CVE-2026-121289 Security Advisory 0208
CriticalCVSS 9.3
- Published
- Updated
- Exploit status
- No public exploit known
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.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Arista Networks EOS | >= 4.36.0F, <= 4.36.2F | No fix listed |
| Arista Networks EOS | >= 4.35.0F, <= 4.35.6M | No fix listed |
| Arista Networks EOS | >= 4.34.0F, <= 4.34.8M | No fix listed |
| Arista Networks EOS | >= 4.33.0F, <= 4.33.10M | No fix listed |
| Arista Networks EOS | >= 4.25.1F, < 4.33.0F | 4.33.0F |
References
- www.arista.com vendor-advisory