SB2022033054 - IPv4 access list bypass in Arista EOS
Published: March 30, 2022 Updated: May 17, 2025
Security Bulletin ID
SB2022033054
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper access control (CVE-ID: CVE-2021-28505)
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to improper access restrictions. If a VXLAN match rule exists in an IPv4 access-list that is applied to the ingress of an L2 or an L3 port/SVI, the VXLAN rule and subsequent ACL rules in that access list will ignore the specified IP protocol. A remote attacker can bypass implemented security restrictions and gain unauthorized access to the application.
Remediation
Install update from vendor's website.