CVE-2026-5211

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This vulnerability affects the function UPnP_AV_Server_Path_Del of the file /cgi-bin/app_mgr.cgi. Executing a manipulation of the argument f_dir can lead to stack-based buffer overflow. The attack can be executed remotely. The exploit has been published and may be used."}, {"lang": "es", "value": "Se ha encontrado una falla en D-Link DNS-120, DNR-202L, DNS-315L, DNS-320, DNS-320L, DNS-320LW, DNS-321, DNR-322L, DNS-323, DNS-325, DNS-326, DNS-327L, DNR-326, DNS-340L, DNS-343, DNS-345, DNS-726-4, DNS-1100-4, DNS-1200-05 y DNS-1550-04 hasta 20260205. Esta vulnerabilidad afecta la funci\u00f3n UPnP_AV_Server_Path_Del del archivo /cgi-bin/app_mgr.cgi. La ejecuci\u00f3n de una manipulaci\u00f3n del argumento f_dir puede conducir a un desbordamiento de b\u00fafer basado en pila. El ataque puede ejecutarse de forma remota. El exploit ha sido publicado y puede ser utilizado."}], "id": "CVE-2026-5211", "lastModified": "2026-07-24T20:10:00.147", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "COMPLETE", "baseScore": 9.0, "confidentialityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "vectorString": "AV:N/AC:L/Au:S/C:C/I:C/A:C", "version": "2.0"}, "exploitabilityScore": 8.0, "impactScore": 10.0, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "cna@vuldb.com", "type": "Secondary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "cna@vuldb.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.4, "baseSeverity": "HIGH", "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": "LOW", "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:L/UI:N/VC:H/VI:H/VA:H/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": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "cna@vuldb.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-5211", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-01T12:28:53.734289Z", "version": "2.0.3"}}]}, "published": "2026-03-31T20:16:29.873", "references": [{"source": "cna@vuldb.com", "tags": ["Exploit", "Third Party Advisory"], "url": "https://github.com/wudipjq/my_vuln/blob/main/D-Link8/vuln_165/165.md"}, {"source": "cna@vuldb.com", "tags": ["Third Party Advisory", "VDB Entry"], "url": "https://vuldb.com/submit/780434"}, {"source": "cna@vuldb.com", "tags": ["Third Party Advisory", "VDB Entry"], "url": "https://vuldb.com/vuln/354347"}, {"source": "cna@vuldb.com", "tags": ["Permissions Required", "VDB Entry"], "url": "https://vuldb.com/vuln/354347/cti"}, {"source": "cna@vuldb.com", "tags": ["Product"], "url": "https://www.dlink.com/"}], "sourceIdentifier": "cna@vuldb.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-119"}, {"lang": "en", "value": "CWE-121"}], "source": "cna@vuldb.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "DNS-726-4", "source": "cna", "vendor": "D-Link"}, "product": "dns-726-4", "vendor": "d-link"}], "analysis": {"en": {"generated_at": "2026-04-02T23:52:32.175800+00:00", "value": {"mitigation_remediation": ["Apply the latest firmware update from D\u2011Link that addresses the stack\u2011overflow flaw.", "If no update is available, disable UPnP or block HTTP access to /cgi-bin/app_mgr.cgi to eliminate the attack surface.", "Restrict remote management to trusted networks, enforce strong authentication, and place the device behind a firewall or VLAN.", "Continuously monitor device logs and network traffic for indicators of exploitation attempts.", "Verify the integrity of the firmware after patching to ensure the update applied successfully."], "summary": {"action": "Immediate Patch", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "The flaw appears on a wide range of D\u2011Link networking products, including the DNS\u20111550\u201104, DNS\u20111100\u20114, DNS\u2011120, DNS\u20111200\u201105, DNS\u2011320, DNS\u2011320L, DNS\u2011320LW, DNS\u2011321, DNS\u2011323, DNS\u2011325, DNS\u2011326, DNS\u2011327L, DNS\u2011340L, DNS\u2011343, DNS\u2011345, DNS\u2011726\u20114, DNR\u2011202L, DNR\u2011322L, and DNR\u2011326 routers. Firmware builds up to and including the 20260205 release are vulnerable; newer builds are not indicated as affected.", "description_and_impact": "A stack\u2011based buffer overflow exists in the UPnP_AV_Server_Path_Del function of the /cgi-bin/app_mgr.cgi CGI script on several D\u2011Link routers. Manipulating the f_dir argument corrupts stack memory, allowing an attacker to execute arbitrary code on the device. The vulnerability is a classic example of buffer overflow (CWE\u2011119), stack corruption (CWE\u2011121), and out\u2011of\u2011bounds write (CWE\u2011787). Because the affected resource is reachable over HTTP, the exploit can be carried out remotely without prior local access.", "risk_and_exploitability": "The CVSS base score of 8.7 signals high severity, while an EPSS score of less than 1\u202f% indicates a low but non\u2011zero likelihood of exploitation in the wild. The vulnerability is not listed in the CISA KEV catalog, yet a publicly available exploit has already been released, raising practical risk for devices exposed to the internet. The attack vector is remote, requiring only the ability to send a crafted HTTP request to /cgi-bin/app_mgr.cgi; no additional preconditions are described."}}}}, "created": "2026-04-02T07:53:09.480055+00:00", "updated": "2026-04-03T09:19:23.751388+00:00", "vendors": ["d-link", "d-link$PRODUCT$dnr-202l", "d-link$PRODUCT$dnr-322l", "d-link$PRODUCT$dnr-326", "d-link$PRODUCT$dns-1100-4", "d-link$PRODUCT$dns-120", "d-link$PRODUCT$dns-1200-05", "d-link$PRODUCT$dns-1550-04", "d-link$PRODUCT$dns-315l", "d-link$PRODUCT$dns-320", "d-link$PRODUCT$dns-320l", "d-link$PRODUCT$dns-320lw", "d-link$PRODUCT$dns-321", "d-link$PRODUCT$dns-323", "d-link$PRODUCT$dns-325", "d-link$PRODUCT$dns-326", "d-link$PRODUCT$dns-327l", "d-link$PRODUCT$dns-340l", "d-link$PRODUCT$dns-343", "d-link$PRODUCT$dns-345", "d-link$PRODUCT$dns-726-4"]}