CVE-2023-34367Public exploitNetwork attack vector

TCP session hijacking via global IP ID counter

Published Jun 14, 2023 · Updated Jan 6, 2025

Improper authentication in Microsoft Windows 7 allows remote attackers to hijack established TCP sessions via spoofed IP packets. The TCP/IP stack uses one global IP_ID counter, letting probes reveal response behavior while forged packets recover ports and sequence values. Exploitation requires source-address spoofing and a sufficiently quiet victim connection; successful injection can alter unencrypted session traffic.

CVSS severity6.5
Medium
EPSS probability1.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Microsoft Windows 7 allows remote attackers to hijack established TCP sessions via spoofed IP packets. The TCP/IP stack uses one global IP_ID counter, letting probes reveal response behavior while forged packets recover ports and sequence values. Exploitation requires source-address spoofing and a sufficiently quiet victim connection; successful injection can alter unencrypted session traffic.

The record

CVE
CVE-2023-34367
Published
Jun 14, 2023
Updated
Jan 6, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-287
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 6, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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