What is CVE-2020-26569?

CVE-2020-26569 is a medium-severity vulnerability in Arista 7010t-48. CVSS score: 5.9/10. Published 2020-12-28.

How severe is CVE-2020-26569?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Arista 7010t-48

CVE-2020-26569

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.

Published 2020-12-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.009 (57.5th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.009 · change: +0.000

Affected products

References

www.arista.com/en/support/advisories-notices/security-advisories/11997-security… (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2020-26569?: CVE-2020-26569 is a medium-severity vulnerability in Arista 7010t-48. CVSS score: 5.9/10. Published 2020-12-28.
How severe is CVE-2020-26569?: Medium severity. CVSS v3 base score is 5.9 out of 10.