{"dataType": "CVE_RECORD", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2026-31027", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "dateUpdated": "2026-04-01T18:23:53.528Z", "dateReserved": "2026-03-09T00:00:00.000Z", "datePublished": "2026-04-01T00:00:00.000Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2026-04-01T15:37:35.338Z"}, "descriptions": [{"lang": "en", "value": "TOTOlink A3600R v5.9c.4959 contains a buffer overflow vulnerability in the setAppEasyWizardConfig interface of /lib/cste_modules/app.so. The vulnerability occurs because the rootSsid parameter is not properly validated for length, allowing remote attackers to trigger a buffer overflow, potentially leading to arbitrary code execution or denial of service."}], "affected": [{"vendor": "n/a", "product": "n/a", "versions": [{"version": "n/a", "status": "affected"}]}], "references": [{"url": "https://github.com/SunnyYANGyaya/cuicuishark-sheep-fishIOT/blob/main/ToTolink/A3600R/rootSsid-setAppEasyWizardConfig.md"}], "problemTypes": [{"descriptions": [{"type": "text", "lang": "en", "description": "n/a"}]}]}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-120", "lang": "en", "description": "CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-04-01T18:22:17.011067Z", "id": "CVE-2026-31027", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"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": "2026-04-01T18:23:53.528Z"}}]}, "dataVersion": "5.2"}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "TOTOlink A3600R v5.9c.4959 contains a buffer overflow vulnerability in the setAppEasyWizardConfig interface of /lib/cste_modules/app.so. The vulnerability occurs because the rootSsid parameter is not properly validated for length, allowing remote attackers to trigger a buffer overflow, potentially leading to arbitrary code execution or denial of service."}], "id": "CVE-2026-31027", "lastModified": "2026-04-03T16:11:11.357", "metrics": {"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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2026-04-01T16:23:49.787", "references": [{"source": "cve@mitre.org", "url": "https://github.com/SunnyYANGyaya/cuicuishark-sheep-fishIOT/blob/main/ToTolink/A3600R/rootSsid-setAppEasyWizardConfig.md"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-120"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.9c.4959"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "n/a", "source": "cna", "vendor": "n/a"}, "product": "a3600r", "vendor": "totolink"}], "analysis": {"en": {"generated_at": "2026-04-02T03:49:37.787720+00:00", "value": {"mitigation_remediation": ["Apply any vendor\u2011supplied firmware update that addresses the buffer overflow once it becomes available.", "If a patch is not yet released, block remote access to the setAppEasyWizardConfig endpoint using a firewall or network segmentation.", "If custom configuration scripts are used, validate the rootSsid input length before sending to the device.", "Monitor device logs for unexpected configuration changes or crash events to detect exploitation attempts."], "summary": {"action": "Immediate Patch", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "Devices manufactured by TOTOlink, specifically the A3600R router running firmware version 5.9c.4959, are affected. No other vendor or product combinations are listed as impacted.", "description_and_impact": "A buffer overflow condition exists in the setAppEasyWizardConfig interface of the A3600R firmware when the rootSsid parameter is supplied without proper length validation. The overflow can overwrite adjacent memory, enabling an attacker to execute arbitrary code or cause a denial of service. This weakness is characterized by the input validation flaw catalogued as CWE\u2011120.", "risk_and_exploitability": "The vulnerability is rated with a CVSS score of 9.8, indicating very high severity. EPSS data is not available, but the attack can be performed remotely via exposed configuration interfaces, suggesting it could be exploited in the wild. The vulnerability is not yet listed in CISA's KEV catalog. Attackers likely use crafted HTTP requests to inject an oversized rootSsid value, triggering the overflow and potentially gaining control of the device."}}}}, "created": "2026-04-02T07:51:15.525051+00:00", "title": "Buffer Overflow in A3600R Root SSID Configuration Enables Remote Code Execution", "updated": "2026-04-03T08:59:00.520478+00:00", "vendors": ["totolink", "totolink$PRODUCT$a3600r"]}