CVE-2026-73444
published 2026-09-15CVE-2026-73444: On affected platforms running Arista EOS with VRRPv2 IP Authentication Header (IP-AH) authentication configured, an unauthenticated attacker with access to the…
PriorityP430medium4.7CVSS 3.1
AVAACLPRNUINSCCNINAL
EPSS
0.30%
22.8th percentile
On affected platforms running Arista EOS with VRRPv2 IP Authentication Header (IP-AH) authentication configured, an unauthenticated attacker with access to the layer 2 network segment on which VRRP is running could bypass VRRP authentication and claim the virtual router master role, enabling the attacker to intercept, modify, or discard traffic that hosts on the segment send to the virtual gateway address.
Affected
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| arista_networks | eos | — | — |
| arista_networks | eos | 4.33.0 – 4.33.9M | — |
| arista_networks | eos | 4.34.0 – 4.34.7M | — |
| arista_networks | eos | 4.35.0 – 4.35.5M | — |
| arista_networks | eos | 4.36.0 – 4.36.1F | — |
CVSS provenance
nvdv3.14.7MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
nvdv4.05.3MEDIUMCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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 4.33.9M/4.34.7M/4.35.5M/4.36.1F VRRP improper authentication (WID-SEC-2026-3287)
vuldb·2026-09-17·CVSS 4.7
CVE-2026-73444 [MEDIUM] Arista EOS up to 4.33.9M/4.34.7M/4.35.5M/4.36.1F VRRP improper authentication (WID-SEC-2026-3287)
A vulnerability marked as very critical has been reported in Arista EOS up to 4.33.9M/4.34.7M/4.35.5M/4.36.1F. Impacted is an unknown function of the component VRRP. The manipulation leads to improper authentication.
This vulnerability is traded as CVE-2026-73444. It is possible to initiate the attack remotely. There is no exploit available.
GHSA
On affected platforms running Arista EOS with VRRPv2 IP Authentication Header (IP-AH) authentication configured, an unauthenticated attacker with access to the layer 2 network segment on which VRRP is
ghsa_unreviewed·2026-09-16
CVE-2026-73444 [MEDIUM] CWE-303 On affected platforms running Arista EOS with VRRPv2 IP Authentication Header (IP-AH) authentication configured, an unauthenticated attacker with access to the layer 2 network segment on which VRRP is
On affected platforms running Arista EOS with VRRPv2 IP Authentication Header (IP-AH) authentication configured, an unauthenticated attacker with access to the layer 2 network segment on which VRRP is running could bypass VRRP authentication and claim the virtual router master role, enabling the attacker to intercept, modify, or discard traffic that hosts on the segment send to the virtual gateway address.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-09-15
Published