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CVE-2026-44474

Ella Core: Handover failures during concurrent Security Mode Command

Published: May 27, 2026Updated: May 27, 2026 Sources: CVE List NVD
NVD MITRE
3.7CVSS
LOW

Ella Core is a 5G core designed for private networks. Prior to 1.10.0, Ella Core didn't enforce security rules on concurrent running of security procedures defined in TS 33.501 §6.9.5.1 — it could send a NAS Security Mode Command while an N2 handover was still pending (and vice versa). Concurrent Security Mode Command and N2 handover produce a KgNB mismatch between the UE and target gNB, causing the handover to fail. Requires a stalled gNB + re-registration race to trigger. This vulnerability is fixed in 1.10.0.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:AAC:HPR:LUI:NS:UC:NI:LA:L
Exploitability
AV:AAttack Vector
Adjacent
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:LAvailability
Low

Weaknesses

CWE-358

Affected Products

core
ellanetworks

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://github.com/ellanetworks/core/security/advisories/GHSA-mc29-hmx6-856q
github.com

Timeline

Published
May 27, 2026
Last Updated
May 27, 2026

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