CVE-2026-121289
CRITICAL
INFO
Priority: 0.06
BB Relevance:
79/100
Published: 2026-11-10
Modified: 2026-11-13
First seen: 2026-11-10
Status: active
Attack Surface
Network
Low Complexity
No Auth
No Interaction
Conf. Impact
Integ. Impact
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
None
UI:
None
S:
X
AT:
None
VC:
High
VI:
High
VA:
High
Description
On affected platforms running Arista EOS with BGP configured, a specially crafted packet can cause the BGP agent to crash. Successful exploitation causes the BGP agent process to terminate, resulting in the loss of all BGP sessions on the affected device and possible disruption to network routing until the process recovers. Due to the nature of the vulnerability, it may also be possible for a sophisticated attacker to achieve arbitrary code execution, which could compromise the confidentiality and integrity of the affected system.
Weakness Classification (1)
Affected Software (10)
| 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 | 4.25.1F < 4.33.0F |
| 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 | 4.25.1F < 4.33.0F |
References & Advisories (1)
Change History
| Field | Old Value | New Value | Detected |
|---|---|---|---|
| cvss_base | 9.8 | 9.3 | 2026-11-13T18:30 |
| cvss_base | 9.3 | 9.8 | 2026-11-13T18:00 |