How severe is CVE-2020-15897?

CVE-2020-15897 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-2020-15897 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-15897?

CVE-2020-15897 affects Arista Eos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-15897?

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-2020-15897 published?

CVE-2020-15897 was published on 2020-10-26 and last updated on 2026-06-17.

CVE-2020-15897

CVE-2020-15897 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: 5.0
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Arista Eos
Published: 2020-10-26
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 traffic loss or incorrect forwarding of traffic via a malformed link-state PDU to the IS-IS router.

Frequently asked questions

What is CVE-2020-15897?: 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 traffic loss or incorrect forwarding of traffic via a malformed link-state PDU to the IS-IS router.
How severe is CVE-2020-15897?: CVE-2020-15897 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-2020-15897 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-15897?: CVE-2020-15897 affects Arista Eos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-15897?: 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-2020-15897 published?: CVE-2020-15897 was published on 2020-10-26 and last updated on 2026-06-17.

References

https://www.arista.com/en/support/advisories-notices/security-advisories/11760-security-advisory-54

Affected products (1)

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

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