CVE-2026-8743

Open5GS AMF/MME context.c ran_ue_find_by_amf_ue_ngap_id improper authorization

Assigner: VulDB
Reserved: 16.05.2026 Published: 17.05.2026 Updated: 17.05.2026

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.

Metrics

CVSS 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
CVSS Score: 5.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	None
Attack Complexity	Low	Integrity	Low	Integrity	None
Attack Requirements	None	Availability	Low	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

CVSS 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
CVSS Score: 6.3

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	Low
Privileges Required	Low	Integrity Impact	Low
User Interaction	None	Availability Impact	Low

CVSS 3.1

CVSS 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
CVSS Score: 6.3

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	Low
Privileges Required	Low	Integrity Impact	Low
User Interaction	None	Availability Impact	Low

CVSS 3.0

CVSS Vector: AV:N/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:OF/RC:C
CVSS Score: 6.5

Access Vector	Network	Confidentiality Impact	Partial
Access Complexity	Low	Integrity Impact	Partial
Authentication	Single	Availability Impact	Partial

CVSS 2.0

Product Status

Vendor	n/a
Product	Open5GS
Versions	Version 2.7.0 is affected Version 2.7.1 is affected Version 2.7.2 is affected Version 2.7.3 is affected Version 2.7.4 is affected Version 2.7.5 is affected Version 2.7.6 is affected

Vendor

n/a

Product

Open5GS

Versions

Version 2.7.0 is affected
Version 2.7.1 is affected
Version 2.7.2 is affected
Version 2.7.3 is affected
Version 2.7.4 is affected
Version 2.7.5 is affected
Version 2.7.6 is affected

Credits

Seungjoon Na (ICSR_KMU) finder
Jinha Kim (ICSR_KMU) finder
Seungjoon Na (VulDB User) reporter
Seungjoon Na (VulDB User) analyst

References

Problem Types