CVE-2026-1521

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This affects the function sgwc_s5c_handle_bearer_resource_failure_indication of the file src/sgwc/s5c-handler.c of the component SGWC. Performing a manipulation results in denial of service. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks. The patch is named 69b53add90a9479d7960b822fc60601d659c328b. It is recommended to apply a patch to fix this issue."}, {"lang": "es", "value": "Una falla de seguridad ha sido descubierta en Open5GS hasta la versi\u00f3n 2.7.6. Esto afecta a la funci\u00f3n sgwc_s5c_handle_bearer_resource_failure_indication del archivo src/sgwc/s5c-handler.c del componente SGWC. Realizar una manipulaci\u00f3n resulta en denegaci\u00f3n de servicio. El ataque puede ser iniciado remotamente. El exploit ha sido publicado y puede ser utilizado para ataques. El parche se llama 69b53add90a9479d7960b822fc60601d659c328b. Se recomienda aplicar un parche para solucionar este problema."}], "id": "CVE-2026-1521", "lastModified": "2026-06-17T10:15:59.400", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "cna@vuldb.com", "type": "Secondary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "cna@vuldb.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "PROOF_OF_CONCEPT", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "cna@vuldb.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-1521", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-01-28T16:11:11.741434Z", "version": "2.0.3"}}]}, "published": "2026-01-28T15:16:17.493", "references": [{"source": "cna@vuldb.com", "url": "https://github.com/open5gs/open5gs/"}, {"source": "cna@vuldb.com", "tags": ["Patch"], "url": "https://github.com/open5gs/open5gs/commit/69b53add90a9479d7960b822fc60601d659c328b"}, {"source": "cna@vuldb.com", "tags": ["Exploit", "Issue Tracking", "Vendor Advisory"], "url": "https://github.com/open5gs/open5gs/issues/4268"}, {"source": "cna@vuldb.com", "tags": ["Exploit", "Issue Tracking", "Vendor Advisory"], "url": "https://github.com/open5gs/open5gs/issues/4268#event-21989483261"}, {"source": "cna@vuldb.com", "tags": ["Exploit", "Issue Tracking", "Vendor Advisory"], "url": "https://github.com/open5gs/open5gs/issues/4268#issue-3795012861"}, {"source": "cna@vuldb.com", "tags": ["Permissions Required", "VDB Entry"], "url": "https://vuldb.com/?ctiid.343192"}, {"source": "cna@vuldb.com", "tags": ["Third Party Advisory", "VDB Entry"], "url": "https://vuldb.com/?id.343192"}, {"source": "cna@vuldb.com", "tags": ["Exploit", "Third Party Advisory", "VDB Entry"], "url": "https://vuldb.com/?submit.738370"}], "sourceIdentifier": "cna@vuldb.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-404"}], "source": "cna@vuldb.com", "type": "Secondary"}]}

{}

{"analysis": {"en": {"generated_at": "2026-04-18T01:44:09.414629+00:00", "value": {"mitigation_remediation": ["Apply the official patch from commit 69b53add90a9479d7960b822fc60601d659c328b to your Open5GS installation.", "Upgrade to a version newer than 2.7.6 where the issue is fixed.", "Verify that SGWC services are only reachable from authorized networks and restrict unnecessary remote access."], "summary": {"action": "Immediate Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "Affected systems are Open5GS deployments running any version up to and including 2.7.6. The vulnerability is specific to the SGWC module, which manages control\u2011plane communication between the Serving Gateway and the MME. All standard releases within this range are vulnerable unless patched.", "description_and_impact": "This vulnerability resides in the SGWC component\u2019s sgwc_s5c_handle_bearer_resource_failure_indication function in Open5GS up to version 2.7.6. By sending a crafted Bearer Resource Failure Indication message, an attacker can trigger a denial of service that halts the SGWC process. The flaw can be initiated remotely and the exploit is publicly available, allowing a malicious actor to shut down Open5GS services and disrupt connectivity for connected eNodeBs and user equipment.", "risk_and_exploitability": "The CVSS score of 6.9 reflects a moderate severity denial of service. The EPSS score below 1% indicates a low likelihood of mass exploitation at present, and the vulnerability is not listed in CISA\u2019s KEV catalog. Nevertheless, the remote attack vector and public availability of the exploit mean that a network exposed to potential adversaries could be targeted. Because the flaw causes a process crash, affected systems will continue to be unavailable until a reboot or patch is applied, making it a high\u2011priority issue for mission\u2011critical environments."}}}}, "created": "2026-01-29T09:09:32.811742+00:00", "updated": "2026-04-18T01:45:33.405473+00:00", "vendors": ["open5gs", "open5gs$PRODUCT$open5gs"]}