{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-7156", "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5", "state": "PUBLISHED", "assignerShortName": "VulDB", "dateReserved": "2026-04-26T20:08:17.839Z", "datePublished": "2026-04-27T20:30:20.851Z", "dateUpdated": "2026-04-28T14:10:58.745Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "1af790b2-7ee1-4545-860a-a788eba489b5", "shortName": "VulDB", "dateUpdated": "2026-04-27T20:30:20.851Z"}, "title": "Totolink A8000RU CGI cstecgi.cgi CsteSystem os command injection", "problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-78", "lang": "en", "description": "OS Command Injection"}]}, {"descriptions": [{"type": "CWE", "cweId": "CWE-77", "lang": "en", "description": "Command Injection"}]}], "affected": [{"vendor": "Totolink", "product": "A8000RU", "versions": [{"version": "7.1cu.643_b20200521", "status": "affected"}], "cpes": ["cpe:2.3:o:totolink:a8000ru_firmware:*:*:*:*:*:*:*:*"], "modules": ["CGI Handler"]}], "descriptions": [{"lang": "en", "value": "A vulnerability was detected in Totolink A8000RU 7.1cu.643_b20200521. Affected is the function CsteSystem of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument HTTP results in os command injection. The attack may be launched remotely. The exploit is now public and may be used."}], "metrics": [{"cvssV4_0": {"version": "4.0", "baseScore": 9.3, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P", "baseSeverity": "CRITICAL"}}, {"cvssV3_1": {"version": "3.1", "baseScore": 9.8, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R", "baseSeverity": "CRITICAL"}}, {"cvssV3_0": {"version": "3.0", "baseScore": 9.8, "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R", "baseSeverity": "CRITICAL"}}, {"cvssV2_0": {"version": "2.0", "baseScore": 10, "vectorString": "AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR"}}], "timeline": [{"time": "2026-04-26T00:00:00.000Z", "lang": "en", "value": "Advisory disclosed"}, {"time": "2026-04-26T02:00:00.000Z", "lang": "en", "value": "VulDB entry created"}, {"time": "2026-04-26T22:13:38.000Z", "lang": "en", "value": "VulDB entry last update"}], "credits": [{"lang": "en", "value": "LtzHuster2 (VulDB User)", "type": "reporter"}], "references": [{"url": "https://vuldb.com/vuln/359755", "name": "VDB-359755 | Totolink A8000RU CGI cstecgi.cgi CsteSystem os command injection", "tags": ["vdb-entry", "technical-description"]}, {"url": "https://vuldb.com/vuln/359755/cti", "name": "VDB-359755 | CTI Indicators (IOB, IOC, TTP, IOA)", "tags": ["signature", "permissions-required"]}, {"url": "https://vuldb.com/submit/801142", "name": "Submit #801142 | Totolink A8000RU 7.1cu.643_b20200521 Command Injection", "tags": ["third-party-advisory"]}, {"url": "https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_320/README.md", "tags": ["exploit"]}, {"url": "https://www.totolink.net/", "tags": ["product"]}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-04-28T14:07:49.860605Z", "id": "CVE-2026-7156", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-28T14:10:58.745Z"}}]}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability was detected in Totolink A8000RU 7.1cu.643_b20200521. Affected is the function CsteSystem of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument HTTP results in os command injection. The attack may be launched remotely. The exploit is now public and may be used."}], "id": "CVE-2026-7156", "lastModified": "2026-04-27T21:16:44.000", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "COMPLETE", "baseScore": 10.0, "confidentialityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "vectorString": "AV:N/AC:L/Au:N/C:C/I:C/A:C", "version": "2.0"}, "exploitabilityScore": 10.0, "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": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "cna@vuldb.com", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.9, "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": "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: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"}]}, "published": "2026-04-27T21:16:44.000", "references": [{"source": "cna@vuldb.com", "url": "https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_320/README.md"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/submit/801142"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/vuln/359755"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/vuln/359755/cti"}, {"source": "cna@vuldb.com", "url": "https://www.totolink.net/"}], "sourceIdentifier": "cna@vuldb.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-77"}, {"lang": "en", "value": "CWE-78"}], "source": "cna@vuldb.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.1cu.643_b20200521"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "A8000RU", "source": "cna", "vendor": "Totolink"}, "product": "a8000ru", "vendor": "totolink"}], "analysis": {"en": {"generated_at": "2026-04-28T12:51:25.590323+00:00", "value": {"mitigation_remediation": ["Update the router to the latest firmware that contains a patch for the cstecgi.cgi vulnerability.", "Restrict external exposure of the /cgi-bin/cstecgi.cgi endpoint by configuring firewall rules or access control lists to allow only trusted IP ranges.", "Disable or remove the cstecgi.cgi CGI module if it is not required for the router\u2019s normal operation.", "Harden router configuration, including disabling unnecessary services and ensuring management interfaces are isolated from the default network."], "summary": {"action": "Immediate Patch", "impact": "Remote Code Execution via OS Command Injection"}, "threat_synthesis": {"affected_systems": "The affected device is the Totolink A8000RU router running firmware version 7.1cu.643_b20200521. The flaw is present in the CGI handler component of the firmware, which can be accessed remotely over HTTP.", "description_and_impact": "The vulnerability arises from the CsteSystem function in the /cgi-bin/cstecgi.cgi CGI handler on Totolink A8000RU routers. By manipulating the HTTP argument, an attacker can cause the system to execute arbitrary operating system commands. This flaw is an instance of CWE-77 and CWE-78 and provides remote code execution capabilities.", "risk_and_exploitability": "The CVSS score of 9.3 indicates critical severity. With the exploit publicly available and no mitigation listed in KEV, attackers can readily target the device. The lack of an EPSS score means we cannot quantify precise exploitation probability, but the presence of a remote code execution vector and a public exploit suggests a high risk. Administrators should treat this as an urgent threat."}}}}, "created": "2026-04-28T00:15:05.298327+00:00", "updated": "2026-04-28T13:00:15.233691+00:00", "vendors": ["totolink", "totolink$PRODUCT$a8000ru"]}