CVE-2026-121368

high

Description

On affected platforms running Arista EOS with Bidirectional Forwarding Detection (BFD) configured to use keyed MD5 or keyed SHA1 authentication, an unauthenticated attacker with network adjacency (direct or multi-hop) to a BFD-enabled interface can send a specially crafted BFD packet resulting in a system reboot.

References

https://www.arista.com/en/support/advisories-notices/security-advisory/25028-security-advisory-0206

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-122818

Details

Source: Mitre, NVD

Published: 2026-11-10

Updated: 2026-11-13

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

Severity: High

CVSS v3

Base Score: 8.6

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

Severity: High

CVSS v4

Base Score: 8.9

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H

Severity: High

EPSS

EPSS: 0.00536