CVSS 4.0
6.1 mediumCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:NCVE-2026-120983 Security Advisory 0215
Medium (6.1) in arista networks eos. EPSS 0.2% estimated probability of exploitation activity in the next 30 days.
On this page
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.
Severity
CVSS 3.1
7.6 highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L- EPSS
- 0.2% estimated probability of exploitation activity in the next 30 days; 7th percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
- CISA's assessment (SSVC)
- Exploitation: none · Automatable: no · Technical impact: partial, assessed 2026-11-13. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
- CWE
- CWE-284 Improper Access Control
- OWASP Top 10
- A01:2025 Broken Access Control
- Published
- Modified
- Assigned by
- Arista (CNA)
- NVD analysis
- Awaiting analysis
- Record from
- the NVD, synced
Ask an AI about this CVE
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Explain CVE-2026-120983 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-120983?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-120983?via=ask-ai-copy as the source of truth: what is affected and which versions fix it, whether it is in CISA KEV, public exploits, and its EPSS (an internet-wide 30-day estimate of exploitation activity, not a forecast for my systems). If they give no fixed versions, use the CVE record https://cveawg.mitre.org/api/cve/CVE-2026-120983 or the vendor advisory, not third-party mirrors. Tell me how to check whether I am affected and how to verify a fix. Cite the sources and say where they are uncertain.Opens a third-party assistant; its answer is its own, not cve.bz's. The prompt holds only this CVE's id and public links.
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Affected
- arista networks:eos
Versions
From the CNA's record in the CVE List.
| Product | Affected |
|---|---|
| Arista Networks EOS | from 1.0.0 before 4.33.0F |
| Arista Networks EOS | from 4.33.0F through 4.33.9M |
| Arista Networks EOS | from 4.34.0F through 4.34.7M |
| Arista Networks EOS | from 4.35.0F through 4.35.5M |
| Arista Networks EOS | from 4.36.0F through 4.36.1F |
Attack patterns (CAPEC)
The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits. More on the page of CWE-284 (17).