Vulnerabilities > CVE-2021-28511 - Unspecified vulnerability in Arista EOS

CVSS 6.5 - MEDIUM

Attack vector

NETWORK

Attack complexity

LOW

Privileges required

NONE

Confidentiality impact

LOW

Integrity impact

LOW

Availability impact

NONE

network

low complexity

arista

NVD

Published: 2022-08-05

Updated: 2022-08-15

Summary

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.

Vulnerable Configurations

Part	Description	Count
OS	Arista Arista EOS - Arista EOS 4.9.0 Arista EOS 4.9.12 Arista EOS 4.10.0 Arista EOS 4.10.9 Arista EOS 4.11.0 Arista EOS 4.11.11 Arista EOS 4.12 Arista EOS 4.12.0 Arista EOS 4.12.9 Arista EOS 4.13 Arista EOS 4.13.0 Arista EOS 4.13.9 Arista EOS 4.14 Arista EOS 4.14.0 Arista EOS 4.15 Arista EOS 4.15.3F Arista EOS 4.16 Arista EOS 4.16.6M Arista EOS 4.16.7M Arista EOS 4.16.8M Arista EOS 4.16.9M Arista EOS 4.16.10M Arista EOS 4.16.11M Arista EOS 4.16.12M Arista EOS 4.16.13M Arista EOS 4.17 Arista EOS 4.17.0 Arista EOS 4.17.0F Arista EOS 4.17.1.1F Arista EOS 4.17.1.4F Arista EOS 4.17.1F Arista EOS 4.17.2.1F Arista EOS 4.17.2F Arista EOS 4.17.3F Arista EOS 4.17.4M Arista EOS 4.17.5.1M Arista EOS 4.17.5M Arista EOS 4.17.6M Arista EOS 4.17.7M Arista EOS 4.17.8M Arista EOS 4.18 Arista EOS 4.18.0F Arista EOS 4.18.1.1F Arista EOS 4.18.1F Arista EOS 4.18.2.1F Arista EOS 4.18.2F Arista EOS 4.18.3.1F Arista EOS 4.18.3F Arista EOS 4.18.4.1F Arista EOS 4.18.4.2F Arista EOS 4.18.4F Arista EOS 4.19 Arista EOS 4.19.4M Arista EOS 4.20 Arista EOS 4.20.1 Arista EOS 4.20.1F Arista EOS 4.20.2F Arista EOS 4.20.4.1 Arista EOS 4.20.5 Arista EOS 4.20.5F Arista EOS 4.20.15 Arista EOS 4.21 Arista EOS 4.21.0 Arista EOS 4.21.0F Arista EOS 4.21.1F Arista EOS 4.21.2.4 Arista EOS 4.21.3 Arista EOS 4.21.3F Arista EOS 4.21.4.1F Arista EOS 4.21.8 Arista EOS 4.21.8M Arista EOS 4.21.9M Arista EOS 4.21.11M Arista EOS 4.21.12M Arista EOS 4.21.13M Arista EOS 4.21.14M Arista EOS 4.22 Arista EOS 4.22.0F Arista EOS 4.22.1F Arista EOS 4.22.3M Arista EOS 4.22.4M Arista EOS 4.22.6M Arista EOS 4.22.7M Arista EOS 4.22.8.1F Arista EOS 4.22.9M Arista EOS 4.23 Arista EOS 4.23.0F Arista EOS 4.23.1F Arista EOS 4.23.2F Arista EOS 4.23.3M Arista EOS 4.23.4M Arista EOS 4.23.5M Arista EOS 4.23.6M Arista EOS 4.23.7M Arista EOS 4.23.9 Arista EOS 4.23.9M Arista EOS 4.23.10 Arista EOS 4.23.13M Arista EOS 4.24 Arista EOS 4.24.0 Arista EOS 4.24.0F Arista EOS 4.24.2.1F Arista EOS 4.24.2.4F Arista EOS 4.24.2F Arista EOS 4.24.3.1M Arista EOS 4.24.5M Arista EOS 4.24.7 Arista EOS 4.24.7M Arista EOS 4.24.8 Arista EOS 4.24.9 Arista EOS 4.25.0 Arista EOS 4.25.0F Arista EOS 4.25.1F Arista EOS 4.25.2F Arista EOS 4.25.4 Arista EOS 4.25.5 Arista EOS 4.25.5.1M Arista EOS 4.25.6 Arista EOS 4.25.8 Arista EOS 4.26.0 Arista EOS 4.26.1 Arista EOS 4.26.1F Arista EOS 4.26.2 Arista EOS 4.26.2F Arista EOS 4.26.3M Arista EOS 4.26.4 Arista EOS 4.26.4M Arista EOS 4.26.5 Arista EOS 4.27.0 Arista EOS 4.27.0F Arista EOS 4.27.1 Arista EOS 4.27.1F Arista EOS 4.27.3	134
Hardware	Arista Arista 7050Cx3 32S - Arista 7050Cx3M 32S - Arista 7050Sx3 48C8 - Arista 7050Sx3 48Yc - Arista 7050Sx3 48Yc12 - Arista 7050Sx3 48Yc8 - Arista 7050Sx3 96Yc8 - Arista 7050Tx3 48C8 - Arista 720Xp 24Y6 - Arista 720Xp 24Zy4 - Arista 720Xp 48Y6 - Arista 720Xp 48Zc2 - Arista 720Xp 96Zc2 - Arista 7300X3 32C - Arista 7300X3 48Yc4 -	15

References

https://www.arista.com/en/support/advisories-notices/security-advisory/15862-security-advisory-0078