CVE-2024-11185
📋 TL;DR
This vulnerability in Arista EOS allows Layer 2 traffic to improperly cross VLAN boundaries, breaking network segmentation. It affects Arista switches running vulnerable EOS versions, potentially exposing sensitive network traffic to unauthorized segments.
💻 Affected Systems
- Arista EOS
⚠️ 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 VLAN segmentation failure allowing attackers to intercept sensitive traffic between different security zones, potentially accessing management networks, financial systems, or other critical infrastructure.
Likely Case
Limited VLAN boundary violations where some traffic leaks between adjacent VLANs, potentially exposing internal services or allowing lateral movement within the network.
If Mitigated
Minimal impact if proper network segmentation controls, monitoring, and defense-in-depth are already implemented to detect and contain such failures.
🎯 Exploit Status
Exploitation requires specific network conditions and Layer 2 access. No public exploit code known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific fixed versions
Vendor Advisory: https://www.arista.com/en/support/advisories-notices/security-advisory/21411-security-advisory-0118
Restart Required: Yes
Instructions:
1. Review vendor advisory for affected versions. 2. Download and apply appropriate EOS update. 3. Schedule maintenance window for switch reboot. 4. Verify VLAN isolation after update.
🔧 Temporary Workarounds
Implement ACL-based VLAN isolation
allAdd additional access control lists to enforce VLAN boundaries at Layer 3
ip access-list extended VLAN-ISOLATION
deny ip any any vlan X
permit ip any any
Enable strict VLAN tagging
allConfigure ports to drop untagged frames and enforce explicit VLAN membership
switchport mode trunk
switchport trunk allowed vlan X
switchport nonegotiate
🧯 If You Can't Patch
- Implement network monitoring to detect VLAN boundary violations
- Segment critical VLANs using physical separation or additional firewall rules
🔍 How to Verify
Check if Vulnerable:
Check EOS version against vendor advisory and test VLAN isolation with controlled traffic between VLANsCheck Version:
show version | include Software image versionVerify Fix Applied:
After patching, perform VLAN isolation testing with traffic generators to confirm no cross-VLAN leakage📡 Detection & Monitoring
Log Indicators:
- Unexpected MAC address movements between VLANs
- ARP entries appearing in wrong VLAN tables
- Interface error counters for VLAN mismatches
Network Indicators:
- Traffic appearing on VLANs where it shouldn't exist
- MAC addresses visible across multiple VLANs
- Unexpected broadcast/multicast propagation
SIEM Query:
source="arista-switch" ("vlan mismatch" OR "mac move" OR "wrong vlan")