medium
5.9
Advisory Published
Updated

CVE-2020-26569

First published: Mon Dec 28 2020(Updated: )

In EVPN VxLAN setups in Arista EOS, specific malformed packets can lead to incorrect MAC to IP bindings and as a result packets can be incorrectly forwarded across VLAN boundaries. This can result in traffic being discarded on the receiving VLAN. This affects versions: 4.21.12M and below releases in the 4.21.x train; 4.22.7M and below releases in the 4.22.x train; 4.23.5M and below releases in the 4.23.x train; 4.24.2F and below releases in the 4.24.x train.

Credit: cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Arista EOS>=4.21.0f<=4.21.12m
Arista EOS>=4.22.0f<=4.22.7m
Arista EOS>=4.23.0f<=4.23.5m
Arista EOS>=4.24.0f<=4.24.2f
Arista 7010t-48
Arista 7050cx3-32s
Arista 7050cx3m-32s
Arista 7050qx-32s
Arista 7050qx2-32s
Arista 7050sx-128
Arista 7050sx-64
Arista 7050sx-72q
Arista 7050sx2-128
Arista 7050sx2-72q
Arista 7050sx3-48c8
Arista 7050sx3-48yc
Arista 7050sx3-48yc12
Arista 7050sx3-48yc8
Arista 7050sx3-96yc8
Arista 7050tx-48
Arista 7050tx-64
Arista 7050tx-72q
Arista 7050tx2-128
Arista 7050tx3-48c8
Arista 7060cx-32s
Arista 7060cx2-32s
Arista 7060dx4-32
Arista 7060px4-32
Arista 7060sx2-48yc6
Arista 720xp-24y6
Arista 720xp-24zy4
Arista 720xp-48y6
Arista 720xp-48zc2
Arista 720xp-96zc2
Arista 7250qx-64
Arista 7260cx
Arista 7260cx3
Arista 7260cx3-64
Arista 7260qx
Arista 7300x-32q
Arista 7300x-64s
Arista 7300x-64t
Arista 7300x3-32c
Arista 7300x3-48yc4
Arista 7304x3
Arista 7308x3
Arista 7320x-32c
Arista 7324x
Arista 7328x
Arista 7368x4

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Reference Links

Frequently Asked Questions

  • What is CVE-2020-26569?

    CVE-2020-26569 is a vulnerability in EVPN VxLAN setups in Arista EOS where specific malformed packets can lead to incorrect MAC to IP bindings.

  • Which versions of Arista EOS are affected by CVE-2020-26569?

    Arista EOS versions 4.21.12M and below releases in 4.21 series, 4.22.7M and below releases in 4.22 series, 4.23.5M and below releases in 4.23 series, and 4.24.2F and below releases in 4.24 series are affected by CVE-2020-26569.

  • What is the severity of CVE-2020-26569?

    The severity of CVE-2020-26569 is medium with a CVSS score of 5.9.

  • How can CVE-2020-26569 be exploited?

    CVE-2020-26569 can be exploited by sending specific malformed packets in EVPN VxLAN setups in Arista EOS.

  • How can I fix CVE-2020-26569?

    To fix CVE-2020-26569, it is recommended to upgrade to a fixed version of Arista EOS mentioned in the security advisory.

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