EUVD-2026-80329
GHSA-j872-p7vg-jj85
Severity by source
CVSS:4.0/AV:A/AC:L/AT:P/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
Adjacent OSPF neighbor required (AV:A), no auth or interaction, config-gated but not per-attempt (AC:L), and impact is process restart affecting availability only (C:N/I:N/A:H); agrees with vendor.
Primary rating from Vendor (Arista).
CVSS VectorVendor: Arista
Lifecycle Timeline
6DescriptionCVE.org
On affected platforms running Arista EOS with OSPFv2 and OSPFv2 segment routing configured, a specially crafted OSPFv2 packet from an adjacent OSPF neighbor may cause OSPF to restart unexpectedly.
AnalysisAI
A crafted OSPFv2 packet delivered by an adjacent OSPF neighbor can force an unexpected restart of the OSPF process on Arista EOS devices that run both OSPFv2 and OSPFv2 segment routing, producing an availability-only denial of service (CVSS 6.5, AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Only deployments with segment routing enabled under OSPF are exposed, since this is not a default OSPF setting, and the attacker must already be positioned on the same routing segment or link (typically a compromised or rogue device inside the OSPF domain) rather than an arbitrary internet host. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires the target Arista EOS device to have BOTH OSPFv2 and OSPFv2 segment routing configured - segment routing is not a default OSPF setting, so this excludes deployments running plain OSPFv2 or no dynamic routing. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a moderate-severity, availability-only denial-of-service issue, not a critical breach vector. … 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 | Vendor guidance is published in Arista Security Advisory 0171 (https://www.arista.com/en/support/advisories-notices/security-advisory/24727-security-advisory-0171), which should be consulted for the exact fixed EOS releases and upgrade path; no specific fixed version number is provided in the available data, so treat the advisory as the source of truth and upgrade to the recommended maintenance release for the affected platform. … Detailed patch versions, workarounds, and compensating controls in full report. |
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