CVE-2026-33904: Ella Core is a 5G core designed for private networks

Q: How do I fix CVE-2026-33904?

ella core: upgrade to 1.7.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-33904 being exploited?

CVE-2026-33904 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33904 affect?

CVE-2026-33904 affects ella core. Severity is medium (CVSS 6.5). 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 in

Q: How urgent is CVE-2026-33904?

Priority 24/100. No elevated risk signals yet.

Routine

MEDIUM 6.5UPGRADE

CVE-2026-33904 is a medium-severity flaw (CVSS 6.5) affecting ella core. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 93%)
CISA exploited list	No
Weakness	CWE-833
Published	2026-03-27
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: ellanetworks

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-27 21:17 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

ellanetworks ella core UPGRADE

Affected: < 1.7.0

Fixed in: 1.7.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ella-core || rpm -q ella-core || ella-core --version

2. UPGRADE to 1.7.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ella-core

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ella-core

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33904?

ella core: upgrade to 1.7.0. Exact commands for each OS are on this page.

Is CVE-2026-33904 being exploited?

CVE-2026-33904 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33904 affect?

CVE-2026-33904 affects ella core. Severity is medium (CVSS 6.5). 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 in

How urgent is CVE-2026-33904?

Priority 24/100. No elevated risk signals yet.

Related CVEs

CVE-2026-33907 MEDIUM 6.5 UPGRADE Ella Core is a 5G core designed for private networks
CVE-2026-33906 HIGH 7.2 UPGRADE Ella Core is a 5G core designed for private networks
CVE-2026-33903 MEDIUM 6.5 UPGRADE Ella Core is a 5G core designed for private networks

References

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