Arista EOS gNSI Certz Service Privilege Escalation

A privileged attacker can exploit certain operation to execute arbitrary commands with root privileges, leading to full device compromise. An authenticated user can exploit gRPC Network Security Interface (gNSI) Certz service on Arista EOS-based products to escalate privileges and execute arbitrary OS commands via a crafted Certz Rotate request. The Bootz service is also affected.

Casky was already ahead

This CVE exploits attack patterns that Casky's 447matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

CVE-2026-73447 represents a critical privilege escalation vulnerability in Arista EOS-based network devices, allowing authenticated users to exploit the gRPC Network Security Interface (gNSI) Certz and Bootz services. By crafting malicious Certz Rotate requests, attackers can execute arbitrary OS commands with root privileges, resulting in complete device compromise. This vulnerability is particularly concerning for network infrastructure operators, as compromised switches or routers can serve as pivot points for lateral movement, data exfiltration, and persistent backdoors within enterprise environments. The requirement for authentication lowers the attack surface slightly but remains dangerous in scenarios involving insider threats or compromised service accounts.

Casky's platform maps this attack chain across 447 security skills aligned with MITRE ATT&CK tactics including Initial Access (TA0001), Resource Development (TA0043), and Execution (TA0002). When practitioners use Claude AI's extended reasoning capabilities, they would observe detection signals corresponding to CWE-78 (Improper Neutralization of Special Elements) manifesting as suspicious gRPC service calls, unexpected certificate rotation operations, and privilege escalation patterns. Security teams analyzing Arista EOS logs would identify credential usage by authenticated accounts followed by abnormal command execution at the root level—classic indicators of the Execution and Persistence techniques. Casky's skill correlation enables practitioners to quickly recognize this attack progression and implement compensating controls such as network segmentation, gRPC request filtering, and privileged account monitoring.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

447 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-73447.

Abuse of Public-Facing API: Mobile API Abuse

mobile security · low

Run

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

MITRE ATT&CK Techniques

TA0001 TA0043 TA0002

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