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Vulnerability record · CVE-1999-1463 · published 10 July 1997

CVE-1999-1463: Microsoft windows nt vulnerability

Microsoft · Windows Nt

Windows NT 4.0 before SP3 allows remote attackers to bypass firewall restrictions or cause a denial of service (crash) by sending improperly fragmented IP packets without the first fragment, which the TCP/IP stack incorrectly reassembles into a valid session.

5.0 CVSS 2.0 Medium EPSS 17% · top 3.1%
5.0CVSS 2.0 base score
17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
16 Jun 2026Last modified by NVD

Description

Windows NT 4.0 before SP3 allows remote attackers to bypass firewall restrictions or cause a denial of service (crash) by sending improperly fragmented IP packets without the first fragment, which the TCP/IP stack incorrectly reassembles into a valid session.

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

Affected products

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

References

LinkTags
http://www.securityfocus.com/archive/1/7219 ExploitPatchVendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/528
http://www.securityfocus.com/archive/1/7219 ExploitPatchVendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/528

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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-1999-1463), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.