EUVD-2026-26727Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
7DescriptionCVE.org
A vulnerability has been found in Open5GS up to 2.7.6. Affected is an unknown function of the file src/amf/gmm-handler.c of the component AMF. The manipulation of the argument reg_type leads to denial of service. The attack is possible to be carried out remotely. Upgrading to version 2.7.7 is able to address this issue. The identifier of the patch is ebc66942b6f8f1fab2d640e71cf4e9f1a423b426. It is advisable to upgrade the affected component.
AnalysisAI
Denial of service in Open5GS AMF (Access and Mobility Function) up to version 2.7.6 allows authenticated remote attackers to cause service unavailability by sending crafted registration requests with manipulated reg_type arguments. The vulnerability exists in the GMM (Mobility Management) handler due to insufficient validation of registration type values, potentially triggering null pointer dereferences or assertion failures. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Authentication required: attacker must have valid credentials or a compromised UE context to send NAS messages to the AMF (PR:L per CVSS). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/PR:L/UI:N/VA:L) indicates network-accessible denial of service requiring low-complexity authenticated access with low impact on availability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated attacker or compromised UE sends a 5G registration request (REGISTRATION REQUEST NAS message) to the AMF with a malformed or reserved registration_type value (e.g., reg_type=0 or other undefined encodings per 3GPP specs). The AMF's gmm_handle_registration_request() function in src/amf/gmm-handler.c fails to normalize this invalid value, causing it to be used in conditional logic without proper initialization checks. … |
| Remediation | Upgrade Open5GS to version 2.7.7 or later immediately, as vendor-released patch is available per https://github.com/open5gs/open5gs/releases/tag/v2.7.7. … Detailed patch versions, workarounds, and compensating controls in full report. |
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