How severe is CVE-2020-17355?

CVE-2020-17355 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-17355 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-17355?

CVE-2020-17355 affects Arista Eos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-17355?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-17355 published?

CVE-2020-17355 was published on 2020-10-21 and last updated on 2026-06-17.

CVE-2020-17355

CVE-2020-17355 is a high-severity vulnerability in Arista Eos with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 4.3
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Arista Eos
Published: 2020-10-21
Last modified: 2026-06-17

Description

Arista EOS before 4.21.12M, 4.22.x before 4.22.7M, 4.23.x before 4.23.5M, and 4.24.x before 4.24.2F allows remote attackers to cause a denial of service (restart of agents) by crafting a malformed DHCP packet which leads to an incorrect route being installed.

Frequently asked questions

What is CVE-2020-17355?: Arista EOS before 4.21.12M, 4.22.x before 4.22.7M, 4.23.x before 4.23.5M, and 4.24.x before 4.24.2F allows remote attackers to cause a denial of service (restart of agents) by crafting a malformed DHCP packet which leads to an incorrect route being installed.
How severe is CVE-2020-17355?: CVE-2020-17355 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-17355 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-17355?: CVE-2020-17355 affects Arista Eos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-17355?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-17355 published?: CVE-2020-17355 was published on 2020-10-21 and last updated on 2026-06-17.

References

https://www.arista.com/en/support/advisories-notices/security-advisories/11759-security-advisory-53

Affected products (1)

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

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