CVEvulnerability

CVE-2021-28511

6.5 MEDIUM Published 2022-08-05 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2022-08-05
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
5.8 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
CVSS 3.1 ([email protected])
6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weaknesses
CWE-284

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.

Affected configurations

• arista eos (<= 4.24.9) • arista eos (>= 4.25.0 <= 4.25.8) • arista eos (>= 4.26.0 <= 4.26.5) • arista eos (>= 4.27.0 <= 4.27.3)

Related

Weakness · CWE (1)

  • CWE-284 Improper Access Control weakness

References