How severe is CVE-2018-5255?

CVE-2018-5255 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2018-5255 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-5255?

CVE-2018-5255 affects Arista Eos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-5255?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-5255 published?

CVE-2018-5255 was published on 2018-03-05 and last updated on 2026-06-17.

CVE-2018-5255

CVE-2018-5255 is a medium-severity vulnerability in Arista Eos with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Arista Eos
Published: 2018-03-05
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2018-5255?: CVE-2018-5255 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2018-5255 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-5255?: CVE-2018-5255 affects Arista Eos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-5255?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-5255 published?: CVE-2018-5255 was published on 2018-03-05 and last updated on 2026-06-17.

References

https://www.arista.com/en/support/advisories-notices/security-advisories/4347-security-advisory-32

Affected products (1)

cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*

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