CVE-2023-40457
highpriority · track · 0EPSS 0.003 · 22 %ileDEEUEPSS · scored 2026-10-27
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."
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (3)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2024-3394Extreme Networks ExtremeXOS: Schwachstelle ermöglicht Denial of ServiceDeutsch2024-11-10csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Extreme Networks ExtremeXOS ausnutzen, um einen Denial of Service Angriff durchzuführen.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (10)
External citations — patches, advisories, analysis.
- https://blog.benjojo.co.uk/asset/JgH8G5duO1cnnvd
- https://blog.benjojo.co.uk/post/bgp-path-attributes-grave-error-handlingcnnvd
- https://supportdocs.extremenetworks.com/support/documentation/extremexos-32-5/cnnvd
- https://vigilance.fr/vulnerability/Extreme-Networks-EXOS-denial-of-service-via-BGP-Update-Messages-42925cnnvd
- https://blog.benjojo.co.uk/asset/JgH8G5duO1enisa_euvd
- https://blog.benjojo.co.uk/post/bgp-path-attributes-grave-error-handlingenisa_euvd
- https://supportdocs.extremenetworks.com/support/documentation/extremexos-32-5/enisa_euvd
- https://blog.benjojo.co.uk/asset/JgH8G5duO1nvd
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