CVE-2026-77190
MEDIUM
NVD
CVSS Score
6.5
Severity
MEDIUM
Published
Sep 16, 2026
Vendor
unknown
Description
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.