How severe is CVE-2023-34367?

CVE-2023-34367 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2023-34367 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-34367?

CVE-2023-34367 affects Microsoft Windows 7. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-34367?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-34367 published?

CVE-2023-34367 was published on 2023-06-14 and last updated on 2026-06-17.

CVE-2023-34367

CVE-2023-34367 is a medium-severity vulnerability in Microsoft Windows 7 with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Microsoft Windows 7
Published: 2023-06-14
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2023-34367?: 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.
How severe is CVE-2023-34367?: CVE-2023-34367 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2023-34367 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-34367?: CVE-2023-34367 affects Microsoft Windows 7. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-34367?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-34367 published?: CVE-2023-34367 was published on 2023-06-14 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:microsoft:windows_7:-:*:*:*:*:*:*:*

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