{"dataType": "CVE_RECORD", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2026-31164", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "dateUpdated": "2026-04-23T18:33:53.735Z", "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": "2026-04-23T17:31:34.974Z"}, "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 pppoeMtu 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-pppoe-mtu-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-pppoe-mtu-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": "2026-04-23T18:33:47.359102Z", "id": "CVE-2026-31164", "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": "2026-04-23T18:33:53.735Z"}}]}, "dataVersion": "5.2"}

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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.0.0cu.557_b20221024"}}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "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": "2026-04-28T20:38:03.801526+00:00", "value": {"mitigation_remediation": ["Update the router to the latest firmware that addresses this vulnerability.", "If a patch is not yet available, restrict access to the /cgi-bin/cstecgi.cgi endpoint to trusted networks only, using firewall rules or access\u2011control lists.", "Add input validation for the pppoeMtu parameter to accept only numeric values, rejecting any non\u2011numeric characters before processing."], "summary": {"action": "apply firmware update", "impact": "arbitrary command execution"}, "threat_synthesis": {"affected_systems": "ToToLink A3300R routers running firmware version 17.0.0cu.557_B20221024.", "description_and_impact": "The vulnerability is a command injection flaw (CWE\u201177) that allows an attacker to supply arbitrary shell commands through the pppoeMtu parameter of the /cgi-bin/cstecgi.cgi script on the ToToLink A3300R router. This flaw gives the attacker the ability to run commands with the privileges of the web service; it is inferred that this could compromise the device\u2019s operating system and the data it handles. The impact includes risks to confidentiality, integrity, and availability on the affected network segment.", "risk_and_exploitability": "The CVSS score of 6.5 indicates moderate severity and the EPSS score of <1% suggests a low current exploitation probability; the vulnerability is not listed in the CISA KEV catalog. The flaw exists in a web\u2011accessible script called /cgi-bin/cstecgi.cgi that accepts a pppoeMtu parameter. It is likely that a remote attacker with access to the router\u2019s HTTP interface could send a specially crafted request to that endpoint and, using the command injection weakness, execute supplied commands with the privileges of the web service."}}}}, "created": "2026-04-27T19:30:11.875495+00:00", "title": "Command Injection via PPPoE MTU Parameter in ToToLink A3300R Firmware", "updated": "2026-04-28T20:45:16.600377+00:00", "vendors": ["totolink", "totolink$PRODUCT$a3300r_firmware"]}