CVE-2026-33904

CVE-2026-33904 is a medium-severity vulnerability in Ellanetworks Ella Core with a CVSS 3.x base score of 6.5. 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-833.

Key facts

Description

Ella Core is a 5G core designed for private networks. Prior to version 1.7.0, a deadlock in the AMF's SCTP notification handler causes the entire AMF control plane to hang until the process is restarted. An attacker with access to the N2 interface can cause Ella Core to hang, resulting in a denial of service for all subscribers. Version 1.7.0 adds deferred Radio cleanup in serveConn SCTP server so that every connection exit path removes the radio. Remove the stale-entry scan from SCTP Notification handling.

Frequently asked questions

What is CVE-2026-33904?
Ella Core is a 5G core designed for private networks. Prior to version 1.7.0, a deadlock in the AMF's SCTP notification handler causes the entire AMF control plane to hang until the process is restarted. An attacker with access to the N2 interface can cause Ella Core to hang, resulting in a denial of service for all subscribers. Version 1.7.0 adds deferred Radio cleanup in serveConn SCTP server so that every connection exit path removes the radio. Remove the stale-entry scan from SCTP Notification handling.
How severe is CVE-2026-33904?
CVE-2026-33904 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-33904 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33904?
CVE-2026-33904 affects Ellanetworks Ella Core. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33904?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-33904 have an EU (EUVD) identifier?
Yes. CVE-2026-33904 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16841.
When was CVE-2026-33904 published?
CVE-2026-33904 was published on 2026-03-27 and last updated on 2026-06-17.

References

Affected products (1)

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