What is CVE-2025-2767?

CVE-2025-2767 is a critical-severity vulnerability in Arista Ng Firewall, classified under Cross-site Scripting. CVSS score: 9.6/10. Published 2025-04-23.

How severe is CVE-2025-2767?

Critical severity. CVSS v3 base score is 9.6 out of 10.

XSS in Arista Ng Firewall

CVE-2025-2767

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.006 (46.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

Affected products

Arista Ng Firewall — versions 17.1.1
Arista Ng_firewall — versions 17.1.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

zdi-disclosures@trendmicro.com (x_research-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2025-2767?: CVE-2025-2767 is a critical-severity vulnerability in Arista Ng Firewall, classified under Cross-site Scripting. CVSS score: 9.6/10. Published 2025-04-23.
How severe is CVE-2025-2767?: Critical severity. CVSS v3 base score is 9.6 out of 10.