _copy call, which allows remote attackers to cause a denial of service (access violation and application crash) via a crafted (a) web page, (b) office document, or (c) .rtf file.. EPSS estimates a 1.08% chance of exploitation in the next 30 days.

Description

The WStr::assign function in kso.dll in Kingsoft WPS Office 10.1.0.7106 and 10.2.0.5978 does not validate the size of the source memory block before an _copy call, which allows remote attackers to cause a denial of service (access violation and application crash) via a crafted (a) web page, (b) office document, or (c) .rtf file.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS Probability

1.08%

60.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-119

Affected Software

Vendor	Product	Versions
Wps	Wps Office	10.1.0.7106
Wps	Wps Office	10.2.0.5978

References

https://github.com/Khwarezmia/WPS_POC/tree/master/wps_20180129Exploit, Third Party Advisory
https://github.com/Khwarezmia/WPS_POC/tree/master/wps_20180129Exploit, Third Party Advisory

Timeline

Published: Jan 29, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-6390?

How severe is CVE-2018-6390?

CVE-2018-6390 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.08% probability of exploitation in the next 30 days.

How do I fix CVE-2018-6390?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-6390?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST