EUVD-2026-28959
GHSA-xm8g-256c-hjqj
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/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
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/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
2DescriptionCVE.org
A vulnerability has been found in Open5GS up to 2.7.7. Affected is the function pcf_nbsf_management_handle_register of the file src/pcf/nbsf-handler.c of the component sm-policies Endpoint. Such manipulation leads to denial of service. The attack may be performed from remote. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.
AnalysisAI
Remote denial of service in Open5GS up to version 2.7.7 affects the sm-policies endpoint's pcf_nbsf_management_handle_register function, allowing unauthenticated network attackers to trigger a crash or service disruption with low attack complexity. Publicly available exploit code exists and the vendor was notified early but has not released a fix.
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The vulnerability requires network connectivity to the Open5GS PCF sm-policies endpoint (default configuration typical on internal 5G core networks). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 5.5 with AV:N/AC:L/PR:N/UI:N indicates unauthenticated remote exploitation requiring minimal attacker effort against default configurations. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with network access to the PCF's sm-policies endpoint sends a crafted registration request that triggers improper resource handling in the pcf_nbsf_management_handle_register function, causing the PCF process to crash or enter a denial-of-service state. The low complexity and network accessibility mean the attack can be executed without authentication from any network segment that can reach the PCF service. |
| Remediation | Upgrade Open5GS to a version newer than 2.7.7 when available. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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