// For flags

CVE-2021-28511

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 t ...

Severity Score

6.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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.

Este aviso documenta el impacto de una vulnerabilidad encontrada internamente en Arista EOS para omitir las ACL de seguridad. El impacto de esta vulnerabilidad es que la regla de caída de la ACL de seguridad podría omitirse si un filtro de regla ACL de NAT con acción de permiso coincide con el flujo de paquetes. Esto podría permitir que un host con una dirección IP en un rango que coincida con el rango permitido por una ACL de NAT y un rango denegado por una ACL de seguridad sea reenviado incorrectamente ya que debería haber sido denegado por la ACL de seguridad. Esto puede permitir una derivación de la ACL

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-03-16 CVE Reserved
  • 2022-08-05 CVE Published
  • 2024-02-09 EPSS Updated
  • 2024-09-16 CVE Updated
  • 2024-09-16 First Exploit
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-284: Improper Access Control
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
<= 4.24.9
Search vendor "Arista" for product "Eos" and version " <= 4.24.9"
-
Affected
in Arista
Search vendor "Arista"
7050cx3-32s
Search vendor "Arista" for product "7050cx3-32s"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
<= 4.24.9
Search vendor "Arista" for product "Eos" and version " <= 4.24.9"
-
Affected
in Arista
Search vendor "Arista"
7050cx3m-32s
Search vendor "Arista" for product "7050cx3m-32s"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
<= 4.24.9
Search vendor "Arista" for product "Eos" and version " <= 4.24.9"
-
Affected
in Arista
Search vendor "Arista"
7050sx3-48c8
Search vendor "Arista" for product "7050sx3-48c8"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
<= 4.24.9
Search vendor "Arista" for product "Eos" and version " <= 4.24.9"
-
Affected
in Arista
Search vendor "Arista"
7050sx3-48yc
Search vendor "Arista" for product "7050sx3-48yc"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
<= 4.24.9
Search vendor "Arista" for product "Eos" and version " <= 4.24.9"
-
Affected
in Arista
Search vendor "Arista"
7050sx3-48yc12
Search vendor "Arista" for product "7050sx3-48yc12"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
<= 4.24.9
Search vendor "Arista" for product "Eos" and version " <= 4.24.9"
-
Affected
in Arista
Search vendor "Arista"
7050sx3-48yc8
Search vendor "Arista" for product "7050sx3-48yc8"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
<= 4.24.9
Search vendor "Arista" for product "Eos" and version " <= 4.24.9"
-
Affected
in Arista
Search vendor "Arista"
7050sx3-96yc8
Search vendor "Arista" for product "7050sx3-96yc8"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
<= 4.24.9
Search vendor "Arista" for product "Eos" and version " <= 4.24.9"
-
Affected
in Arista
Search vendor "Arista"
7050tx3-48c8
Search vendor "Arista" for product "7050tx3-48c8"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
<= 4.24.9
Search vendor "Arista" for product "Eos" and version " <= 4.24.9"
-
Affected
in Arista
Search vendor "Arista"
720xp-24y6
Search vendor "Arista" for product "720xp-24y6"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
<= 4.24.9
Search vendor "Arista" for product "Eos" and version " <= 4.24.9"
-
Affected
in Arista
Search vendor "Arista"
720xp-24zy4
Search vendor "Arista" for product "720xp-24zy4"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
<= 4.24.9
Search vendor "Arista" for product "Eos" and version " <= 4.24.9"
-
Affected
in Arista
Search vendor "Arista"
720xp-48y6
Search vendor "Arista" for product "720xp-48y6"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
<= 4.24.9
Search vendor "Arista" for product "Eos" and version " <= 4.24.9"
-
Affected
in Arista
Search vendor "Arista"
720xp-48zc2
Search vendor "Arista" for product "720xp-48zc2"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
<= 4.24.9
Search vendor "Arista" for product "Eos" and version " <= 4.24.9"
-
Affected
in Arista
Search vendor "Arista"
720xp-96zc2
Search vendor "Arista" for product "720xp-96zc2"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
<= 4.24.9
Search vendor "Arista" for product "Eos" and version " <= 4.24.9"
-
Affected
in Arista
Search vendor "Arista"
7300x3-32c
Search vendor "Arista" for product "7300x3-32c"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
<= 4.24.9
Search vendor "Arista" for product "Eos" and version " <= 4.24.9"
-
Affected
in Arista
Search vendor "Arista"
7300x3-48yc4
Search vendor "Arista" for product "7300x3-48yc4"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.25.0 <= 4.25.8
Search vendor "Arista" for product "Eos" and version " >= 4.25.0 <= 4.25.8"
-
Affected
in Arista
Search vendor "Arista"
7050cx3-32s
Search vendor "Arista" for product "7050cx3-32s"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.25.0 <= 4.25.8
Search vendor "Arista" for product "Eos" and version " >= 4.25.0 <= 4.25.8"
-
Affected
in Arista
Search vendor "Arista"
7050cx3m-32s
Search vendor "Arista" for product "7050cx3m-32s"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.25.0 <= 4.25.8
Search vendor "Arista" for product "Eos" and version " >= 4.25.0 <= 4.25.8"
-
Affected
in Arista
Search vendor "Arista"
7050sx3-48c8
Search vendor "Arista" for product "7050sx3-48c8"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.25.0 <= 4.25.8
Search vendor "Arista" for product "Eos" and version " >= 4.25.0 <= 4.25.8"
-
Affected
in Arista
Search vendor "Arista"
7050sx3-48yc
Search vendor "Arista" for product "7050sx3-48yc"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.25.0 <= 4.25.8
Search vendor "Arista" for product "Eos" and version " >= 4.25.0 <= 4.25.8"
-
Affected
in Arista
Search vendor "Arista"
7050sx3-48yc12
Search vendor "Arista" for product "7050sx3-48yc12"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.25.0 <= 4.25.8
Search vendor "Arista" for product "Eos" and version " >= 4.25.0 <= 4.25.8"
-
Affected
in Arista
Search vendor "Arista"
7050sx3-48yc8
Search vendor "Arista" for product "7050sx3-48yc8"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.25.0 <= 4.25.8
Search vendor "Arista" for product "Eos" and version " >= 4.25.0 <= 4.25.8"
-
Affected
in Arista
Search vendor "Arista"
7050sx3-96yc8
Search vendor "Arista" for product "7050sx3-96yc8"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.25.0 <= 4.25.8
Search vendor "Arista" for product "Eos" and version " >= 4.25.0 <= 4.25.8"
-
Affected
in Arista
Search vendor "Arista"
7050tx3-48c8
Search vendor "Arista" for product "7050tx3-48c8"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.25.0 <= 4.25.8
Search vendor "Arista" for product "Eos" and version " >= 4.25.0 <= 4.25.8"
-
Affected
in Arista
Search vendor "Arista"
720xp-24y6
Search vendor "Arista" for product "720xp-24y6"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.25.0 <= 4.25.8
Search vendor "Arista" for product "Eos" and version " >= 4.25.0 <= 4.25.8"
-
Affected
in Arista
Search vendor "Arista"
720xp-24zy4
Search vendor "Arista" for product "720xp-24zy4"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.25.0 <= 4.25.8
Search vendor "Arista" for product "Eos" and version " >= 4.25.0 <= 4.25.8"
-
Affected
in Arista
Search vendor "Arista"
720xp-48y6
Search vendor "Arista" for product "720xp-48y6"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.25.0 <= 4.25.8
Search vendor "Arista" for product "Eos" and version " >= 4.25.0 <= 4.25.8"
-
Affected
in Arista
Search vendor "Arista"
720xp-48zc2
Search vendor "Arista" for product "720xp-48zc2"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.25.0 <= 4.25.8
Search vendor "Arista" for product "Eos" and version " >= 4.25.0 <= 4.25.8"
-
Affected
in Arista
Search vendor "Arista"
720xp-96zc2
Search vendor "Arista" for product "720xp-96zc2"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.25.0 <= 4.25.8
Search vendor "Arista" for product "Eos" and version " >= 4.25.0 <= 4.25.8"
-
Affected
in Arista
Search vendor "Arista"
7300x3-32c
Search vendor "Arista" for product "7300x3-32c"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.25.0 <= 4.25.8
Search vendor "Arista" for product "Eos" and version " >= 4.25.0 <= 4.25.8"
-
Affected
in Arista
Search vendor "Arista"
7300x3-48yc4
Search vendor "Arista" for product "7300x3-48yc4"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.26.0 <= 4.26.5
Search vendor "Arista" for product "Eos" and version " >= 4.26.0 <= 4.26.5"
-
Affected
in Arista
Search vendor "Arista"
7050cx3-32s
Search vendor "Arista" for product "7050cx3-32s"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.26.0 <= 4.26.5
Search vendor "Arista" for product "Eos" and version " >= 4.26.0 <= 4.26.5"
-
Affected
in Arista
Search vendor "Arista"
7050cx3m-32s
Search vendor "Arista" for product "7050cx3m-32s"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.26.0 <= 4.26.5
Search vendor "Arista" for product "Eos" and version " >= 4.26.0 <= 4.26.5"
-
Affected
in Arista
Search vendor "Arista"
7050sx3-48c8
Search vendor "Arista" for product "7050sx3-48c8"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.26.0 <= 4.26.5
Search vendor "Arista" for product "Eos" and version " >= 4.26.0 <= 4.26.5"
-
Affected
in Arista
Search vendor "Arista"
7050sx3-48yc
Search vendor "Arista" for product "7050sx3-48yc"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.26.0 <= 4.26.5
Search vendor "Arista" for product "Eos" and version " >= 4.26.0 <= 4.26.5"
-
Affected
in Arista
Search vendor "Arista"
7050sx3-48yc12
Search vendor "Arista" for product "7050sx3-48yc12"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.26.0 <= 4.26.5
Search vendor "Arista" for product "Eos" and version " >= 4.26.0 <= 4.26.5"
-
Affected
in Arista
Search vendor "Arista"
7050sx3-48yc8
Search vendor "Arista" for product "7050sx3-48yc8"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.26.0 <= 4.26.5
Search vendor "Arista" for product "Eos" and version " >= 4.26.0 <= 4.26.5"
-
Affected
in Arista
Search vendor "Arista"
7050sx3-96yc8
Search vendor "Arista" for product "7050sx3-96yc8"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.26.0 <= 4.26.5
Search vendor "Arista" for product "Eos" and version " >= 4.26.0 <= 4.26.5"
-
Affected
in Arista
Search vendor "Arista"
7050tx3-48c8
Search vendor "Arista" for product "7050tx3-48c8"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.26.0 <= 4.26.5
Search vendor "Arista" for product "Eos" and version " >= 4.26.0 <= 4.26.5"
-
Affected
in Arista
Search vendor "Arista"
720xp-24y6
Search vendor "Arista" for product "720xp-24y6"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.26.0 <= 4.26.5
Search vendor "Arista" for product "Eos" and version " >= 4.26.0 <= 4.26.5"
-
Affected
in Arista
Search vendor "Arista"
720xp-24zy4
Search vendor "Arista" for product "720xp-24zy4"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.26.0 <= 4.26.5
Search vendor "Arista" for product "Eos" and version " >= 4.26.0 <= 4.26.5"
-
Affected
in Arista
Search vendor "Arista"
720xp-48y6
Search vendor "Arista" for product "720xp-48y6"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.26.0 <= 4.26.5
Search vendor "Arista" for product "Eos" and version " >= 4.26.0 <= 4.26.5"
-
Affected
in Arista
Search vendor "Arista"
720xp-48zc2
Search vendor "Arista" for product "720xp-48zc2"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.26.0 <= 4.26.5
Search vendor "Arista" for product "Eos" and version " >= 4.26.0 <= 4.26.5"
-
Affected
in Arista
Search vendor "Arista"
720xp-96zc2
Search vendor "Arista" for product "720xp-96zc2"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.26.0 <= 4.26.5
Search vendor "Arista" for product "Eos" and version " >= 4.26.0 <= 4.26.5"
-
Affected
in Arista
Search vendor "Arista"
7300x3-32c
Search vendor "Arista" for product "7300x3-32c"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.26.0 <= 4.26.5
Search vendor "Arista" for product "Eos" and version " >= 4.26.0 <= 4.26.5"
-
Affected
in Arista
Search vendor "Arista"
7300x3-48yc4
Search vendor "Arista" for product "7300x3-48yc4"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.27.0 <= 4.27.3
Search vendor "Arista" for product "Eos" and version " >= 4.27.0 <= 4.27.3"
-
Affected
in Arista
Search vendor "Arista"
7050cx3-32s
Search vendor "Arista" for product "7050cx3-32s"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.27.0 <= 4.27.3
Search vendor "Arista" for product "Eos" and version " >= 4.27.0 <= 4.27.3"
-
Affected
in Arista
Search vendor "Arista"
7050cx3m-32s
Search vendor "Arista" for product "7050cx3m-32s"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.27.0 <= 4.27.3
Search vendor "Arista" for product "Eos" and version " >= 4.27.0 <= 4.27.3"
-
Affected
in Arista
Search vendor "Arista"
7050sx3-48c8
Search vendor "Arista" for product "7050sx3-48c8"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.27.0 <= 4.27.3
Search vendor "Arista" for product "Eos" and version " >= 4.27.0 <= 4.27.3"
-
Affected
in Arista
Search vendor "Arista"
7050sx3-48yc
Search vendor "Arista" for product "7050sx3-48yc"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.27.0 <= 4.27.3
Search vendor "Arista" for product "Eos" and version " >= 4.27.0 <= 4.27.3"
-
Affected
in Arista
Search vendor "Arista"
7050sx3-48yc12
Search vendor "Arista" for product "7050sx3-48yc12"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.27.0 <= 4.27.3
Search vendor "Arista" for product "Eos" and version " >= 4.27.0 <= 4.27.3"
-
Affected
in Arista
Search vendor "Arista"
7050sx3-48yc8
Search vendor "Arista" for product "7050sx3-48yc8"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.27.0 <= 4.27.3
Search vendor "Arista" for product "Eos" and version " >= 4.27.0 <= 4.27.3"
-
Affected
in Arista
Search vendor "Arista"
7050sx3-96yc8
Search vendor "Arista" for product "7050sx3-96yc8"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.27.0 <= 4.27.3
Search vendor "Arista" for product "Eos" and version " >= 4.27.0 <= 4.27.3"
-
Affected
in Arista
Search vendor "Arista"
7050tx3-48c8
Search vendor "Arista" for product "7050tx3-48c8"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.27.0 <= 4.27.3
Search vendor "Arista" for product "Eos" and version " >= 4.27.0 <= 4.27.3"
-
Affected
in Arista
Search vendor "Arista"
720xp-24y6
Search vendor "Arista" for product "720xp-24y6"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.27.0 <= 4.27.3
Search vendor "Arista" for product "Eos" and version " >= 4.27.0 <= 4.27.3"
-
Affected
in Arista
Search vendor "Arista"
720xp-24zy4
Search vendor "Arista" for product "720xp-24zy4"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.27.0 <= 4.27.3
Search vendor "Arista" for product "Eos" and version " >= 4.27.0 <= 4.27.3"
-
Affected
in Arista
Search vendor "Arista"
720xp-48y6
Search vendor "Arista" for product "720xp-48y6"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.27.0 <= 4.27.3
Search vendor "Arista" for product "Eos" and version " >= 4.27.0 <= 4.27.3"
-
Affected
in Arista
Search vendor "Arista"
720xp-48zc2
Search vendor "Arista" for product "720xp-48zc2"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.27.0 <= 4.27.3
Search vendor "Arista" for product "Eos" and version " >= 4.27.0 <= 4.27.3"
-
Affected
in Arista
Search vendor "Arista"
720xp-96zc2
Search vendor "Arista" for product "720xp-96zc2"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.27.0 <= 4.27.3
Search vendor "Arista" for product "Eos" and version " >= 4.27.0 <= 4.27.3"
-
Affected
in Arista
Search vendor "Arista"
7300x3-32c
Search vendor "Arista" for product "7300x3-32c"
--
Safe
Arista
Search vendor "Arista"
Eos
Search vendor "Arista" for product "Eos"
>= 4.27.0 <= 4.27.3
Search vendor "Arista" for product "Eos" and version " >= 4.27.0 <= 4.27.3"
-
Affected
in Arista
Search vendor "Arista"
7300x3-48yc4
Search vendor "Arista" for product "7300x3-48yc4"
--
Safe