UDP Vulnerability in Arista EOS Network Operating System
CVE-2025-6188

7.5HIGH

Key Information:

Vendor

Arista Networks

Status
Eos
Vendor
CVE Published:
25 August 2025

What is CVE-2025-6188?

A vulnerability exists in Arista's EOS operating system, where specifically malformed UDP packets originating from port 3503 can be processed by the system. This can lead to unpredictable behavior in UDP-based services lacking adequate authentication mechanisms. The flaw arises due to the acceptance of unexpected packet types, potentially allowing attackers to exploit the services reliant on EOS for network operations. Organizations using affected versions should implement patches and configure their systems to mitigate risks associated with unauthorized packet processing.

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Affected Version(s)

EOS EOS 4.33.0 <= 4.33.1F

EOS EOS 4.33.1.0 <= 4.33.1.2F

EOS EOS 4.32.4.0 <= 4.32.4.1M

References

https://www.arista.com/en/support/advisories-notices/secu...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

This issue was discovered externally and responsibly reported to Arista by Chris Laffin of automattic.com.
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