CVE-2025-6978 Overview
CVE-2025-6978 is a command injection vulnerability in the diagnostics functionality of an Arista product. The flaw is categorized under [CWE-78] (Improper Neutralization of Special Elements used in an OS Command). An authenticated attacker with high privileges can inject operating system commands through diagnostic inputs, achieving full compromise of confidentiality, integrity, and availability on the affected device.
Critical Impact
Authenticated attackers can execute arbitrary OS commands on affected Arista devices, leading to full system compromise.
Affected Products
- Arista product covered under Arista Security Advisory #0123
- Specific affected versions are listed in the vendor advisory
- Refer to vendor advisory for complete component scope
Discovery Timeline
- 2025-10-23 - CVE-2025-6978 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-6978
Vulnerability Analysis
The vulnerability resides in a diagnostics command path that fails to properly neutralize special characters before passing user-controlled input to the underlying operating system shell. An attacker who has authenticated to the device with high privileges can supply crafted arguments that break out of the intended command context and execute arbitrary OS commands.
Successful exploitation grants the attacker the privileges of the diagnostics process, which typically runs with elevated rights on network operating systems. This allows modification of configuration, extraction of credentials, interception of traffic, or full device takeover. The EPSS score of 11.737% (95th percentile) indicates a notably higher likelihood of exploitation activity compared to most CVEs.
Root Cause
The root cause is insufficient input sanitization in the diagnostics command handler. User-supplied parameters are concatenated into a shell command string without filtering metacharacters such as ;, |, &, backticks, or $() constructs. This permits shell command chaining and substitution.
Attack Vector
The attack vector is network-based and requires authenticated access with high privileges. An attacker invokes a diagnostics command, typically through the device CLI or management interface, and embeds shell metacharacters in an argument. The diagnostics handler then dispatches the constructed string to the shell, executing the injected payload alongside the legitimate command.
No verified proof-of-concept code is publicly available. Refer to the Arista Security Advisory #0123 for vendor-supplied technical details.
Detection Methods for CVE-2025-6978
Indicators of Compromise
- Unexpected shell processes spawned as children of the diagnostics or management daemon
- Diagnostics command audit log entries containing shell metacharacters such as ;, |, &, `, or $(
- Outbound network connections originating from device management processes to unfamiliar destinations
- Unauthorized configuration changes following diagnostics command execution
Detection Strategies
- Enable command accounting and audit logging on Arista devices and forward logs to a centralized SIEM
- Alert on diagnostics command invocations that include shell control characters or unusual argument patterns
- Correlate privileged login events with subsequent diagnostics command activity to flag anomalous sequences
Monitoring Recommendations
- Forward device syslog and AAA accounting records to a SIEM or data lake for retention and analytics
- Baseline normal diagnostics command usage and alert on deviations from administrator behavior
- Monitor authentication logs for high-privilege account use from unexpected source addresses or at unusual times
How to Mitigate CVE-2025-6978
Immediate Actions Required
- Review the Arista Security Advisory #0123 to determine affected EOS or product versions in your environment
- Apply the vendor-supplied patch or hotfix as soon as it is available for your release train
- Restrict access to device management interfaces to a dedicated management network and trusted administrator workstations
- Rotate credentials for any high-privilege accounts on affected devices
Patch Information
Arista has published remediation details in Security Advisory #0123. Administrators should consult the advisory for the list of fixed releases and apply the appropriate update or hotpatch for their deployed version.
Workarounds
- Limit privileged account access to the smallest set of administrators required for operations
- Enforce role-based access control (RBAC) so that only specific roles can invoke diagnostics commands
- Place management interfaces behind a jump host with multi-factor authentication and session recording
- Enable command authorization through TACACS+ or RADIUS to deny diagnostics commands to non-essential accounts
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
