Arista Networks stock at USD 205.95 on September 28, 2026, down 0.29 percent
📉 Arista Networks stock closed at USD 205.95 on September 28, 2026, reflecting a minor decline of 0.29 percent from the prior session.
🛡️ The company released a security advisory regarding vulnerabilities in EOS configurations using 802.1X authentication with ACL-based authorization.
🔧 Arista Networks recommended upgrading to remediated software versions for affected systems as no immediate hotfix was available.
📦 Arista announced the end of sales for the DCA-NDR-S100MB appliance, designating the DCA-NDR-S100MBX as the replacement model.
🤝 Customers with active support contracts for the discontinued appliance will continue to receive support per listed end-of-life milestones.
Bullish Signals
- Arista Networks confirmed that its internal discovery of security vulnerabilities has not resulted in any known malicious exploitation within customer networks.
- The company maintains a clear product roadmap by identifying the DCA-NDR-S100MBX as a direct replacement for the aging DCA-NDR-S100MB appliance.
Risk Factors
- Arista Networks disclosed specific software vulnerabilities affecting certain EOS configurations that utilize 802.1X authentication with ACL-based authorization.
- The company noted that no hotfix is currently available for the identified security issues, requiring customers to upgrade to remediated software versions.
Full Analysis
Arista Networks Inc. stock traded at USD 205.95 on September 28, 2026, marking a slight decline of 0.29 percent from the previous close of USD 206.55. The after-hours session saw the NYSE price settle without any causal link established to recent company announcements regarding product lifecycle or security advisories.
On September 9, 2026, Arista Networks issued a revised security advisory on September 22 addressing vulnerabilities in specific EOS configurations utilizing 802.1X authentication with ACL-based authorization. The company confirmed these issues were discovered internally and stated there was no evidence of malicious exploitation within customer networks at the time.
In separate business news, Arista Networks announced on September 17 that it would end sales for the DCA-NDR-S100MB appliance. The firm identified the DCA-NDR-S100MBX as the direct replacement product and confirmed that customers holding active support contracts would continue to receive service according to established end-of-life milestones.
