CVE-2026-77190 — Security Advisory 0177
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 configu…
Published: 2026-09-16 · CVSS: 6.0 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7