What is CVE-2026-73458?

CVE-2026-73458 is a high-severity vulnerability in Arista Networks Eos, classified under Incorrect Implementation of Authentication Algorithm. CVSS score: 8.2/10. Published 2026-09-15.

How severe is CVE-2026-73458?

High severity. CVSS v3 base score is 8.2 out of 10.

Vulnerability in Arista Networks Eos

CVE-2026-73458

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).

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H.

Affected products

Arista Networks Eos

Weakness classification (CWE)

CWE-303 — Incorrect Implementation of Authentication Algorithm

References

psirt@arista.com (vendor-advisory)

Frequently asked questions

What is CVE-2026-73458?: CVE-2026-73458 is a high-severity vulnerability in Arista Networks Eos, classified under Incorrect Implementation of Authentication Algorithm. CVSS score: 8.2/10. Published 2026-09-15.
How severe is CVE-2026-73458?: High severity. CVSS v3 base score is 8.2 out of 10.