CVE-2026-33904 MEDIUM

CVE-2026-33904: Ella Core has a Denial of Service via SCTP connection cleanup deadlock

Vendor Ellanetworks
Product core
Weakness CWE-833
Published March 27, 2026
Last update March 31, 2026

CVSS base score

6.5/10
Attack vector Adjacent
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 27, 2026 CVE published
March 31, 2026 Record updated