CVE-2026-73436
published 2026-09-16CVE-2026-73436: On affected platforms running Arista EOS with OSPFv2 and OSPFv2 segment routing configured, a specially crafted OSPFv2 packet from an adjacent OSPF neighbor…
PriorityP429medium6.5CVSS 3.1
AVAACLPRNUINSUCNINAH
EPSS
0.23%
14.6th percentile
On affected platforms running Arista EOS with OSPFv2 and OSPFv2 segment routing configured, a specially crafted OSPFv2 packet from an adjacent OSPF neighbor may cause OSPF to restart unexpectedly.
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 – 4.34.7.1M | — |
| arista_networks | eos | 4.35.0F – 4.35.5M | — |
| arista_networks | eos | 4.36.0F – 4.36.1F | — |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvdv4.06.0MEDIUMCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/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 OSPF denial of service (WID-SEC-2026-3441)
vuldb·2026-09-17·CVSS 6.5
CVE-2026-73436 [MEDIUM] Arista EOS up to 4.36.1F OSPF denial of service (WID-SEC-2026-3441)
A vulnerability identified as critical has been detected in Arista EOS up to 4.32.x/4.33.9M/4.34.7.1M/4.35.5M/4.36.1F. This affects an unknown function of the component OSPF. This manipulation causes denial of service.
The identification of this vulnerability is CVE-2026-73436. It is possible to initiate the attack remotely. There is no exploit available.
You should upgrade the affected component.
GHSA
On affected platforms running Arista EOS with OSPFv2 and OSPFv2 segment routing configured, a specially crafted OSPFv2 packet from an adjacent OSPF neighbor may cause OSPF to restart unexpectedly.
ghsa_unreviewed·2026-09-16
CVE-2026-73436 [MEDIUM] CWE-125 On affected platforms running Arista EOS with OSPFv2 and OSPFv2 segment routing configured, a specially crafted OSPFv2 packet from an adjacent OSPF neighbor may cause OSPF to restart unexpectedly.
On affected platforms running Arista EOS with OSPFv2 and OSPFv2 segment routing configured, a specially crafted OSPFv2 packet from an adjacent OSPF neighbor may cause OSPF to restart unexpectedly.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-09-16
Published