{"dataType": "CVE_RECORD", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2026-31166", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "dateUpdated": "2026-04-23T19:05:04.109Z", "dateReserved": "2026-03-09T00:00:00.000Z", "datePublished": "2026-04-23T00:00:00.000Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2026-04-23T18:27:22.856Z"}, "descriptions": [{"lang": "en", "value": "An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbitrary commands via the hour parameter to /cgi-bin/cstecgi.cgi."}], "affected": [{"vendor": "n/a", "product": "n/a", "versions": [{"version": "n/a", "status": "affected"}]}], "references": [{"url": "https://github.com/Svigo-o/TOTOLINK-Vul/tree/main/totolink-a3300r-hour-cmd-injection"}], "problemTypes": [{"descriptions": [{"type": "text", "lang": "en", "description": "n/a"}]}]}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-77", "lang": "en", "description": "CWE-77 Improper Neutralization of Special Elements used in a Command ('Command Injection')"}]}], "references": [{"url": "https://github.com/Svigo-o/TOTOLINK-Vul/tree/main/totolink-a3300r-hour-cmd-injection", "tags": ["exploit"]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-04-23T19:04:30.293951Z", "id": "CVE-2026-31166", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-23T19:05:04.109Z"}}]}, "dataVersion": "5.2"}

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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:totolink:a3300r_firmware:17.0.0cu.557_b20221024:*:*:*:*:*:*:*", "matchCriteriaId": "DD39B647-3419-4C6D-A6A2-30F40822A27D", "vulnerable": true}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:h:totolink:a3300r:-:*:*:*:*:*:*:*", "matchCriteriaId": "7F723A73-4B32-4F9E-B5DA-80134D4711C1", "vulnerable": false}], "negate": false, "operator": "OR"}], "operator": "AND"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbitrary commands via the hour parameter to /cgi-bin/cstecgi.cgi."}], "id": "CVE-2026-31166", "lastModified": "2026-04-27T14:56:56.783", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 2.5, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2026-04-23T19:17:24.733", "references": [{"source": "cve@mitre.org", "tags": ["Exploit", "Third Party Advisory"], "url": "https://github.com/Svigo-o/TOTOLINK-Vul/tree/main/totolink-a3300r-hour-cmd-injection"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Third Party Advisory"], "url": "https://github.com/Svigo-o/TOTOLINK-Vul/tree/main/totolink-a3300r-hour-cmd-injection"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-77"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.0.0cu.557_B20221024"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "n/a", "source": "cna", "vendor": "n/a"}, "product": "a3300r_firmware", "vendor": "totolink"}], "analysis": {"en": {"generated_at": "2026-04-28T07:51:01.788362+00:00", "value": {"mitigation_remediation": ["Update the router firmware to a version where the /cgi-bin/cstecgi.cgi CGI no longer accepts the hour parameter unauthenticated or properly sanitises it.", "Restrict access to the router\u2019s management interface, e.g., configure the firewall to permit the /cgi-bin/cstecgi.cgi service only from trusted IP addresses or VPN connections.", "Disable or remove the /cgi-bin/cstecgi.cgi functionality if it is not required, and monitor the device for unexpected reboot or command execution patterns."], "summary": {"action": "Apply Patch", "impact": "Remote Command Execution"}, "threat_synthesis": {"affected_systems": "The affected system is the Totolink A3300R consumer router, running firmware 17.0.0cu.557_B20221024. The vulnerability is exposed through the web interface or the HTTP/HTTPS services that host the /cgi-bin/cstecgi.cgi script. Only this firmware version is currently listed as vulnerable; earlier or later builds may be unaffected.", "description_and_impact": "An attacker can supply a malicious value for the hour parameter in the /cgi-bin/cstecgi.cgi CGI endpoint on the Totolink A3300R router. The firmware v17.0.0cu.557_B20221024 fails to sanitise this input, so a crafted command is passed to the underlying shell, giving the attacker the ability to execute arbitrary commands on the device. This is a classic command injection flaw (CWE\u201177) that can compromise the confidentiality, integrity or availability of the router and any devices on its network.", "risk_and_exploitability": "The CVSS score of 6.5 indicates moderate severity. The EPSS score is below 1\u202f%, meaning that public exploitation is unlikely at present, and the vulnerability is not included in the CISA KEV catalog. Nevertheless, any attacker who can reach the affected router over the network \u2013 whether internally or from the internet \u2013 could exploit the flaw without authentication, potentially leading to full control of the device. The attack vector is inferred to be remote via the HTTP service, but the vulnerability would be easier to exploit if the router is exposed to untrusted networks."}}}}, "created": "2026-04-28T00:15:05.300258+00:00", "title": "Command Injection via Hour Parameter in Totolink A3300R Firmware", "updated": "2026-04-28T08:00:14.348613+00:00", "vendors": ["totolink", "totolink$PRODUCT$a3300r_firmware"]}