CVE-2021-28511

Published on: Not Yet Published

Last Modified on: 08/06/2022 02:35:00 AM UTC

CVE-2021-28511 - advisory for 78

Source: Mitre Source: Nist Print: PDF PDF
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Certain versions of EOS from Arista Networks contain the following vulnerability:

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.

  • CVE-2021-28511 has been assigned by URL Logo [email protected] to track the vulnerability
  • Affected Vendor/Software: URL Logo Arista Networks - EOS version <= 4.24.9
  • Affected Vendor/Software: URL Logo Arista Networks - EOS version <= 4.25.8
  • Affected Vendor/Software: URL Logo Arista Networks - EOS version <= 4.26.5
  • Affected Vendor/Software: URL Logo Arista Networks - EOS version <= 4.27.3
Vulnerability Patch/Work Around
  • Configure a NAT “drop” ACL rule for each security ACL “drop” rule that should be applied to the interface that has NAT configured. This will prevent the packets from being translated at the expense of maintaining the configuration in two places.

CVE References

Description Tags Link
Security Advisory 0078 - Arista www.arista.com
text/html
URL Logo MISC www.arista.com/en/support/advisories-notices/security-advisory/15862-security-advisory-0078

Known Affected Software

Vendor Product Version
Arista Networks EOS<= 4.24.9
Arista Networks EOS<= 4.25.8
Arista Networks EOS<= 4.26.5
Arista Networks EOS<= 4.27.3

Social Mentions

Source Title Posted (UTC)
Twitter Icon @CVEreport CVE-2021-28511 : This advisory documents the impact of an internally found vulnerability in Arista EOS for security… twitter.com/i/web/status/1… 2022-08-05 17:06:24
Twitter Icon @JohnJasonFallow New vulnerability on the NVD: CVE-2021-28511 ift.tt/CM0DKzW 2022-08-05 18:11:46
Twitter Icon @WesUncensored New vulnerability on the NVD: CVE-2021-28511 ift.tt/lRtPFvk 2022-08-05 18:33:33
Twitter Icon @workentin New vulnerability on the NVD: CVE-2021-28511 ift.tt/VnCh4xt 2022-08-05 18:40:45
Twitter Icon @xanadulinux CVE-2021-28511 ift.tt/swSPzKq 2022-08-05 18:52:30
Twitter Icon @WesUncensored New vulnerability on the NVD: CVE-2021-28511 ift.tt/lRtPFvk 2022-08-06 07:33:34
Twitter Icon @Har_sia CVE-2021-28511 har-sia.info/CVE-2021-28511… #HarsiaInfo 2022-08-07 07:00:09
Twitter Icon @4ng3n01r3 #CyberSecurity #Security #CERT #CVE #Nist #breach #vulnerability : CVE-2021-28511 2022-08-08 06:55:13
Reddit Logo Icon /r/netcve CVE-2021-28511 2022-08-05 18:38:47
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