{"dataType": "CVE_RECORD", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2026-31165", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "dateUpdated": "2026-04-23T18:42:42.717Z", "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": "2026-04-23T17:34:36.764Z"}, "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 pppoeServiceName 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-service-name-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-service-name-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": "2026-04-23T18:40:52.269225Z", "id": "CVE-2026-31165", "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": "2026-04-23T18:42:42.717Z"}}]}, "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 pppoeServiceName parameter to /cgi-bin/cstecgi.cgi."}], "id": "CVE-2026-31165", "lastModified": "2026-04-24T15:12:56.600", "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": "2026-04-23T18:16:24.407", "references": [{"source": "cve@mitre.org", "tags": ["Exploit", "Third Party Advisory"], "url": "https://github.com/Svigo-o/TOTOLINK-Vul/tree/main/totolink-a3300r-pppoe-service-name-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-pppoe-service-name-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": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "n/a", "source": "cna", "vendor": "n/a"}, "product": "a3300r_firmware", "vendor": "totolink"}], "analysis": {"en": {"generated_at": "2026-04-28T07:45:40.357553+00:00", "value": {"mitigation_remediation": ["Deploy the latest firmware release from TOTOLINK that addresses command\u2011injection via the pppoeServiceName parameter.", "Restrict network access to the /cgi/cstecgi.cgi endpoint by configuring the device firewall or network ACLs to allow traffic only from trusted management hosts.", "Disable or restrict the pppoeServiceName parameter if the feature is not required, or apply input validation to sanitize the value before it is used in system commands."], "summary": {"action": "Patch Firmware", "impact": "Command Execution via HTTP CGI Parameter"}, "threat_synthesis": {"affected_systems": "ToToLink A3300R routers running firmware version 17.0.0cu.557_B20221024 are affected. The vulnerability is tied to the web\u2011based cstecgi.cgi CGI endpoint exposed on the device. No other ToToLink firmware versions are known to be impacted from the data given.", "description_and_impact": "The vulnerability resides in the ToToLink A3300R firmware and permits an attacker to inject arbitrary shell commands through the pppoeServiceName parameter sent to /cgi-bin/cstecgi.cgi. This flaw is a classic command\u2011injection weakness (CWE\u201177). If exploited, the attacker would gain the ability to run arbitrary system commands on the device, potentially compromising the device\u2019s confidentiality, integrity, and availability, and providing a foothold for further attacks on adjacent network equipment.", "risk_and_exploitability": "The CVSS score of 6.5 denotes moderate severity. The EPSS score of less than 1% suggests that, as of the last assessment, the probability of exploitation in the wild is low, and the vulnerability is not yet listed in CISA\u2019s KEV catalog. The likely attack vector is a remote HTTP request targeting the device\u2019s public interface, with the attacker controlling the pppoeServiceName value to steer command execution. The prerequisite is that the attacker can reach the device over the network, and no special privileges are required to send the request."}}}}, "created": "2026-04-27T20:20:56.096650+00:00", "title": "Command Injection via pppoeServiceName CGI on Totolink A3300R", "updated": "2026-04-28T08:00:14.320548+00:00", "vendors": ["totolink", "totolink$PRODUCT$a3300r_firmware"]}