TCP session disruption via NAT mapping replacement
Published May 28, 2024 · Updated Feb 13, 2025
TCP session hijacking in Linksys E5600 Firmware allows attackers on the same Wi-Fi network to interrupt routed TCP connections. The router preserves NAT source ports, accepts spoofed packets without strict reverse-path validation, and omits TCP-window checks, letting forged resets evict a victim mapping and attacker traffic replace it. The attacker must share the victim's Wi-Fi network and target an existing TCP flow; successful exploitation can close the connection or redirect server traffic.
Summary
What happened
TCP session hijacking in Linksys E5600 Firmware allows attackers on the same Wi-Fi network to interrupt routed TCP connections. The router preserves NAT source ports, accepts spoofed packets without strict reverse-path validation, and omits TCP-window checks, letting forged resets evict a victim mapping and attacker traffic replace it. The attacker must share the victim's Wi-Fi network and target an existing TCP flow; successful exploitation can close the connection or redirect server traffic.
The record
- CVE
- CVE-2023-30305
- Published
- May 28, 2024
- Updated
- Feb 13, 2025
- Vendor
- Linksys
- Product
- E5600 Firmware
- Classifications
- Unavailable
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 28, 2024CVE publishedPublication date reported by the CVE source.
- Feb 13, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <*
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
No sourced classifications are available.
Public exploit references
- Exploiting Sequence Number Leakage proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo