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MEDIUM · 5.8

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 ...

Vulnerability 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.

CVSS Score

5.8

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE

Affected Products

VendorProductVersions
AristaEos<= 4.24.9
Arista7050Cx3-32S-
Arista7050Cx3M-32S-
Arista7050Sx3-48C8-
Arista7050Sx3-48Yc-
Arista7050Sx3-48Yc12-
Arista7050Sx3-48Yc8-
Arista7050Sx3-96Yc8-
Arista7050Tx3-48C8-
Arista720Xp-24Y6-
Arista720Xp-24Zy4-
Arista720Xp-48Y6-
Arista720Xp-48Zc2-
Arista720Xp-96Zc2-
Arista7300X3-32C-
Arista7300X3-48Yc4-

Related Weaknesses (CWE)

CWE-284

References

FAQ

What is CVE-2021-28511?

CVE-2021-28511 is a vulnerability with a CVSS score of 5.8 (MEDIUM). 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 ...

How severe is CVE-2021-28511?

CVE-2021-28511 has been rated MEDIUM with a CVSS base score of 5.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2021-28511?

Check the references section above for vendor advisories and patch information. Affected products include: Arista Eos, Arista 7050Cx3-32S, Arista 7050Cx3M-32S, Arista 7050Sx3-48C8, Arista 7050Sx3-48Yc.