VulnerabilityAnalyzed

CVE-2026-33283

An attacker able to send crafted NAS messages to Ella Core can crash the process, causing service disruption for all connected subscribers.

HIGH 7.5EPSS 0.36%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.36%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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.

CVSS 3.1: 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.36% probability · 30th percentile
CISA KEV: Not listed
Weakness: CWE-476
Affected: ellanetworks/ella core
Source: security-advisories@github.com

References

https://github.com/ellanetworks/core/security/advisories/GHSA-3366-gw57-fcm5Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.