CVE-2026-33283: Ella Core panics on malformed ULNASTransport Message without a Request Type

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-24 · updated 2026-06-17
Weakness: CWE-476

Description

Ella Core is a 5G core designed for private networks. Versions prior to 1.6.0 panic when processing malformed UL NAS Transport NAS messages without a Request Type. An attacker able to send crafted NAS messages to Ella Core can crash the process, causing service disruption for all connected subscribers. No authentication is required. Version 1.6.0 adds a guard when receiving an UL NAS Message without a Request Type given no SM Context.

Affected products

ellanetworks core: before 1.6.0 — fixed in 1.6.0

How to fix

Upgrade to a fixed version: ellanetworks core 1.6.0. Check the vendor advisory for mitigations.

References

https://github.com/ellanetworks/core/security/advisories/GHSA-3366-gw57-fcm5

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