What is CVE-2018-5255?

CVE-2018-5255 is a medium-severity vulnerability in Arista Eos. CVSS score: 6.5/10. Published 2018-03-05.

How severe is CVE-2018-5255?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Arista Eos

CVE-2018-5255

The Mlag agent in Arista EOS 4.19 before 4.19.4M and 4.20 before 4.20.2F allows remote attackers to cause a denial of service (agent restart) via crafted UDP packets.

Published 2018-03-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.010 (62.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 62.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Arista Eos

References

www.arista.com/en/support/advisories-notices/security-advisories/4347-security-… (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2018-5255?: CVE-2018-5255 is a medium-severity vulnerability in Arista Eos. CVSS score: 6.5/10. Published 2018-03-05.
How severe is CVE-2018-5255?: Medium severity. CVSS v3 base score is 6.5 out of 10.