CVE-2026-0794
📋 TL;DR
CVE-2026-0794 is a use-after-free vulnerability in ALGO 8180 IP Audio Alerter devices that allows remote attackers to execute arbitrary code without authentication by exploiting improper SIP call handling. This affects all installations of ALGO 8180 devices with vulnerable firmware. Attackers can gain full control of affected devices over the network.
💻 Affected Systems
- ALGO 8180 IP Audio Alerter
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing persistent backdoor installation, network pivoting, and disruption of emergency audio alerting systems
Likely Case
Device takeover leading to service disruption, data exfiltration, and use as foothold for lateral movement
If Mitigated
Limited impact if devices are isolated in protected network segments with strict access controls
🎯 Exploit Status
ZDI has published advisory with technical details; while no public PoC exists, the vulnerability details are sufficient for skilled attackers to develop exploits
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched firmware version
Vendor Advisory: https://www.zerodayinitiative.com/advisories/ZDI-26-016/
Restart Required: Yes
Instructions:
1. Contact ALGO vendor for patched firmware 2. Backup device configuration 3. Upload new firmware via web interface 4. Reboot device 5. Verify SIP functionality
🔧 Temporary Workarounds
Network Segmentation
allIsolate ALGO devices in separate VLAN with strict firewall rules
SIP Access Control
linuxRestrict SIP traffic to trusted sources only using firewall rules
iptables -A INPUT -p udp --dport 5060 -s trusted_ip -j ACCEPT
iptables -A INPUT -p udp --dport 5060 -j DROP
🧯 If You Can't Patch
- Segment network to isolate ALGO devices from untrusted networks
- Implement strict firewall rules to allow SIP traffic only from authorized sources
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface (typically http://device-ip) and compare against vendor patched versionCheck Version:
curl -s http://device-ip/status | grep FirmwareVerify Fix Applied:
Verify firmware version matches patched version and test SIP functionality remains operational📡 Detection & Monitoring
Log Indicators:
- Unusual SIP call patterns
- Multiple failed SIP registrations from single source
- Device reboot logs without administrative action
Network Indicators:
- SIP traffic from unexpected sources
- Unusual outbound connections from ALGO devices
- SIP packets with malformed headers
SIEM Query:
source="algo_device" AND (event="reboot" OR sip_call_count > threshold)