CVE-2023-30310

TCP session termination via unchecked NAT state transitions

Published May 28, 2024 · Updated Feb 13, 2025

TCP session hijacking in COMFAST CF-616AC routers allows attackers on the same Wi-Fi network to terminate client connections. The router preserves NAT source ports, accepts spoofed traffic without strict reverse-path validation, and fails to validate TCP sequence numbers before forged RST packets move a victim mapping into the CLOSE state. An active victim TCP flow and shared Wi-Fi access are required; the demonstrated availability impact is forced connection termination rather than a device crash or reboot.

CVSS severity7.5
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

TCP session hijacking in COMFAST CF-616AC routers allows attackers on the same Wi-Fi network to terminate client connections. The router preserves NAT source ports, accepts spoofed traffic without strict reverse-path validation, and fails to validate TCP sequence numbers before forged RST packets move a victim mapping into the CLOSE state. An active victim TCP flow and shared Wi-Fi access are required; the demonstrated availability impact is forced connection termination rather than a device crash or reboot.

The record

CVE
CVE-2023-30310
Published
May 28, 2024
Updated
Feb 13, 2025
Vendor
COMFAST
Product
CF-616AC
Classifications
T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 28, 2024CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <*

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

COMFAST · CF-616ACversion=0 <*

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

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No observations available

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

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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