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

Quick assessment

Affected
ellanetworks core
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ella Core是Ella Networks开源的一个用于私有网络的5G核心网解决方案。 Ella Core 1.7.0之前版本存在安全漏洞，该漏洞源于AMF的SCTP通知处理程序存在死锁，可能导致攻击者使Ella Core挂起，造成所有用户的拒绝服务。

CVSS 6.5 · Medium EPSS 0.26% · P16
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I. Basic Information for CVE-2026-33904

Vulnerability Information
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Vulnerability Title
Ella Core has a Denial of Service via SCTP connection cleanup deadlock
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
死锁
Source: CVE Program / CVE List V5
Vulnerability Title
Ella Core 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ella Core是Ella Networks开源的一个用于私有网络的5G核心网解决方案。 Ella Core 1.7.0之前版本存在安全漏洞，该漏洞源于AMF的SCTP通知处理程序存在死锁，可能导致攻击者使Ella Core挂起，造成所有用户的拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ellanetworks core < 1.7.0 -

II. Public POCs for CVE-2026-33904

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III. Intelligence Information for CVE-2026-33904

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Patches & Fixes for CVE-2026-33904 (1)

Vendor Advisories for CVE-2026-33904 (1)

Vendor Pages for CVE-2026-33904 (1)

Same Patch Batch · ellanetworks · 2026-03-27 · 4 CVEs total

CVE-2026-33906 7.2 HIGH Ella Core has Privilege Escalation via Database Restore by NetworkManager role
CVE-2026-33907 6.5 MEDIUM Ella Core Panics during NAS Authentication Response/Failure with missing IEs
CVE-2026-33903 6.5 MEDIUM Ella Core panics when processing a crafted NGAP LocationReport message

IV. Related Vulnerabilities

Same product: core
Same vendor: ellanetworks
Same weakness: CWE-833

V. Comments for CVE-2026-33904

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