Advisory Details

November 25th, 2025

Arista NG Firewall replace_marker Exposed Dangerous Function Authentication Bypass Vulnerability

CVE ID	CVE-2025-6979
CVSS SCORE	8.8, AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AFFECTED VENDORS	Arista
AFFECTED PRODUCTS	NG Firewall
VULNERABILITY DETAILS	This vulnerability allows remote attackers to to bypass authentication on affected installations of Arista NG Firewall. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the handler.py module. The issue results from an exposed dangerous method. An attacker can leverage this vulnerability to bypass authentication on the system.
ADDITIONAL DETAILS	Arista has issued an update to correct this vulnerability. More details can be found at: https://www.arista.com/en/support/advisories-notices/security-advisory/22535-security-advisory-0123
DISCLOSURE TIMELINE	2025-06-18 - Vulnerability reported to vendor 2025-11-25 - Coordinated public release of advisory 2025-11-25 - Advisory Updated
CREDIT	Gereon Huppertz

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