CVE-2026-73458 — HIGH (8.2)

Vulnerability Description

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 Score

8.2

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

LOW

Availability

HIGH

Related Weaknesses (CWE)

CWE-303

References

https://www.arista.com/en/support/advisories-notices/security-advisory/24710-sec

FAQ

What is CVE-2026-73458?

CVE-2026-73458 is a vulnerability with a CVSS score of 8.2 (HIGH). 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 r...

How severe is CVE-2026-73458?

CVE-2026-73458 has been rated HIGH with a CVSS base score of 8.2/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-73458?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.