CVE-2026-77190
6.5
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Arista Networks | EOS | 4.36.0F <= 4.36.1F | affected |
| Arista Networks | EOS | 4.35.0F <= 4.35.5M | affected |
| Arista Networks | EOS | 4.34.2F <= 4.34.7M | affected |
Weaknesses
- CWE-20: CWE-20 Improper Input Validation
Workarounds
There is no mitigation or workaround available.
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
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