What is CVE-2026-33907?

CVE-2026-33907 is a medium-severity vulnerability in Ellanetworks Core, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2026-03-27.

How severe is CVE-2026-33907?

Medium severity. CVSS v3 base score is 6.5 out of 10.

NULL pointer dereference in Ellanetworks Core

CVE-2026-33907

Ella Core is a 5G core designed for private networks. Versions prior to 1.7.0 panic when processing Authentication Response and Authentication Failure NAS message missing IEs. 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 1.7.0 added IE presence verification to NAS message handling.

Published 2026-03-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (31.5th percentile), scored 2026-10-23.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002

Affected products

Ellanetworks Core — versions < 1.7.0
Ellanetworks Ella Core

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

github.com/ellanetworks/core/security/advisories/GHSA-55q8-2gwx-29pc (Vendor Advisory)
github.com/ellanetworks/core/commit/52962660e3bd3e23c7e96b0da270ac1e0e705273 (Patch)
github.com/ellanetworks/core/releases/tag/v1.7.0 (Release Notes)

Frequently asked questions

What is CVE-2026-33907?: CVE-2026-33907 is a medium-severity vulnerability in Ellanetworks Core, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2026-03-27.
How severe is CVE-2026-33907?: Medium severity. CVSS v3 base score is 6.5 out of 10.