Description
A vulnerability was found in Open5GS up to 2.7.6. This impacts the function ran_ue_find_by_amf_ue_ngap_id of the file src/amf/context.c of the component AMF/MME. Performing a manipulation results in improper authorization. It is possible to initiate the attack remotely. The exploit has been made public and could be used. The patch is named 5746b8576cfceec18ed87eb7d8cf11b1fb4cd8b1. It is suggested to install a patch to address this issue.
Published: 2026-05-17
Score: 5.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

A flaw in the AMF/MME module of Open5GS allows manipulation of the function ran_ue_find_by_amf_ue_ngap_id, resulting in a failure to enforce proper authorization checks. The vulnerability is not limited to local use; attackers can trigger the exploit remotely through the exposed interface.

Affected Systems

All Open5GS releases up to and including 2.7.6 are affected. Versions newer than 2.7.6 contain the fix. The issue is tied to the file src/amf/context.c within the AMF/MME component.

Risk and Exploitability

The CVSS score of 5.3 classifies the weakness as moderate severity. EPSS information is not provided and the vulnerability is not listed in the CISA KEV catalog. The exploit is publicly available, so a remote attacker may attempt to misuse the improper authorization to violate confidentiality or integrity safeguards.

Generated by OpenCVE AI on May 17, 2026 at 11:21 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply the patch that incorporates commit 5746b8576cfceec18ed87eb7d8cf11b1fb4cd8b1 or upgrade to any Open5GS release newer than 2.7.6.
  • If remediation is delayed, limit exposure of the AMF/MME component’s remote endpoints so that only authenticated sessions can invoke ran_ue_find_by_amf_ue_ngap_id.
  • Continuously monitor AMF/MME logs for unauthorized use of ran_ue_find_by_amf_ue_ngap_id and investigate any anomalies.

Generated by OpenCVE AI on May 17, 2026 at 11:21 UTC.

Tracking

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Advisories

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History

Sun, 17 May 2026 09:30:00 +0000

Type Values Removed Values Added
Description A vulnerability was found in Open5GS up to 2.7.6. This impacts the function ran_ue_find_by_amf_ue_ngap_id of the file src/amf/context.c of the component AMF/MME. Performing a manipulation results in improper authorization. It is possible to initiate the attack remotely. The exploit has been made public and could be used. The patch is named 5746b8576cfceec18ed87eb7d8cf11b1fb4cd8b1. It is suggested to install a patch to address this issue.
Title Open5GS AMF/MME context.c ran_ue_find_by_amf_ue_ngap_id improper authorization
First Time appeared Open5gs
Open5gs open5gs
Weaknesses CWE-266
CWE-285
CPEs cpe:2.3:a:open5gs:open5gs:*:*:*:*:*:*:*:*
Vendors & Products Open5gs
Open5gs open5gs
References
Metrics cvssV2_0

{'score': 6.5, 'vector': 'AV:N/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:OF/RC:C'}

cvssV3_0

{'score': 6.3, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C'}

cvssV3_1

{'score': 6.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C'}

cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P'}

Subscriptions

Open5gs Open5gs
cve-icon MITRE

Status: PUBLISHED

Assigner: VulDB

Published:

Updated: 2026-05-17T14:09:19.206Z

Reserved: 2026-05-16T12:38:24.093Z

Link: CVE-2026-8743

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-05-17T10:16:35.800

Modified: 2026-05-17T10:16:35.800

Link: CVE-2026-8743

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-17T11:30:15Z

Weaknesses