CVE-2025-7048
📋 TL;DR
This vulnerability allows attackers to disrupt network traffic by sending specially crafted packets to Arista EOS devices with MACsec configuration. The MACsec process terminates unexpectedly, and continuous attacks can cause prolonged dataplane disruption. Only Arista EOS platforms with MACsec enabled are affected.
💻 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
Sustained denial-of-service causing extended network outages and traffic disruption on affected interfaces.
Likely Case
Intermittent network instability and packet loss on MACsec-protected links during attack periods.
If Mitigated
Minimal impact with proper network segmentation and monitoring to detect and block malicious traffic.
🎯 Exploit Status
Exploitation requires sending specially crafted packets to MACsec-enabled interfaces, which is relatively straightforward for attackers with network access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Arista advisory for specific fixed versions per platform
Vendor Advisory: https://www.arista.com/en/support/advisories-notices/security-advisory/23120-security-advisory-0132
Restart Required: Yes
Instructions:
1. Review Arista advisory for fixed versions. 2. Schedule maintenance window. 3. Upgrade affected devices to patched EOS version. 4. Verify MACsec functionality post-upgrade.
🔧 Temporary Workarounds
Disable MACsec
allTemporarily disable MACsec on affected interfaces if encryption is not required
interface EthernetX
no macsec
Implement ACLs
allApply access control lists to restrict traffic to MACsec interfaces
ip access-list standard MACSEC-ACL
permit host [trusted_ip]
interface EthernetX
ip access-group MACSEC-ACL in
🧯 If You Can't Patch
- Implement strict network segmentation to isolate MACsec traffic
- Deploy network monitoring and IDS/IPS to detect and block crafted packets
🔍 How to Verify
Check if Vulnerable:
Check if device runs Arista EOS with MACsec enabled using 'show macsec' commandCheck Version:
show version | include Software image versionVerify Fix Applied:
Verify EOS version is patched per advisory and test MACsec functionality📡 Detection & Monitoring
Log Indicators:
- MACsec process crashes or restarts
- Increased interface errors on MACsec links
- System log messages about MACsec failures
Network Indicators:
- Unusual packet patterns to MACsec interfaces
- Increased retransmissions on encrypted links
- Traffic flow disruption on specific interfaces
SIEM Query:
source="arista" AND ("MACsec" OR "mka") AND ("error" OR "crash" OR "restart")