CVE-2026-120983
Security Advisory 0215
On affected EOS platforms where 802.1x is configured in multi-host authenticated mode and the device is configured with Policy Based Routing (PBR), traffic from unauthenticated hosts may be forwarded to the destination configured in the PBR policies. This could potentially allow unauthenticated hosts access to networks. Additionally Layer 2 and Layer 3 control packets from unauthenticated hosts may get copied to the CPU.
Fixes and workarounds
Workaround
ip access-list PermitAnyAcl counters per-entry 10 permit ip 20.1.1.0/24 any (Workaround: Configure the PBR policy with specific, trusted address ranges rather than broad match rules)
Source: CNA: AristaAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| EOS Arista Networks Platforms: 710 Series, 720D Series, 720XP/722XPM Series, 7010TX Series, 7320X Series, 7060X/X2/X4/X5/X6/XE7 Series, 7260X/X3 Series, 7300X/X3 Series, 7050X3/X4 Series, 750X Series, 7250 Series, 7358X4 Series, 7368X4 Series, 7388X5 Series |
≥ 1.0.0; < 4.33.0F (affected, custom) ≥ 4.33.0F; ≤ 4.33.9M (affected, custom) ≥ 4.34.0F; ≤ 4.34.7M (affected, custom) ≥ 4.35.0F; ≤ 4.35.5M (affected, custom) ≥ 4.36.0F; ≤ 4.36.1F (affected, custom) Other versions: unaffected |
CNA: Arista |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 7.6 high |
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L | CNA: Arista |
| 4.0 / 6.1 medium |
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N | CNA: Arista |
| 4.0 / 6.1 medium |
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/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 | NVD: [email protected] |
| 3.1 / 7.6 high |
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L | NVD: [email protected] |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
For agents and automation
Read public disclosures for free as Markdown or JSON. Compatible browsers also expose native WebMCP tools to search disclosures, read this page, and discover API access.
Use the ontology-linked Cyber API with x402 pay per request, or a Y2 Pro or Elite API key with the intel:cyber scope.
Endpoints and access details
https://api.y2.dev/api/v2/cyber/cveshttps://api.y2.dev/api/v2/cyber/cves/{cveId}
A workspace owner or admin can create a Pro or Elite API key. Send Authorization: Bearer <Y2_API_KEY> from your trusted agent runtime.
For x402, omit Authorization and read the HTTP 402 payment challenge before signing a retry. Public browser tools do not make payments.