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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "1.0.0.3"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.As"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "F453", "source": "cna", "vendor": "Tenda"}, "product": "f453", "vendor": "tenda"}], "analysis": {"en": {"generated_at": "2026-04-16T04:21:33.019284+00:00", "value": {"mitigation_remediation": ["Upgrade the device to a firmware revision that includes the fix for the /goform/PPTPDClient buffer overflow.", "If an upgrade is not immediately possible, disable the PPTP service or block access to the /goform/PPTPDClient endpoint to prevent exploitation.", "Continue to monitor device logs for attempts to access the vulnerable endpoint or for unusually large username parameters and apply patching as soon as it becomes available."], "summary": {"action": "Immediate Patch", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "The problem is present in Tenda F453 models running firmware version 1.0.0.3/3.As, as identified through vendor/product identifiers and the matching CPE entries for the firmware. No other versions have been explicitly listed as affected.", "description_and_impact": "A stack-based buffer overflow exists in the Tenda F453 firmware in the function fromPptpUserAdd located within /goform/PPTPDClient. By supplying a crafted username or opttype parameter, an attacker can trigger the overflow and execute arbitrary code on the device. The vulnerability is a classic buffer overflow (CWE\u2011119, CWE\u2011121) and thus compromises the confidentiality, integrity, and availability of the affected device if successfully exploited.", "risk_and_exploitability": "The CVSS base score of 8.7 classifies this flaw as high severity, while the EPSS score of less than 1% indicates a low probability of exploitation at this time. The vulnerability can be triggered remotely through HTTP requests to the /goform/PPTPDClient endpoint. Publicly available exploits have been referenced, implying that the threat is real. The vulnerability is not currently listed in the CISA KEV catalog."}}}}, "created": "2026-03-09T10:03:18.611332+00:00", "updated": "2026-04-16T04:30:13.950129+00:00", "vendors": ["tenda", "tenda$PRODUCT$f453"]}