CVE-2026-77190
Security Advisory 0177
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
On affected platforms running Arista EOS, an unauthenticated attacker who is network-adjacent to the switch and able to connect to a device with PIM Sparse Mode and MLAG configured, can send malformed messages that cause the Pimsm agent to terminate unexpectedly. The Pimsm agent is automatically restarted, but repeated attacks can cause the agent to restart continuously, resulting in a sustained denial of service.
| CWE | CWE-20 |
| Vendor | arista networks |
| Product | eos |
| Published | Sep 16, 2026 |
Stay Ahead of the Next One
Get instant alerts for arista networks eos
Be the first to know when new medium vulnerabilities affecting arista networks eos are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Arista Networks / EOS
4.36.0F ≤ 4.36.1F 4.35.0F ≤ 4.35.5M 4.34.2F ≤ 4.34.7M