CVE-2026-73446
published 2026-09-16CVE-2026-73446: On affected platforms running Arista EOS with IS-IS configured on a broadcast interface, an unauthenticated attacker can send a crafted IS-IS Hello Protocol…
PriorityP342high7.4CVSS 3.1
AVAACLPRNUINSCCNINAH
EPSS
0.27%
16.8th percentile
On affected platforms running Arista EOS with IS-IS configured on a broadcast interface, an unauthenticated attacker can send a crafted IS-IS Hello Protocol Data Unit (PDU) that causes the device to tear down an established IS-IS adjacency. This may result in traffic disruption and loss of IP reachability for prefixes advertised through that adjacency.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| arista_networks | eos | >= 4.31.0 < 4.32.0F | 4.32.0F |
| arista_networks | eos | >= 4.32.0 < 4.33.0F | 4.33.0F |
| arista_networks | eos | 4.33.0 – 4.33.9M | — |
| arista_networks | eos | 4.34.0 – 4.34.7.1M | — |
| arista_networks | eos | 4.35.0 – 4.35.5M | — |
| arista_networks | eos | 4.36.0 – 4.36.1F | — |
CVSS provenance
nvdv3.17.4HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
nvdv4.07.0HIGHCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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VulDB
Arista EOS up to 4.36.1F Broadcast Interface resource consumption (WID-SEC-2026-3287)
vuldb·2026-09-17·CVSS 7.4
CVE-2026-73446 [HIGH] Arista EOS up to 4.36.1F Broadcast Interface resource consumption (WID-SEC-2026-3287)
A vulnerability classified as critical has been found in Arista EOS up to 4.36.1F. The impacted element is an unknown function of the component Broadcast Interface. Performing a manipulation results in resource consumption.
This vulnerability is cataloged as CVE-2026-73446. It is possible to initiate the attack remotely. There is no exploit available.
It is recommended to upgrade the affected component.
GHSA
On affected platforms running Arista EOS with IS-IS configured on a broadcast interface, an unauthenticated attacker can send a crafted IS-IS Hello Protocol Data Unit (PDU) that causes the device to t
ghsa_unreviewed·2026-09-16
CVE-2026-73446 [HIGH] CWE-696 On affected platforms running Arista EOS with IS-IS configured on a broadcast interface, an unauthenticated attacker can send a crafted IS-IS Hello Protocol Data Unit (PDU) that causes the device to t
On affected platforms running Arista EOS with IS-IS configured on a broadcast interface, an unauthenticated attacker can send a crafted IS-IS Hello Protocol Data Unit (PDU) that causes the device to tear down an established IS-IS adjacency. This may result in traffic disruption and loss of IP reachability for prefixes advertised through that adjacency.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-09-16
Published