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Vulnerability record · CVE-2018-6390 · published 29 January 2018

CVE-2018-6390: Wps office memory buffer overflow vulnerability

Wps · Wps Office

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.

6.5 CVSS 3.1 Medium EPSS 1.1% · top 36.4% CWE-119 · Memory buffer overflow
6.5CVSS 3.1 base score, v2 4.3
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/Khwarezmia/WPS_POC/tree/master/wps_20180129 ExploitThird Party Advisory
https://github.com/Khwarezmia/WPS_POC/tree/master/wps_20180129 ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-6390), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.