CVE-2025-8760
📋 TL;DR
A buffer overflow vulnerability in INSTAR IP camera firmware allows remote attackers to execute arbitrary code by sending specially crafted Authorization headers. This affects INSTAR 2K+ and 4K cameras running vulnerable firmware versions. Attackers can exploit this without authentication to potentially take full control of affected devices.
💻 Affected Systems
- INSTAR 2K+
- INSTAR 4K
⚠️ 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
Remote code execution leading to complete device compromise, lateral movement to internal networks, and persistent backdoor installation.
Likely Case
Remote code execution resulting in device takeover, camera feed interception, and use as botnet node.
If Mitigated
Denial of service or temporary disruption if exploit fails or controls limit impact.
🎯 Exploit Status
Buffer overflow in base64_decode function requires minimal technical skill to exploit. No authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
1. Check vendor website for firmware updates. 2. Download latest firmware. 3. Upload via web interface. 4. Reboot camera.
🔧 Temporary Workarounds
Network Segmentation
allIsolate cameras from internet and restrict internal access to management interface.
Firewall Rules
linuxBlock external access to camera management ports (typically 80, 443, 8080).
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
iptables -A INPUT -p tcp --dport 8080 -j DROP
🧯 If You Can't Patch
- Segment cameras into isolated VLAN with no internet access
- Implement strict firewall rules allowing only necessary traffic to cameras
🔍 How to Verify
Check if Vulnerable:
Check firmware version in web interface: Settings > System > Firmware UpdateCheck Version:
curl -s http://camera-ip/cgi-bin/firmware.cgi | grep versionVerify Fix Applied:
Verify firmware version is newer than 3.11.1 Build 1124📡 Detection & Monitoring
Log Indicators:
- Unusual base64 strings in Authorization headers
- fcgi_server crashes
- Multiple failed authentication attempts
Network Indicators:
- HTTP requests with malformed Authorization headers
- Traffic to camera management ports from unusual sources
SIEM Query:
source="camera_logs" AND "Authorization: Basic" AND (string_length>200 OR contains("=="))