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Vulnerability record · CVE-1999-1189 · published 24 November 1999

CVE-1999-1189: Netscape communicator vulnerability

Netscape · Communicator

Buffer overflow in Netscape Navigator/Communicator 4.7 for Windows 95 and Windows 98 allows remote attackers to cause a denial of service, and possibly execute arbitrary commands, via a long argument after the ? character in a URL that references an .asp, .cgi, .html, or .pl file.

7.5 CVSS 2.0 High EPSS 2.5% · top 15.8%
7.5CVSS 2.0 base score
2.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
8References, 4 tagged exploit
16 Jun 2026Last modified by NVD

Description

Buffer overflow in Netscape Navigator/Communicator 4.7 for Windows 95 and Windows 98 allows remote attackers to cause a denial of service, and possibly execute arbitrary commands, via a long argument after the ? character in a URL that references an .asp, .cgi, .html, or .pl file.

AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

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

References

LinkTags
http://www.securityfocus.com/archive/1/36306 ExploitVendor Advisory
http://www.securityfocus.com/archive/1/36608 Vendor Advisory
http://www.securityfocus.com/bid/822 ExploitPatchVendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/7884
http://www.securityfocus.com/archive/1/36306 ExploitVendor Advisory
http://www.securityfocus.com/archive/1/36608 Vendor Advisory
http://www.securityfocus.com/bid/822 ExploitPatchVendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/7884

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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-1999-1189), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.