EUVD-2026-80590
GHSA-hggx-69g9-vfhx
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/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
Network-reachable spoofed traffic with no auth (AV:N/AC:L/PR:N/UI:N); the failed filter forwards traffic to downstream systems (S:C, I:L), with no confidentiality or availability impact.
Primary rating from Vendor (Arista).
CVSS VectorVendor: Arista
Lifecycle Timeline
4DescriptionCVE.org
When specific platforms are using Arista EOS with a loose Unicast Reverse Path Forwarding (uRPF) configuration, certain traffic may not be subjected to the intended verification drop. Consequently, traffic that should be dropped based on these routes could still be processed and forwarded by the device.
This issue was discovered internally by Arista and the company is not aware of any malicious uses of this issue in customer networks.
AnalysisAI
Loose-mode Unicast Reverse Path Forwarding (uRPF) on certain Arista EOS platforms can fail to drop traffic that the configured source-address verification should have rejected, so packets that ought to be filtered are still processed and forwarded by the switch or router. Only devices running Arista EOS on one of the specific (unnamed) affected platforms and explicitly configured with loose uRPF are exposed - default deployments that do not enable uRPF are not affected, and there is no confidentiality or availability impact, only a loss of filter integrity. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires the affected device to be running Arista EOS on one of the specific (unenumerated) affected platforms AND configured with loose-mode Unicast Reverse Path Forwarding (uRPF); default deployments without loose uRPF are not exposed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuinely moderate-severity issue, not an inflated high-CVSS finding - the vendor score of 5.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N) is well-calibrated. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Arista is the authoritative source for fixed releases; consult Arista Security Advisory 0176 (https://www.arista.com/en/support/advisories-notices/security-advisory/24732-security-advisory-0176) for the platform-specific EOS upgrade path, since the supplied CPE does not enumerate a patched version and no exact fix version is confirmed in the available data. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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