CVE-2026-19655
published 2026-09-15CVE-2026-19655: On affected platforms running Arista EOS with Dynamic Host Configuration Protocol (DHCP) relay/snooping configured with the information option (Option 82), or…
PriorityP431medium6.5CVSS 3.1
AVAACLPRNUINSUCNINAH
EPSS
0.19%
9.4th percentile
On affected platforms running Arista EOS with Dynamic Host Configuration Protocol (DHCP) relay/snooping configured with the information option (Option 82), or with the DHCP server configured with match criteria based on the information option, an unauthenticated attacker connected to a client-facing VLAN(s) where the relay is configured can send a specially crafted packet that causes the DHCP Relay service to restart.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| 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 | — |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvdv4.07.1HIGHCVSS:4.0/AV:A/AC:L/AT:N/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 4.33.9M/4.34.7.1M/4.35.5M DHCP Relay Service input validation (WID-SEC-2026-3287)
vuldb·2026-09-17·CVSS 6.5
CVE-2026-19655 [MEDIUM] Arista EOS up to 4.33.9M/4.34.7.1M/4.35.5M DHCP Relay Service input validation (WID-SEC-2026-3287)
A vulnerability marked as critical has been reported in Arista EOS up to 4.33.9M/4.34.7.1M/4.35.5M. Affected by this issue is some unknown functionality of the component DHCP Relay Service. This manipulation causes improper input validation.
The identification of this vulnerability is CVE-2026-19655. It is possible to initiate the attack remotely. There is no exploit available.
GHSA
On affected platforms running Arista EOS with Dynamic Host Configuration Protocol (DHCP) relay/snooping configured with the information option (Option 82), or with the DHCP server configured with matc
ghsa_unreviewed·2026-09-15
CVE-2026-19655 [HIGH] CWE-20 On affected platforms running Arista EOS with Dynamic Host Configuration Protocol (DHCP) relay/snooping configured with the information option (Option 82), or with the DHCP server configured with matc
On affected platforms running Arista EOS with Dynamic Host Configuration Protocol (DHCP) relay/snooping configured with the information option (Option 82), or with the DHCP server configured with match criteria based on the information option, an unauthenticated attacker connected to a client-facing VLAN(s) where the relay is configured can send a specially crafted packet that causes the DHCP Relay service to restart.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-09-15
Published