EUVD-2026-27143Severity 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: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:L/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
3DescriptionCVE.org
A security flaw has been discovered in Open5GS up to 2.7.7. Affected is the function udm_nudr_dr_handle_subscription_authentication of the file /src/udm/nudr-handler.c of the component authentication-subscription Endpoint. Performing a manipulation results in denial of service. Remote exploitation of the attack is possible. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.
AnalysisAI
Denial of service in Open5GS up to version 2.7.7 affects the authentication-subscription endpoint handler, allowing authenticated remote attackers to manipulate the udm_nudr_dr_handle_subscription_authentication function and cause service unavailability. Public exploit code exists and the vulnerability has been reported to the project without a confirmed vendor response or patch release.
Technical ContextAI
Open5GS is an open-source 5G core network implementation. The vulnerability exists in the authentication-subscription endpoint handler located in /src/udm/nudr-handler.c, specifically within the udm_nudr_dr_handle_subscription_authentication function. CWE-404 (Improper Resource Validation) indicates that the function fails to properly validate or handle resources during the authentication-subscription process, leading to a condition that can be exploited to deny service. The UDM (Unified Data Management) component processes subscription authentication requests from other 5G network elements; improper validation of these requests allows attackers to trigger logic that exhausts resources or causes the service to become unresponsive.
RemediationAI
Upgrade Open5GS to a version beyond 2.7.7 once a patched release is available from the project. At present, no official patched version has been confirmed; monitor the Open5GS GitHub repository (https://github.com/open5gs/open5gs/) and the issue tracker (https://github.com/open5gs/open5gs/issues/4418) for patch availability. As an interim compensating control, restrict network access to the UDM authentication-subscription endpoint to trusted 5G core network elements only; implement authentication at the network perimeter or load balancer level to ensure only legitimate network function requests reach the vulnerable endpoint. Additionally, monitor UDM service logs and resource utilization for signs of manipulation attempts (unusual request patterns to the authentication-subscription endpoint) and implement alerting to detect exploitation. If the vulnerability is confirmed to affect production deployments, consider temporarily deploying a secondary UDM instance for redundancy to mitigate service unavailability impact during exploitation attempts.
open5gs v2.6.4 is vulnerable to Buffer Overflow. Rated critical severity (CVSS 9.8), this vulnerability is remotely expl
Open5GS v2.6.4 is vulnerable to Buffer Overflow. Rated critical severity (CVSS 9.8), this vulnerability is remotely expl
A request-validation issue was discovered in Open5GS 2.1.3 through 2.2.x before 2.2.1. Rated critical severity (CVSS 9.8
Open5GS 2.1.3 listens on 0.0.0.0:3000 and has a default password of 1423 for the admin account. Rated high severity (CVS
Open5GS MME versions <= 2.6.4 contain a reachable assertion in the `Uplink NAS Transport` packet handler. Rated high sev
Open5GS MME version <= 2.6.4 contains an assertion that can be remotely triggered via a malformed ASN.1 packet over the
Open5GS MME versions <= 2.6.4 contain an assertion that can be remotely triggered via a malformed ASN.1 packet over the
Open5GS MME versions <= 2.6.4 contains an assertion that can be remotely triggered via a malformed ASN.1 packet over the
Open5GS MME versions <= 2.6.4 contains an assertion that can be remotely triggered via a malformed ASN.1 packet over the
Open5GS MME versions <= 2.6.4 contain an assertion that can be remotely triggered via a malformed ASN.1 packet over the
Open5GS MME versions <= 2.6.4 contain an assertion that can be remotely triggered via a malformed ASN.1 packet over the
Open5GS MME versions <= 2.6.4 contains an assertion that can be remotely triggered via a malformed ASN.1 packet over the
Same weakness CWE-404 – Improper Resource Shutdown or Release
View allSame technique Denial Of Service
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External POC / Exploit Code
Leaving vuln.today