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 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.

CVSS v3.0 6.5 MEDIUM

6.5^/10

CVSS v3.0 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://www.arista.com/en/support/advisories-notices/security-advisory/15862-security-advisory-0078	Exploit Mitigation Vendor Advisory

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Configurations

Configuration 1 (hide)

AND

OR	cpe:2.3:o:arista:eos::::::::
	cpe:2.3:o:arista:eos::::::::
	cpe:2.3:o:arista:eos::::::::
	cpe:2.3:o:arista:eos::::::::

OR	cpe:2.3:h:arista:7300x3-32c:-:::::::*
	cpe:2.3:h:arista:7300x3-48yc4:-:::::::*
	cpe:2.3:h:arista:720xp-96zc2:-:::::::*
	cpe:2.3:h:arista:720xp-48zc2:-:::::::*
	cpe:2.3:h:arista:720xp-24zy4:-:::::::*
	cpe:2.3:h:arista:720xp-48y6:-:::::::*
	cpe:2.3:h:arista:720xp-24y6:-:::::::*
	cpe:2.3:h:arista:7050cx3-32s:-:::::::*
	cpe:2.3:h:arista:7050cx3m-32s:-:::::::*
	cpe:2.3:h:arista:7050sx3-48c8:-:::::::*
	cpe:2.3:h:arista:7050sx3-48yc:-:::::::*
	cpe:2.3:h:arista:7050sx3-48yc12:-:::::::*
	cpe:2.3:h:arista:7050sx3-96yc8:-:::::::*
	cpe:2.3:h:arista:7050sx3-48yc8:-:::::::*
	cpe:2.3:h:arista:7050tx3-48c8:-:::::::*

Information

Published : 2022-08-05 10:15

Updated : 2022-08-15 13:50

NVD link : CVE-2021-28511

Mitre link : CVE-2021-28511

JSON object : View

CWE

NVD-CWE-Other

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Products Affected

arista

7050cx3m-32s
720xp-24y6
7050cx3-32s
7050sx3-48c8
7050sx3-96yc8
7050sx3-48yc8
7050tx3-48c8
eos
720xp-48y6
7300x3-48yc4
720xp-48zc2
7050sx3-48yc12
7300x3-32c
7050sx3-48yc
720xp-96zc2
720xp-24zy4

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