CVE-2026-73435
published 2026-09-16CVE-2026-73435: On affected platforms running Arista EOS with Open Shortest Path First version 2 (OSPFv2) configured, a specially crafted OSPFv2 packet from an unauthenticated…
PriorityP346high8.2CVSS 3.1
AVAACLPRNUINSCCNILAH
EPSS
0.19%
7.6th percentile
On affected platforms running Arista EOS with Open Shortest Path First version 2 (OSPFv2) configured, a specially crafted OSPFv2 packet from an unauthenticated attacker on the same broadcast segment, with OSPFv2 authentication configured can cause adjacency flapping and packet loss. The disruption can affect routing across the broader OSPF domain.
Affected
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| arista_networks | eos | >= 1.0.0 < 4.33.0F | 4.33.0F |
| arista_networks | eos | 4.33.0F – 4.33.9M | — |
| arista_networks | eos | 4.34.0F – 4.34.7M | — |
| arista_networks | eos | 4.35.0F – 4.35.5M | — |
| arista_networks | eos | 4.36.0F – 4.36.1F | — |
CVSS provenance
nvdv3.18.2HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/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 OSPFv2 input validation (WID-SEC-2026-3441)
vuldb·2026-09-17·CVSS 8.2
CVE-2026-73435 [HIGH] Arista EOS up to 4.36.1F OSPFv2 input validation (WID-SEC-2026-3441)
A vulnerability categorized as critical has been discovered in Arista EOS up to 4.32.x/4.33.9M/4.34.7M/4.35.5M/4.36.1F. The impacted element is an unknown function of the component OSPFv2. The manipulation results in improper input validation.
This vulnerability was named CVE-2026-73435. The attack may be performed from remote. There is no available exploit.
It is advisable to upgrade the affected component.
GHSA
On affected platforms running Arista EOS with Open Shortest Path First version 2 (OSPFv2) configured, a specially crafted OSPFv2 packet from an unauthenticated attacker on the same broadcast segment,
ghsa_unreviewed·2026-09-16
CVE-2026-73435 [HIGH] CWE-345 On affected platforms running Arista EOS with Open Shortest Path First version 2 (OSPFv2) configured, a specially crafted OSPFv2 packet from an unauthenticated attacker on the same broadcast segment,
On affected platforms running Arista EOS with Open Shortest Path First version 2 (OSPFv2) configured, a specially crafted OSPFv2 packet from an unauthenticated attacker on the same broadcast segment, with OSPFv2 authentication configured can cause adjacency flapping and packet loss. The disruption can affect routing across the broader OSPF domain.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-09-16
Published