CVE-2026-1522

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This vulnerability affects the function sgwc_s5c_handle_modify_bearer_response of the file src/sgwc/s5c-handler.c of the component SGWC. Executing a manipulation can lead to denial of service. The attack can be launched remotely. The exploit has been made available to the public and could be used for attacks. This patch is called b19cf6a. Applying a patch is advised to resolve this issue. The issue report is flagged as already-fixed."}, {"lang": "es", "value": "Se ha identificado una debilidad en Open5GS hasta la versi\u00f3n 2.7.6. Esta vulnerabilidad afecta a la funci\u00f3n sgwc_s5c_handle_modify_bearer_response del archivo src/sgwc/s5c-handler.c del componente SGWC. La ejecuci\u00f3n de una manipulaci\u00f3n puede llevar a una denegaci\u00f3n de servicio. El ataque puede ser lanzado remotamente. El exploit ha sido puesto a disposici\u00f3n del p\u00fablico y podr\u00eda ser utilizado para ataques. Este parche se llama b19cf6a. Se aconseja aplicar un parche para resolver este problema. El informe del problema est\u00e1 marcado como ya solucionado."}], "id": "CVE-2026-1522", "lastModified": "2026-06-17T10:15:59.537", "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-2026-1522", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-01-28T16:41:46.515115Z", "version": "2.0.3"}}]}, "published": "2026-01-28T17:16:15.330", "references": [{"source": "cna@vuldb.com", "url": "https://github.com/open5gs/open5gs/"}, {"source": "cna@vuldb.com", "tags": ["Patch"], "url": "https://github.com/open5gs/open5gs/commit/b19cf6a"}, {"source": "cna@vuldb.com", "tags": ["Exploit", "Issue Tracking", "Patch", "Vendor Advisory"], "url": "https://github.com/open5gs/open5gs/issues/4266"}, {"source": "cna@vuldb.com", "tags": ["Exploit", "Issue Tracking", "Patch"], "url": "https://github.com/open5gs/open5gs/issues/4266#event-21968568116"}, {"source": "cna@vuldb.com", "tags": ["Exploit", "Issue Tracking", "Patch", "Vendor Advisory"], "url": "https://github.com/open5gs/open5gs/issues/4266#issue-3794991595"}, {"source": "cna@vuldb.com", "tags": ["Permissions Required", "VDB Entry"], "url": "https://vuldb.com/?ctiid.343193"}, {"source": "cna@vuldb.com", "tags": ["Third Party Advisory", "VDB Entry"], "url": "https://vuldb.com/?id.343193"}, {"source": "cna@vuldb.com", "tags": ["Exploit", "Third Party Advisory", "VDB Entry"], "url": "https://vuldb.com/?submit.738371"}], "sourceIdentifier": "cna@vuldb.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-404"}], "source": "cna@vuldb.com", "type": "Secondary"}]}

{}

{"analysis": {"en": {"generated_at": "2026-04-18T14:41:12.406232+00:00", "value": {"mitigation_remediation": ["Apply the public patch corresponding to commit b19cf6a to the Open5GS SGWC component.", "Deploy the patched SGWC binaries to all active SGWC nodes in the deployment.", "Restart SGWC services to ensure the patched code is in use."], "summary": {"action": "Apply Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "Products affected are Open5GS deployments using the SGWC module, specifically versions up to and including 2.7.6. The vulnerability pertains to the open-source SGWC component of Open5GS.", "description_and_impact": "The vulnerability is in the sgwc_s5c_handle_modify_bearer_response routine of Open5GS\u2019s SGWC component. A malformed Modify Bearer Response message enables a remote attacker to trigger a logic path that fails to properly release resources, resulting in a denial of service. The attacker need not obtain privileged credentials; the exploit operates over the network interface used for S5C signalling and is publicly available.", "risk_and_exploitability": "The CVSS score of 6.9 indicates a moderate severity. The EPSS value of less than one percent suggests a low likelihood of widespread exploitation, and the vulnerability is not tracked in the CISA KEV catalog. Nevertheless, the remote attack vector and availability impact mean that a service outage could be disruptive to subscriber connectivity. The fix is publicly available as commit b19cf6a."}}}}, "created": "2026-01-29T09:09:16.959571+00:00", "updated": "2026-04-18T14:45:03.147550+00:00", "vendors": ["open5gs", "open5gs$PRODUCT$open5gs"]}