CVE-2026-121368
HIGH
MEDIUM
Priority: 0.05
BB Relevance:
78/100
Published: 2026-11-10
Modified: 2026-11-13
First seen: 2026-11-10
Status: active
Attack Surface
Network
Low Complexity
No Auth
No Interaction
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
None
UI:
None
S:
X
AT:
Present
VC:
None
VI:
None
VA:
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.
Weakness Classification (1)
Affected Software (12)
| Vendor | Product | Version |
|---|---|---|
| Arista Networks | EOS | 4.36.0F |
| Arista Networks | EOS | 4.35.0F |
| Arista Networks | EOS | 4.34.0F |
| Arista Networks | EOS | 4.33.0F |
| Arista Networks | EOS | 4.32.0F < 4.33.0F |
| Arista Networks | EOS | 1.0.0 < 4.32.0F |
| Arista Networks | EOS | 4.36.0F |
| Arista Networks | EOS | 4.35.0F |
| Arista Networks | EOS | 4.34.0F |
| Arista Networks | EOS | 4.33.0F |
| Arista Networks | EOS | 4.32.0F < 4.33.0F |
| Arista Networks | EOS | 1.0.0 < 4.32.0F |
References & Advisories (1)
Change History
| Field | Old Value | New Value | Detected |
|---|---|---|---|
| cvss_base | 8.6 | 8.9 | 2026-11-13T18:30 |
| cvss_base | 8.9 | 8.6 | 2026-11-13T17:30 |