VULNERABILITY INTELLIGENCE

CVE-2021-28511

CVSS score5.8 MEDIUM
EPSS probability0.60%
CISA KEVNot currently listed
Published2022-08-05
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Description

This advisory documents the impact of an internally found vulnerability in Arista EOS for security ACL bypass. The impact of this vulnerability is that the security ACL drop rule might be bypassed if a NAT ACL rule filter with permit action matches the packet flow. This could allow a host with an IP address in a range that matches the range allowed by a NAT ACL and a range denied by a Security ACL to be forwarded incorrectly as it should have been denied by the Security ACL. This can enable an ACL bypass.

Weakness classification

  • psirt@arista.com: CWE-284
  • nvd@nist.gov: NVD-CWE-Other

Primary references