Is CVE-2023-40457 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2023-40457?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2023-40457 have an EU (EUVD) identifier?

Yes. CVE-2023-40457 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-45028.

When was CVE-2023-40457 published?

CVE-2023-40457 was published on 2024-11-11 and last updated on 2026-06-17.

CVE-2023-40457

CVE-2023-40457 is a security vulnerability that is still awaiting full analysis and scoring. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-209.

Key facts

EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-45028
Weakness: CWE-209
Published: 2024-11-11
Last modified: 2026-06-17

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."

Frequently asked questions

What is 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 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."
Is CVE-2023-40457 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2023-40457?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2023-40457 have an EU (EUVD) identifier?: Yes. CVE-2023-40457 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-45028.
When was CVE-2023-40457 published?: CVE-2023-40457 was published on 2024-11-11 and last updated on 2026-06-17.

References

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