CVE-2025-2767: arista ng_firewall Cross-site Scripting

Vulnerability summary

CVE-2025-2767 is a critical (CVSS 9.6) Cross-site Scripting vulnerability in arista ng_firewall. EPSS estimates a 0.64% chance of exploitation in the next 30 days, higher than 49.8% of scored vulnerabilities.

Timeline

1. 23-04-2025
   PublishedVulnerability first disclosed.
2. 23-04-2025
   Last modifiedVulnerability information updated.

Description

Arista NG Firewall User-Agent Cross-Site Scripting Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Arista NG Firewall. Minimal user interaction is required to exploit this vulnerability. The specific flaw exists within the processing of the User-Agent HTTP header. The issue results from the lack of proper validation of user-supplied data, which can lead to the injection of an arbitrary script. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-24407.

• CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.