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Vulnerability record · CVE-2023-34367 · published 14 June 2023

CVE-2023-34367: Microsoft windows 7 improper authentication vulnerability

Microsoft · Windows 7

Windows 7 is vulnerable to a full blind TCP/IP hijacking attack. The vulnerability exists in Windows 7 (any Windows until Windows 8) and in any implementation of TCP/IP, which is vulnerable to the Idle scan attack (including many IoT devices). NOTE: The vendor considers this a low severity issue.

6.5 CVSS 3.1 Medium EPSS 1.2% · top 32.1% CWE-287 · Improper authentication
6.5CVSS 3.1 base score
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

Windows 7 is vulnerable to a full blind TCP/IP hijacking attack. The vulnerability exists in Windows 7 (any Windows until Windows 8) and in any implementation of TCP/IP, which is vulnerable to the Idle scan attack (including many IoT devices). NOTE: The vendor considers this a low severity issue.

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

Affected products

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

References

LinkTags
http://blog.pi3.com.pl/?p=850 ExploitTechnical DescriptionThird Party Advisory
https://portswigger.net/daily-swig/blind-tcp-ip-hijacking-is-resurrected-for-windows-7 ExploitTechnical Description
https://pwnies.com/windows-7-blind-tcp-ip-hijacking/ Third Party Advisory
http://blog.pi3.com.pl/?p=850 ExploitTechnical DescriptionThird Party Advisory
https://portswigger.net/daily-swig/blind-tcp-ip-hijacking-is-resurrected-for-windows-7 ExploitTechnical Description
https://pwnies.com/windows-7-blind-tcp-ip-hijacking/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2023-34367), CISA KEV, FIRST EPSS (scores of 2026-10-10). This page is refreshed as NVD updates the record.