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CVE-2026-73458

| EUVDEUVD-2026-79238 CRITICAL
Incorrect Implementation of Authentication Algorithm (CWE-303)
2026-09-15 psirt@arista.com GHSA-78f4-9r4h-vc9q
9.2
CVSS 4.0 · Vendor: arista
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Severity by source

Vendor (arista) PRIMARY
9.2 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:H/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

Primary rating from Vendor (arista) · only source for this CVE.

CVSS VectorVendor: arista

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Sep 15, 2026 - 20:42 vuln.today
CVE Published
Sep 15, 2026 - 20:17 cve.org
CRITICAL 9.2

DescriptionCVE.org

On affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detection (BFD) sessions configured, a specially crafted packet can cause the BFD session(s) to go down. This may result in undesirable network changes because various routing protocols monitor status on BFD session(s).

Analysis

On affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detection (BFD) sessions configured, a specially crafted packet can cause the BFD session(s) to go down. This may result in undesirable network changes because various routing protocols monitor status on BFD session(s).

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CVE-2026-73458 vulnerability details – vuln.today

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