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Analyze » Arista Networks » ARICIS1781094274

Incident Score: Analysis & Impact (ARICIS1781094274)

The details regarding individual company incidents & reports gives you full view from every side.

Rankiteo Score Impact Analysis

Rankiteo Incident Impact-2
Company Score Before Incident828 / 1000
Company Score After Incident826 / 1000
Company LinkView Arista Networks Profile
INCIDENT NUMBERARICIS1781094274
Type of Cyber IncidentVulnerability
ATTACK VECTORNetwork-based exploitation of improper tunnel protocol verification
DATA EXPOSEDNA
INCIDENT DATE30/04/2026
STATUSOngoing

Key Highlights From The Incident Analysis

  • Timeline of Arista Networks's Vulnerability and lateral movement inside company's environment.
  • Overview of affected data sets, including SSNs and PHI, and why they materially increase incident severity.
  • How Rankiteo’s incident engine converts technical details into a normalized incident score.
  • How this cyber incident impacts Arista Networks Rankiteo cyber scoring and cyber rating.
  • Rankiteo’s MITRE ATT&CK correlation analysis for this incident, with associated confidence level.

Full Incident Analysis Transcript

In this Rankiteo incident briefing, we review the Arista Networks breach identified under incident ID ARICIS1781094274.

The analysis begins with a detailed overview of Arista Networks's information like the linkedin page: https://www.linkedin.com/company/arista-networks-inc, the number of followers: 551527, the industry type: Computer Networking Products and the number of employees: 5445 employees

After the initial compromise, the video explains how Rankiteo's incident engine converts technical details into a normalized incident score. The incident score before the incident was 828 and after the incident was 826 with a difference of -2 which is could be a good indicator of the severity and impact of the incident.

In the next step of the video, we will analyze in more details the incident and the impact it had on Arista Networks and their customers.

Arista Networks recently reported "Zero-Day Exploit in Arista EOS Remains Unpatched as Hackers Target Network Devices", a noteworthy cybersecurity incident.

Hackers are actively exploiting a zero-day vulnerability in Arista Extensible Operating System (EOS), a Linux-based network OS used in high-performance switches for data centers, cloud, and enterprise environments.

The disruption is felt across the environment, affecting Arista EOS devices configured as tunnel endpoints (7020R, 7280R/R2, 7500R/R2, 7280R3, 7500R3, 7800R3 series).

In response, moved swiftly to contain the threat with measures like Mitigation instructions provided by Arista (no patches or hotfixes).

The case underscores how Ongoing, with advisories going out to stakeholders covering Mitigation instructions provided by Arista for affected users.

Finally, we try to match the incident with the MITRE ATT&CK framework to see if there is any correlation between the incident and the MITRE ATT&CK framework.

The MITRE ATT&CK framework is a knowledge base of techniques and sub-techniques that are used to describe the tactics and procedures of cyber adversaries. It is a powerful tool for understanding the threat landscape and for developing effective defense strategies.

MITRE ATT&CK® Correlation Analysis

Rankiteo's analysis has identified several MITRE ATT&CK tactics and techniques associated with this incident, each with varying levels of confidence based on available evidence. Under the Initial Access tactic, the analysis identified Exploit Public-Facing Application (T1190) with high confidence (90%), supported by evidence indicating hackers are actively exploiting a zero-day vulnerability in Arista EOS and Exploitation of Remote Services (T1210) with moderate to high confidence (80%), supported by evidence indicating network-based exploitation of improper tunnel protocol verification. Under the Privilege Escalation tactic, the analysis identified Abuse Elevation Control Mechanism (T1548) with moderate to high confidence (70%), supported by evidence indicating unauthorized decapsulation of non-configured tunnel traffic. Under the Lateral Movement tactic, the analysis identified Adversary-in-the-Middle (T1557) with moderate confidence (60%), supported by evidence indicating devices set to decapsulate one tunnel type may incorrectly process other protocols. Under the Defense Evasion tactic, the analysis identified Disable or Modify System Firewall (T1562.004) with moderate confidence (50%), supported by evidence indicating no patches or hotfixes will be released, citing risk of disrupting configurations. Under the Impact tactic, the analysis identified Network Denial of Service (T1498) with moderate to high confidence (70%), supported by evidence indicating potential network disruption due to unauthorized decapsulation of tunnel traffic. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.

Initial Access
Exploit Public-Facing Application (90%)
Exploitation of Remote Services (80%)
Privilege Escalation
Abuse Elevation Control Mechanism (70%)
Lateral Movement
Adversary-in-the-Middle (60%)
Defense Evasion
Disable or Modify System Firewall (50%)
Impact
Network Denial of Service (70%)

Sources & References