CVE-2023-30307
📋 TL;DR
This vulnerability in specific TP-LINK routers allows attackers to hijack TCP sessions by exploiting sequence number leakage in NAT-enabled Wi-Fi networks. Attackers can disrupt legitimate connections, potentially causing denial of service. Users of affected TP-LINK router models are at risk.
💻 Affected Systems
- TP-LINK TL-R473GP-AC
- TP-LINK XDR6020
- TP-LINK TL-R479GP-AC
- TP-LINK TL-R4239G
- TP-LINK TL-WAR1200L
- TP-LINK TL-R476G
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete disruption of network services, unauthorized access to sensitive data in transit, and persistent network instability affecting all connected devices.
Likely Case
Intermittent connection drops, degraded network performance, and disruption of specific TCP-based services like web browsing or file transfers.
If Mitigated
Minimal impact with proper network segmentation, intrusion detection, and updated firmware.
🎯 Exploit Status
Exploitation requires network access and understanding of TCP sequence prediction; research paper provides technical details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified
Vendor Advisory: Not provided in references
Restart Required: Yes
Instructions:
1. Check TP-LINK website for firmware updates for your specific router model. 2. Download and install the latest firmware via the router's web interface. 3. Reboot the router after installation.
🔧 Temporary Workarounds
Disable Wi-Fi and use wired connections only
allReduces attack surface by eliminating wireless attack vectors.
Implement network segmentation
allIsolate critical devices on separate VLANs to limit lateral movement.
🧯 If You Can't Patch
- Replace affected routers with models from different vendors that are not vulnerable.
- Deploy intrusion detection/prevention systems to monitor for TCP hijacking attempts.
🔍 How to Verify
Check if Vulnerable:
Check your router model and firmware version against TP-LINK's security advisories.Check Version:
Log into router web interface and navigate to System Tools > Firmware Upgrade to view current version.Verify Fix Applied:
Verify firmware version has been updated to a version not listed in vulnerability reports.📡 Detection & Monitoring
Log Indicators:
- Unusual TCP resets
- Multiple failed connection attempts from same source
- Sequence number anomalies in packet captures
Network Indicators:
- Unexpected TCP session terminations
- Spoofed TCP packets with manipulated sequence numbers
SIEM Query:
source="router_logs" AND (event="TCP_RESET" OR event="CONNECTION_HIJACK")